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Audi2007–2023 Critical issues documented

Audi A5: common faults & what to check

Thinking about buying a used Audi A5 (2007–2023) in New Zealand? We've documented 25 known faults for this model spanning engine, transmission, electrical, and cooling. Each researched and verified before it's published. The most serious issues here are rated critical. Every one is listed below with its symptoms and repair cost, and each has its own page with where to look and what to ask the seller. Free, no account needed.

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  • NZ owned and operated

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No NZ plate yet, or buying in Australia? Pick the generation and engine and start a free check below. New to KickTyres? How the check works →

25

Documented faults

Critical

Most serious

$600–$3,500

Typical repair

27

Service milestones

Which Audi A5 are you looking at?

4 generation variants documented. Pick the shape you recognise: the faults, the servicing and the timeline below all narrow to it. Free, no account needed.

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Which engine is in it? These cover every year of this model.

2.0 TFSI· 2.0 litre2.9 twin-turbo (RS5)· 2.9 litre, turbocharged3.0 V6 TFSI· 3.0 litre

Start your free check on this Audi A5

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Audi A5Engine not picked yet

Pick the engine above first: the A5 came with 3, and without it the report has to show all of their faults. Pick the engine

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Can't confirm for this car

Audi A5

Nothing has been narrowed yet, so nothing below is a claim about a particular car. Pick a year and an engine to see which faults apply.

Tell us the engine, or check the engine code on the car, before relying on this.

matched on no vehicle context

What to look out for

The checks worth doing on a Audi A5 before you hand over any money. Every documented fault is listed below, each with its own page.

  • Serious issue

    Road-test the vehicle through all gears including reverse while noting any hesitation, jerk, or failure to engage.

    See why

    S-Tronic DL501 Mechatronic Unit Failure

    The DL501 7-speed S-Tronic (code 0B5) was fitted to a wide range of longitudinal Audi models including the A5 8T from approximately 2008. Its integrated mechatronic unit combines shift solenoids, clutch pressure valves, and the TCU onto one assembly submerged in gearbox oil. Thermal cycling and contamination from clutch wear degrade the circuit board and solenoids over time. Failure modes range from harsh or erratic shifting to complete loss of drive or reverse, often appearing suddenly with no mechanical warning beforehand. The mechatronic is documented as the most frequent failure mode on the otherwise robust DL501 platform.

    What you would notice

    • Harsh or jerky gear changes — especially at low speed between 2nd and 3rd gear
    • Gearbox warning light accompanied by a flashing PRNDS display
    • Transmission limp mode — stuck in one gear or refusing to engage drive from standstill
    • No reverse gear or intermittent inability to select certain gears

    Typically $3,500–$7,500 to put right.

  • Serious issue

    Start the engine from a fully cold soak and listen for chain rattle from the front timing cover in the seconds before oil pressure builds.

    See why

    Timing chain tensioner failure (8T A5 2.0 TFSI EA888 CAEB/CDNC, built before May 2012)

    The EA888 2.0 TFSI in the A5 8T (CAEB and CDNC) carries the same hydraulic chain tensioner plastic-body design weakness present across all EA888 applications. The housing degrades under heat cycling, losing the ability to maintain chain tension after the engine has sat overnight. Repeated slack-chain startups advance guide and sprocket wear until the chain skips teeth, causing camshaft-to-crankshaft timing loss and valve-to-piston contact. Audi acknowledged the defect in a 2016 class action settlement covering multiple EA888 markets.

    What you would notice

    • Brief metallic rattle from the timing cover on a cold start, disappearing once oil pressure rises
    • OBD fault codes P0016 or P0017 (camshaft-crankshaft correlation errors)
    • Rough or stumbling cold idle lasting a few seconds
    • Intermittent check engine light with timing-system codes

    Typically $2,500–$5,500 to put right.

  • Serious issue

    Check for copper-coloured scoring or a missing wafer on the follower face.

    See why

    2.0 TFSI (EA113) High-Pressure Fuel Pump Cam Follower Wear

    The EA113 2.0 TFSI engine drives the high-pressure fuel pump via a cam lobe on the inlet camshaft acting on a small hardened follower (tappet). This follower wears through rapidly if oil changes are neglected or if the pump is left to run dry. Once the follower disintegrates, metal fragments enter the oil circuit and the cam lobe itself is destroyed, requiring camshaft and HPFP replacement. The fault is extensively documented across A4 B7/B8 and A5 B8 platforms sharing the EA113. If caught early (just follower replacement) cost is low; if the cam lobe is scored the repair escalates significantly.

    What you would notice

    • Loss of power and hesitation under load at higher rpm
    • P0087 or P0193 high fuel pressure fault codes
    • Rough running and engine stumble under acceleration
    • Metal debris visible in oil at service

    Typically $300–$4,800 to put right.

  • Serious issue

    Cold-start and listen carefully for chain rattle from the top of the engine before oil pressure builds.

    See why

    3.0 TDI Timing Chain Tensioner Failure

    The 3.0 V6 TDI (CASA/CCWA/CDUC) engines fitted to the A5 use a dual timing chain system with hydraulic tensioners. The upper timing chain tensioner is known to lose hydraulic pressure over time, particularly in engines with infrequent or degraded oil, causing chain stretch and the potential for the chain to skip or break. This is a shared failure mode with the VW Touareg and Audi Q7 3.0 TDI. Failure is catastrophic — chain jump causes piston-to-valve contact and full engine destruction. Several specialist workshops in NZ and AU report this as a known pre-purchase inspection item on all high-mileage 3.0 TDI VAG vehicles.

    What you would notice

    • Rattling from top of engine on cold start, particularly in winter
    • Camshaft correlation or timing chain fault codes (P0016, P0017, P0340)
    • Engine cuts out suddenly at idle or under load
    • Engine will not start after timing chain failure

    Typically $3,500–$8,000 to put right.

  • Serious issue

    Ask for Audi paperwork showing campaign 27H2 was done, or have an Audi dealer check the VIN for open recalls.

    See why

    Belt starter-alternator water entry and fire risk recall 27H2 (2.0 TFSI mild hybrid MHEV petrol, F5 A5, 2017-2020)

    On F5 A5 models with the 2.0 TFSI petrol engine and 12 volt mild hybrid (MHEV) system built from May 2017 to March 2020, moisture can get into a gap in the belt starter-alternator housing and make it overheat, with a risk of fire (Australian recall PRA 2020/18379, Audi campaign 27H2). The dealer fix is free. Cars without the mild hybrid system are not affected.

    What you would notice

    • Battery or charging warning light
    • Engine start/stop stops working
    • Burning smell from the engine bay

    Typically $0–$2,500 to put right.

  • Serious issue

    Ask for proof that the auxiliary coolant pump recall (REC-000020) has been completed, such as an Audi dealer invoice or service history entry.

    See why

    Electric auxiliary coolant pump overheating, fire-risk recall REC-000020 (A5 2.0 TFSI EA888 petrol)

    On the 8T A5 with the 2.0 TFSI EA888 turbo petrol, the electric auxiliary coolant pump can be blocked by debris from the cooling system or take in moisture and short circuit. The pump can then overheat and smoulder, and in some cases start a fire. Audi Australia recalled A4, A5, Q5, A6 and A7 models from 2011 to 2017 (REC-000020, PRA 2018/16842; US campaign 18V229) to replace the pump free of charge. Check the recall has been done.

    What you would notice

    • Coolant temperature warning
    • Burning or hot plastic smell from the engine bay after driving
    • Fan running on hard after the engine is switched off

    Typically $0–$900 to put right.

Audi A5 service schedule

What falls due, and at what distance, for each generation of the Audi A5. These are the model’s intervals — the car’s own service book is the only thing that can tell you what has actually been done to it.

Audi A5 Third Generation (B10) · 2024–2026 · 2.0L TFSI MHEV - S-Line Sport

Petrol

Due by distance

  1. 30,000 km

    Initial comprehensive inspection of suspension components and cabin air quality filters.

  2. 60,000 km

    Major milestone for S-tronic transmission fluid service and brake fluid flushing.

  3. 90,000 km

    Deep dive on spark plugs and advanced engine diagnostics to maintain peak TFSI efficiency.

Audi A5 Third Generation (B10) · 2024–2026 · 3.0L V6 TFSI - S5 Quattro Performance

Petrol

Due by distance

  1. 60,000 km

    Full transmission fluid service to maintain the crispness of the S-tronic gearbox.

  2. 80,000 km

    General suspension components, such as control arm bushings, should be inspected for wear.

  3. 100,000 km

    The water pump and thermostat housing are often suggested for preventative inspection during major services.

Audi A5 Second Generation (B9) · 2016–2024 · 2.0L TFSI - Sport trim

Petrol

Due by distance

  1. 60,000 km

    S-Tronic transmission fluid and filter service interval.

  2. 90,000 km

    Water pump and thermostat housing inspections are recommended here, to monitor for minor coolant weepage.

  3. 120,000 km

    Verify spark plug and ignition coil health to maintain peak engine efficiency.

Audi A5 Second Generation (B9) · 2016–2024 · 3.0L TDI - S-Line Quattro

Diesel

Due by distance

  1. 60,000 km

    First major transmission fluid and filter service, keeping the S-tronic shifting like new.

  2. 100,000 km

    Review the condition of the suspension components, particularly the upper control arm bushings and sway bar links.

  3. 120,000 km

    Have the diesel particulate filter (DPF) differential pressure sensors and EGR valve operation checked for carbon build-up.

Audi A5 First Generation (B8) · 2007–2016 · 1.8L TFSI - Entry level petrol

Petrol

Due by distance

  1. 100,000 km

    Evaluate the suspension bushings and verify the automatic transmission fluid's service history.

  2. 120,000 km

    Check the integrity of the PCV valve and coolant flange, which can become brittle over time.

  3. 150,000 km

    Thorough inspection of the turbocharger actuator and high-pressure fuel pump seals.

Audi A5 First Generation (B8) · 2007–2016 · 2.0L TFSI - Standard trim

Petrol

Due by distance

  1. 100,000 km

    Cooling system components like the water pump and thermostat housings may need inspection here.

  2. 120,000 km

    Check the PCV valve and watch for possible carbon build-up in the intake manifold.

  3. 150,000 km

    Shocks and struts may show natural fatigue here, typical for NZ road conditions.

Audi A5 First Generation (B8) · 2007–2016 · 3.0L TDI - Quattro Diesel

Diesel

Due by distance

  1. 100,000 km

    Full transmission service, including fluid and filter, to maintain shift quality.

  2. 150,000 km

    The DPF (Diesel Particulate Filter) system may need professional cleaning or inspection, depending on city versus highway driving.

  3. 200,000 km

    Struts and mounts may begin to show age, impacting handling precision.

Audi A5 First Generation (B8) · 2007–2012 · 4.2L FSI - S5 Performance trim

Petrol

Due by distance

  1. 100,000 km

    Cooling system components like the water pump and thermostat may show natural fatigue here.

  2. 120,000 km

    Verify whether the dual-clutch transmission service has been completed - vital for smooth operation.

  3. 150,000 km

    Shock absorbers or control arm bushings might need a refresh here for optimal handling.

Audi A5 First Generation (B8) · 2007–2012 · 3.2L FSI - V6 Performance trim

Petrol

Due by distance

  1. 100,000 km

    Suspension bushings and control arms may start to show fatigue on our NZ roads.

  2. 150,000 km

    Check the fuel injectors and decarbonise the intake valves - typical for direct-injection V6 engines.

  3. 200,000 km

    Ensure the transmission fluid has been serviced to maintain shift quality and torque converter longevity.

See all 25 documented issuesEverything researched for the Audi A5, including 7 rated critical.
Depends on which engine this Audi A5 has — 25Each of these is documented for one particular engine. Pick the year and engine above to see which of them apply.
Engine, transmission & cooling19

013.0 TDI Timing Chain Tensioner Failure

Cold-start and listen carefully for chain rattle from the top of the engine before oil pressure builds.diesel2007–2016Engine
OccasionalEngine $3,500–$8,000 to fix

Can't confirm for this car

The 3.0 V6 TDI (CASA/CCWA/CDUC) engines fitted to the A5 use a dual timing chain system with hydraulic tensioners. The upper timing chain tensioner is known to lose hydraulic pressure over time, particularly in engines with infrequent or degraded oil, causing chain stretch and the potential for the chain to skip or break. This is a shared failure mode with the VW Touareg and Audi Q7 3.0 TDI. Failure is catastrophic — chain jump causes piston-to-valve contact and full engine destruction. Several specialist workshops in NZ and AU report this as a known pre-purchase inspection item on all high-mileage 3.0 TDI VAG vehicles.

The front of a dual overhead camshaft engine with the timing cover removed, exposing the timing chain and sprockets.Example of the part — not this vehicle

The front of a twin-cam engine with the timing cover off — chain, sprockets and guides.

Logansenf · CC BY-SA 4.0 · Wikimedia Commons

Symptoms to notice

  • Rattling from top of engine on cold start, particularly in winter
  • Camshaft correlation or timing chain fault codes (P0016, P0017, P0340)
  • Engine cuts out suddenly at idle or under load
  • Engine will not start after timing chain failure

What to check

Cold-start and listen carefully for chain rattle from the top of the engine before oil pressure builds. Pull diagnostic codes for timing faults. Ask for documented oil service history — intervals longer than 12 months or 15,000 km significantly increase risk. Any 3.0 TDI over 150,000 km without documented timing chain service should be treated as high risk.

Where to look: Top of engine, timing chain cover at front of V6

Parts involved: Timing chain.

Ask the seller

  • “Has the timing chain or tensioner been replaced or inspected?”
  • “What oil change intervals has the car been maintained at?”
  • “Has the engine ever shown any warning lights or been diagnosed for timing issues?”

02S-Tronic DL501 Mechatronic Unit Failure

Road-test the vehicle through all gears including reverse while noting any hesitation, jerk, or failure to engage.2008–2016TransmissionRead the full fault: symptoms, where to look, what to ask the seller

03Timing chain tensioner failure (8T A5 2.0 TFSI EA888 CAEB/CDNC, built before May 2012)

Start the engine from a fully cold soak and listen for chain rattle from the front timing cover in the seconds before oil pressure builds.petrol2007–2013EngineRead the full fault: symptoms, where to look, what to ask the seller

042.0 TFSI (EA113) High-Pressure Fuel Pump Cam Follower Wear

Check for copper-coloured scoring or a missing wafer on the follower face.petrol2007–2016EngineRead the full fault: symptoms, where to look, what to ask the seller

05Electric auxiliary coolant pump overheating, fire-risk recall REC-000020 (A5 2.0 TFSI EA888 petrol)

Ask for proof that the auxiliary coolant pump recall (REC-000020) has been completed, such as an Audi dealer invoice or service history entry.petrol2012–2016Cooling
OccasionalCooling $0–$900 to fix

Can't confirm for this car

On the 8T A5 with the 2.0 TFSI EA888 turbo petrol, the electric auxiliary coolant pump can be blocked by debris from the cooling system or take in moisture and short circuit. The pump can then overheat and smoulder, and in some cases start a fire. Audi Australia recalled A4, A5, Q5, A6 and A7 models from 2011 to 2017 (REC-000020, PRA 2018/16842; US campaign 18V229) to replace the pump free of charge. Check the recall has been done.

Symptoms to notice

  • Coolant temperature warning
  • Burning or hot plastic smell from the engine bay after driving
  • Fan running on hard after the engine is switched off

What to check

Ask for proof that the auxiliary coolant pump recall (REC-000020) has been completed, such as an Audi dealer invoice or service history entry. With the bonnet open, use a torch to look for scorched plastic, melted wiring or coolant residue around the front of the engine, and smell for burning after the test drive. Watch the coolant temperature and warning lights on a 20 minute drive. If a workshop inspection is possible: have an Audi dealer check the VIN for open recalls and confirm the updated pump is fitted.

Where to look: Engine bay, front of the engine: the small electric auxiliary coolant pump and its wiring

Parts involved: Water pump.

Ask the seller

  • “Has the auxiliary coolant pump recall been done, and can I see the paperwork?”
  • “Has the car ever shown a coolant warning or overheated?”
  • “Is the car NZ-new or imported?”

062.0 TFSI EA888 Excessive Oil Consumption

Inspect the oil dipstick and confirm current level relative to last oil change date and distance.petrol2008–2012EngineRead the full fault: symptoms, where to look, what to ask the seller

07Multitronic CVT (01J) Variator Bearing and Chain Wear

Road test at highway speeds in light throttle — variator wear produces a distinct vibration band at certain speed ranges.petrol2007–2011Transmission
OccasionalTransmission $3,500–$9,000 to fix

Can't confirm for this car

Pre-2012 A5 B8 models with the automatic transmission option received the Multitronic 01J CVT rather than the S-tronic dual-clutch. The variator assembly (steel push-belt running between variable-diameter pulleys) develops bearing wear and belt slippage as mileage increases. Symptoms include a noticeable vibration through the drivetrain at certain speeds and loss of drive under load. The CVT is expensive to rebuild and Audi factory replacement units are very costly; specialist remanufacturers exist but the repair is a significant expense. Documented in Audi technical literature and owner forums.

Symptoms to notice

  • Vibration or shudder felt through the cabin at 60–100 km/h cruise
  • Judder under acceleration, particularly when cold
  • Slipping sensation — engine revs rise but vehicle speed does not increase proportionally
  • Transmission warning light with CVT ratio or variator fault codes

What to check

  1. Road test at highway speeds in light throttle — variator wear produces a distinct vibration band at certain speed ranges.
  2. Test hard acceleration from 40 km/h for slip.
  3. Check ATF fluid colour and condition (should be red, not brown).
  4. Ask for any previous transmission service or fluid change history.
  5. Avoid any example with a slipping sensation as this indicates advanced wear.

Where to look: Transmission tunnel, CVT unit beneath centre console

Parts involved: CVT belt and pulleys.

Ask the seller

  • “Has the Multitronic transmission fluid ever been changed?”
  • “Has the car ever shown a transmission warning light or hesitation under load?”
  • “Has any CVT repair or inspection been carried out?”

08S tronic dual-clutch rough shifting and hesitation

Drive it slowly and in traffic, because open-road driving flatters this gearbox and will tell you almost nothing.2017–2023TransmissionRead the full fault: symptoms, where to look, what to ask the seller

09Multitronic CVT judder and failure (front-wheel-drive cars)

Confirm whether the car is FWD (Multitronic) or quattro (not affected).2008–2016TransmissionRead the full fault: symptoms, where to look, what to ask the seller

103.2 FSI Valve Stem Seal Failure & Oil Burn

Check the oil dipstick and ask the owner how much oil is used between services — consumption exceeding 1 litre per 3,000 km indicates seal failure.petrol2007–2012Engine
CommonEngine $1,800–$4,500 to fix

Can't confirm for this car

Unconfirmed. This entry does not match our record of which engines and years this model was sold with, and is awaiting review. Confirm it against the car before acting on it.

The 3.2-litre FSI V6 (CALA) in the A5 8T shares the valve stem seal degradation documented across the 3.2 FSI engine family. Rubber seals harden and shrink with age and thermal cycling, allowing oil to pass down valve stems into the combustion chamber. As a direct-injection engine, no fuel is sprayed onto the intake valves, so oil deposits accumulate on the valve faces and ports without being washed away. Owners of higher-mileage A5 3.2 FSI vehicles typically report oil consumption of one litre or less per 2,000–3,000 km, with blue smoke most visible on a cold start.

Symptoms to notice

  • Blue smoke from the exhaust on cold start — especially after the car has sat overnight
  • Oil level dropping between service intervals without external leaks
  • Low oil pressure or level warning activating prematurely
  • Slight carbon smell from the engine bay or exhaust at idle

What to check

Check the oil dipstick and ask the owner how much oil is used between services — consumption exceeding 1 litre per 3,000 km indicates seal failure. Observe the exhaust immediately on cold start for blue smoke. A bore scope through the intake port can reveal carbon accumulation on intake valve faces. Inspect the rocker cover area for external oil seepage around the seals.

Where to look: Cylinder head valve guides and stem seal area on both banks of the V6

Ask the seller

  • “How much oil is added between service intervals?”
  • “Has blue smoke ever been noticed from the exhaust on startup?”
  • “Have the valve stem seals or PCV system been replaced?”

112.0 TDI DPF Premature Clogging

Check for EGR and differential pressure sensor fault codes that prevent regeneration.diesel2007–2016EngineRead the full fault: symptoms, where to look, what to ask the seller

123.0 V6 TDI (CAPA/CDUC/CLAB) Intake Manifold Swirl-Flap Motor and Linkage Failure — P2015 (8T)

diesel2008–2016EngineRead the full fault: symptoms, where to look, what to ask the seller

133.0 V6 TDI (CAPA/CDUC/CLAB) EGR Valve and Cooler Clogging — Insufficient Flow (8T)

diesel2008–2016EngineRead the full fault: symptoms, where to look, what to ask the seller

143.0 V6 TDI Injector Seal Blow-By — Chuffing Noise and Carbon Around Injectors (8T)

diesel2008–2016Engine
OccasionalEngine $400–$3,000 to fix

Can't confirm for this car

The copper sealing washers under the 3.0 TDI's injectors can let combustion gas escape past the injector seat — the classic diesel 'blow-by' fault owners describe as a rhythmic chuffing or ticking from the top of the engine, often with an exhaust smell reaching the cabin. Escaping gas bakes hard black carbon around the injector well, and the longer it runs the worse it gets: a caught-early case is new seals and seat cleaning, while a neglected one means seized injectors that fight removal and can multiply the bill. Audi owner forums document the failure and the repair on this exact engine.

A single common-rail diesel fuel injector photographed against a plain background.Example of the part — not this vehicle

A common-rail diesel injector. Contamination damages the nozzle at the tip.

Panoha · CC BY-SA 3.0 · Wikimedia Commons

Symptoms to notice

  • Rhythmic chuffing or ticking from the top of the engine, loudest when cold or under light load
  • Exhaust or burnt smell inside the cabin or at the bonnet
  • Hard black tar-like deposits around the injector area under the engine cover
  • Slight misfire or uneven idle in advanced cases

What to check

With the engine idling and the bonnet open, stand at the front and listen for a soft rhythmic chuff-chuff from the top of the engine — it sounds like a tiny air leak keeping time with the engine. Sniff for exhaust smell at the bonnet opening and in the cabin with the fan on fresh air. Ask the seller to lift the engine cover so you can shine your phone torch across the injector area: hard black crusty deposits around any injector are this fault in progress. Ask whether injector seals or washers have ever been replaced. If a workshop inspection is possible: have the injector wells inspected directly with the cover and insulation out of the way, and have any affected injector seats re-cut and resealed before deposits seize the injectors in place.

Where to look: Injector wells along the top of the V6 under the plastic engine cover

Parts involved: Fuel injector.

Ask the seller

  • “Have the injector seals or washers ever been replaced?”
  • “Is there ever an exhaust smell in the cabin?”
  • “Can you lift the engine cover so I can look across the injectors?”

15Water pump failure and coolant leak (8T A5 2.0 TFSI EA888 CAEB/CDNC)

With the engine cold, check the coolant reservoir level and use a phone torch to look for pink crust around the engine.petrol2009–2014Cooling
CommonCooling $800–$1,800 to fix

Can't confirm for this car

The 2.0 TFSI EA888 petrol (CAEB and CDNC) in the 8T A5 has a water pump that is prone to leaking and failing. In the USA a class action led Audi to extend the water pump warranty to 10 years or 100,000 miles on A5s from 2009 to 2014. That extension does not apply to NZ cars, so a failure here is at the owner's cost. Ignoring a leak risks overheating and head gasket damage.

Symptoms to notice

  • Low coolant warning light
  • Sweet coolant smell
  • Coolant drips or pink crust under the engine
  • Temperature gauge rising

What to check

With the engine cold, check the coolant reservoir level and use a phone torch to look for pink crust around the engine. Check the ground where the car is parked for drips. Ask whether the water pump has been replaced and when, and whether coolant needs topping up. If a workshop inspection is possible: a cooling system pressure test will confirm a pump leak.

Where to look: Water pump on the engine block, cooling system

Parts involved: Water pump.

Ask the seller

  • “Has the water pump been replaced?”
  • “Do you top up the coolant between services?”
  • “Has it ever overheated?”

16S tronic dual-clutch low-speed shudder / hesitation

Pull away gently several times and feel for shudder; try a slow crawl in traffic.petrol2017 onwardTransmission
OccasionalTransmission $400–$3,500 to fix

Can't confirm for this car

The F5 A5's 7-speed S tronic dual-clutch can develop a low-speed shudder and hesitant take-up as the clutch packs and mechatronic age, particularly on city-driven cars. It is generally more robust than the older dry-clutch DQ200, but a neglected gearbox that has never had a fluid service can jerk and, in bad cases, fault into limp mode.

Symptoms to notice

  • Shudder when moving off gently
  • Hesitation or a delayed 'catch' from a standstill
  • Occasional harsh downshift
  • Rare limp mode

What to check

  1. Pull away gently several times and feel for shudder; try a slow crawl in traffic.
  2. Confirm the S tronic fluid has been serviced on schedule.
  3. Any flashing gear display or limp-mode event needs investigating before purchase.

Where to look: Dual-clutch transmission / mechatronic

Parts involved: Clutch.

Ask the seller

  • “Has the S tronic fluid been serviced?”
  • “Does it shudder or hesitate pulling away?”

172.0 TFSI (EA888 Gen 3) water pump / thermostat module coolant leaks

Check the coolant level and look for pink/orange crust around the water pump area at the front of the engine.petrol2017 onwardCooling
CommonCooling $800–$1,800 to fix

Can't confirm for this car

The F5 A5's 2.0 TFSI uses an integrated plastic water-pump-and-thermostat module that develops coolant weeps as it ages. Left alone it causes slow coolant loss and can push temperatures up in traffic. It is a routine service item on the Gen 3 EA888 rather than a catastrophe, but replacement is not cheap because it is bundled with the thermostat.

An annotated photograph of an automotive engine thermostat identifying the wax capsule and both disc valves.Example of the part — not this vehicle

A double-valve engine thermostat, labelled: the wax capsule is what sticks.

Dougsim · CC BY-SA 3.0 · Wikimedia Commons

Symptoms to notice

  • Coolant smell after driving
  • Low coolant warning / regular topping up
  • Dried coolant residue on the block
  • Temperature creeping up in traffic

What to check

  1. Check the coolant level and look for pink/orange crust around the water pump area at the front of the engine.
  2. Ask if it needs topping up.
  3. A recent water pump invoice is a plus on a higher-km car.

Where to look: Integrated water pump / thermostat module on the front of the engine

Parts involved: Water pump, Thermostat.

Ask the seller

  • “Has the water pump/thermostat module been replaced?”
  • “Do you top up the coolant?”

18Direct-injection carbon build-up on intake valves (2.0/3.0 TFSI)

Ask whether the intake has ever been walnut-blasted, especially over 100,000 km.petrol2017 onwardEngine
CommonEngine $500–$1,200 to fix

Can't confirm for this car

Like all direct-injection Audis, the F5 A5's TFSI engines get no fuel washing over the back of the intake valves, so carbon accumulates there over time. By 80,000-120,000 km it can cause rough idle, misfires and a slight power loss, and the fix is a walnut-blast clean of the intake ports. It is expected maintenance on these engines rather than a defect, but buyers should budget for it.

Symptoms to notice

  • Rough or lumpy idle
  • Occasional misfire / flat spots
  • Slightly reduced power and economy
  • Cold-start stumble

What to check

Ask whether the intake has ever been walnut-blasted, especially over 100,000 km. On the test drive note any lumpy idle or hesitation. A misfire code on a scan is a clue.

Where to look: Intake valves / intake ports on the cylinder head

Ask the seller

  • “Has the intake ever been decarbonised / walnut-blasted?”
  • “Is the idle smooth from cold?”

19Recall: emissions defeat device software update (A5 2.0 TDI EA189 diesel)

The 2.0 TDI EA189 diesel in the 8T A5 was one of the engines fitted with the Volkswagen Group NOx emissions defeat software.diesel2008–2015Engine
OccasionalEngine $0 to fix

Can't confirm for this car

The 2.0 TDI EA189 diesel in the 8T A5 was one of the engines fitted with the Volkswagen Group NOx emissions defeat software. Audi recalled these cars for a software update so the engine meets its emissions approval; the 3.0 V6 TDI is not part of this recall. Ask whether the update was done; the recall is free at an Audi dealer.

Symptoms to notice

  • No symptoms before the update

What to check

Ask the seller for proof the emissions software recall has been done, such as an Audi dealer invoice or service book entry, and check whether the car is NZ-new or imported. On the test drive, watch for DPF or engine warning lights. If a workshop inspection is possible: have an Audi dealer check the VIN for open recalls.

Where to look: Engine control unit software (no physical part to see)

Ask the seller

  • “Has the EA189 emissions recall software update been done?”
  • “Has the DPF ever been replaced or cleaned?”
  • “Is the car NZ-new or imported?”
Electrical5

01Belt starter-alternator water entry and fire risk recall 27H2 (2.0 TFSI mild hybrid MHEV petrol, F5 A5, 2017-2020)

Ask for Audi paperwork showing campaign 27H2 was done, or have an Audi dealer check the VIN for open recalls.petrol2017–2020Electrical
OccasionalElectrical $0–$2,500 to fix

Can't confirm for this car

On F5 A5 models with the 2.0 TFSI petrol engine and 12 volt mild hybrid (MHEV) system built from May 2017 to March 2020, moisture can get into a gap in the belt starter-alternator housing and make it overheat, with a risk of fire (Australian recall PRA 2020/18379, Audi campaign 27H2). The dealer fix is free. Cars without the mild hybrid system are not affected.

Symptoms to notice

  • Battery or charging warning light
  • Engine start/stop stops working
  • Burning smell from the engine bay

What to check

Ask for Audi paperwork showing campaign 27H2 was done, or have an Audi dealer check the VIN for open recalls. With the bonnet open after a drive, sniff for a burning or electrical smell around the front of the engine, and check no charging or electrical warnings show on the dash. If a workshop inspection is possible: have the starter-alternator and its housing seal inspected and the fault memory read.

Where to look: Belt starter-alternator on the front of the 2.0 TFSI engine

Parts involved: Alternator, Starter motor.

Ask the seller

  • “Is this a 2.0 TFSI mild hybrid, and has recall 27H2 been done?”
  • “Has the charging or battery warning ever come on?”

02LED headlight seal failure — water sitting inside the lens

Look into both headlights properly and compare them with each other — this takes a minute and it is the whole check.2017–2019Electrical
OccasionalElectrical $800–$4,500 to fix

Can't confirm for this car

Failed seals let water into the LED headlight units, and it collects as visible droplets or a pool inside the lens. Early cars are the most affected. This is not the light misting up on a cold morning and clearing, which is normal — it is standing water that stays. It matters because an LED headlight is a sealed electronic assembly rather than a bulb in a housing: water gets to the LED modules and the driver electronics, and the usual outcome is a unit that fails and has to be replaced whole. On a car of this class that is a genuinely large bill for something that looks like a cosmetic complaint, which is exactly why it is worth looking at properly before you buy rather than mentioning it as an afterthought.

Symptoms to notice

  • Water droplets or a visible pool of water inside the headlight lens
  • Condensation that does not clear after driving with the lights on
  • Sections of the LED light not working, or dimmer than the other side
  • Flickering headlights, or a headlight warning message
  • Cloudy or stained appearance inside the lens

What to check

  1. Look into both headlights properly and compare them with each other — this takes a minute and it is the whole check.
  2. You are looking for standing water: droplets clinging to the inside of the lens, a tide mark, or a pool sitting at the bottom of the unit.
  3. Light misting that clears once the lights have been on is normal and is not this fault.
  4. Check both sides, because one usually goes before the other, and look for staining or cloudiness inside the lens that suggests water has been sitting there a while.
  5. Turn the headlights on, including the main beam and any daytime running or indicator elements, and walk round the front of the car checking that every segment lights evenly and matches the other side — a dark section or a dimmer patch means a module has already suffered.
  6. Watch the dash for any lighting warning.
  7. Ask whether either headlight has ever been replaced and whether the car has had front-end accident repair, which is another way seals get disturbed.
  8. If a workshop inspection is possible: ask for any stored lighting-system faults to be read.

Where to look: Front of the car — LED headlight units and their seals, both sides

Ask the seller

  • “Has either headlight ever had water inside it or been replaced?”
  • “Has the car had any front-end accident repair?”
  • “Does every part of both headlights light up evenly?”

03Emergency call (eCall) system activating on its own

2017–2023Electrical
OccasionalElectrical $400–$2,200 to fix

Can't confirm for this car

A5s from 2017 onwards have a documented fault where the emergency call system triggers by itself, caused by a failing control unit behind the SOS button. The car decides it has been in an accident when it has not, and either places the call or fills the dash with SOS warnings. It is more than an annoyance: an emergency call system that cries wolf is one nobody trusts, and a system stuck in a fault state may not work when it is genuinely needed. It also drains attention from the driver every time it fires. The good news for a buyer is that it is a defined fault with a known cause rather than a mystery electrical gremlin, so it can be diagnosed and quoted rather than chased.

Symptoms to notice

  • SOS or emergency call warning message appearing on the dash unprompted
  • The car placing or attempting an emergency call with no accident
  • SOS indicator light staying on, or flashing red
  • Emergency call system reported as unavailable
  • Warnings that clear on a restart and come back later

What to check

  1. Look up at the SOS button, usually in the overhead console, and check the indicator beside it: it should show the system as ready rather than red or flashing.
  2. Turn the ignition on and read every message on the dash and centre screen as they come up, including ones that appear briefly and clear — an SOS or emergency call message that flashes past is the symptom.
  3. Work through the vehicle settings menu to the emergency call or SOS section and check the system reports itself as available rather than faulted.
  4. Leave the car running through the whole viewing and watch for the message reappearing, since this fault is intermittent and a five-minute test drive may miss it entirely.
  5. Ask the seller directly whether the car has ever put up an SOS warning or made a call by itself — owners find this alarming and remember it clearly, so a straight question usually gets a straight answer.
  6. Ask whether the control unit has ever been replaced.
  7. If a workshop inspection is possible: ask for the stored control-unit faults to be read, which shows the history even when the car is behaving on the day.

Where to look: Overhead console — emergency call control unit behind the SOS button

Ask the seller

  • “Has the car ever shown an SOS warning or placed a call by itself?”
  • “Has the emergency call control unit ever been replaced?”
  • “Does the SOS indicator show the system as ready?”

04Air conditioning auxiliary heater element overheating recall 80C5 (8T A5, built April 2011 to May 2015)

Ask for proof that Audi campaign 80C5 (PRA 2018/16956) was done, or have an Audi dealer check the VIN for open recalls.2011–2015Electrical
RareElectrical $0–$800 to fix

Can't confirm for this car

The 8T A5 coupe, Sportback and cabriolet built from April 2011 to May 2015 (all engines) was recalled in Australia because the electric auxiliary heater element in the heating and air conditioning unit can overheat where it connects, with a risk of smouldering or fire (PRA 2018/16956, Audi campaign 80C5). The repair is free at an Audi dealer. Whether a particular car is affected is decided by its VIN.

Symptoms to notice

  • Burning or hot plastic smell from the vents
  • Heater blowing cold or fan acting up
  • Fuse for the heater blowing

What to check

Ask for proof that Audi campaign 80C5 (PRA 2018/16956) was done, or have an Audi dealer check the VIN for open recalls. With the engine running, set the heater to full hot and sniff the vents for a burning or hot plastic smell, and check warm air arrives quickly. If a workshop inspection is possible: have the dealer confirm the heater element and connector were replaced or checked under the campaign.

Where to look: Electric auxiliary heater element inside the heater and air conditioning box behind the dash

Ask the seller

  • “Has Audi campaign 80C5 for the heater element been done?”
  • “Have you ever smelt burning from the vents?”

05Seat belt warning may not sound continuously, software recall REC-001650 (F5 A5, 2018-2021)

Ask for proof that Audi campaign 90P5 was done or have an Audi dealer check the VIN.2018–2021Electrical
CommonElectrical $0–$200 to fix

Can't confirm for this car

2018 to 2021 F5 A5 models (all engines) were recalled in Australia because the unbuckled seat belt warning may only sound now and then instead of continuously, so an unbelted occupant can go unnoticed (REC-001650, Audi campaign 90P5). The fix is a free software update at an Audi dealer.

Symptoms to notice

  • Seat belt chime stops or comes and goes while a front belt is unbuckled

What to check

Ask for proof that Audi campaign 90P5 was done or have an Audi dealer check the VIN. During the test drive, with a passenger seated and their belt left unbuckled for a moment at low speed in a safe place, check the warning stays on continuously. If a workshop inspection is possible: have the dealer confirm the control unit software is at the recall level.

Where to look: Instrument cluster and seat belt warning software

Ask the seller

  • “Has the seat belt warning software recall been done?”
Body, brakes, suspension & interior1

01Rear axle nuts may break, recall REC-001665 and follow-up REC-005076 (F5 A5, 2019-2021, check VIN)

Ask for Audi paperwork showing campaigns 42L1 and 42L5 were done, or have an Audi dealer check the VIN for open recalls.2019–2021Suspension
OccasionalSuspension $0–$600 to fix

Can't confirm for this car

On 2019 to 2021 F5 A5 models (all engines) the nuts that clamp the rear axle assembly may not meet specification and can break, which can let the rear axle move suddenly (Australian recall REC-001665, Audi campaign 42L1). A follow-up recall (REC-005076, campaign 42L5) checks rear axle alignment on cars whose nuts were replaced, because misalignment can cause fast tyre wear and sudden flat tyres. Both are free at an Audi dealer.

Symptoms to notice

  • Clunk or knock from the rear over bumps
  • Car pulls or the rear feels loose
  • Uneven or very fast wear on the inside of the rear tyres

What to check

  1. Ask for Audi paperwork showing campaigns 42L1 and 42L5 were done, or have an Audi dealer check the VIN for open recalls.
  2. Look at the rear tyres for wear on the inner edges, and on the test drive listen for knocks from the rear and check the car tracks straight.
  3. If a workshop inspection is possible: have the rear axle clamping nuts inspected and a four wheel alignment check done.

Where to look: Rear axle assembly and its clamping nuts under the back of the car

Ask the seller

  • “Have the rear axle nut recall and the follow-up alignment recall both been done?”
  • “Have the rear tyres worn out unusually fast?”

Audi A5 faults in detail

Each of these has its own page: the symptoms, where to look, what to ask the seller and what the repair costs. Free, no account needed.

2.0 TDI DPF Premature CloggingMajor · Engine2.0 TFSI (EA113) High-Pressure Fuel Pump Cam Follower WearCritical · Engine2.0 TFSI EA888 Excessive Oil ConsumptionMajor · Engine3.0 V6 TDI (CAPA/CDUC/CLAB) EGR Valve and Cooler Clogging — Insufficient Flow (8T)Major · Engine3.0 V6 TDI (CAPA/CDUC/CLAB) Intake Manifold Swirl-Flap Motor and Linkage Failure — P2015 (8T)Major · EngineMultitronic CVT judder and failure (front-wheel-drive cars)Major · TransmissionS tronic dual-clutch rough shifting and hesitationMajor · TransmissionS-Tronic DL501 Mechatronic Unit FailureCritical · TransmissionTiming chain tensioner failure (8T A5 2.0 TFSI EA888 CAEB/CDNC, built before May 2012)Critical · Engine

What these repairs cost on other cars

Some of the Audi A5’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Other Audi models

Audi A445 documented faultsAudi A343 documented faultsAudi A634 documented faultsAudi Q520 documented faultsAudi S318 documented faultsAudi TT17 documented faults

Audi A5 buyer questions

Is the Audi A5 reliable?

Like any used car, it depends on the specific example and its service history. Across the 25 documented faults for the Audi A5, the recurring problem areas are engine, transmission, and electrical. A Audi A5 with a full service history and no signs of the issues listed on this page can be a sound buy but each one needs to be checked individually before you commit.

What are the most common problems with a used Audi A5?

We've catalogued 25 known faults for the Audi A5, covering engine, transmission, and electrical. All 25 are written out in full on this page, with the symptoms to notice, what to inspect, and typical repair costs for each. Free to read, no account needed.

How much do repairs cost on a Audi A5?

Most single repairs on the Audi A5 fall between $600–$3,500 at NZ independent-workshop rates. Some of the 25 documented faults cost less and a few cost considerably more, and no one car needs them all. Knowing which ones to look for before you view is what lets you negotiate the price down or walk away.

Should I get a pre-purchase inspection on a Audi A5?

Yes. A Audi A5 inspection focused on its known weak points is the single best way to avoid an expensive mistake. KickTyres gives you a guided, model-specific inspection plus a market valuation and negotiation figure for $24.90 far less than the cost of missing one of the faults on this page.