Audi2002–2017 Critical issues documented

Audi A8 D5: common faults & what to check

The D5 is the Audi A8 built 2017 onward. Of the 7 faults documented for the A8, 3 apply to this generation, each with its symptoms, what to inspect and a typical repair cost. Free, no account needed.

Check this exact Audi A8

Odometer history
Money owing
Reported stolen
Ownership history

Official NZ vehicle register data
NZ owned and operated

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Documented faults

Critical

Most serious

$1,600–$8,000

Typical repair

Service milestones

You're looking at the D5

Everything below is narrowed to this variant. Pick a different one to change it.

2017–nowD5 Selected2017–nowD5Engine not documented for this generationEngine not documentedDocumented issues3 knownSee faults & what to checkPhoto: Vauxford via Wikimedia Commons, CC BY-SA 4.0.

Choose a different generation

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.

3.0L V6 TFSI· 3.0 litre 3.0L V6 TDI· 3.0 litre 4.0L V8 TFSI· 4.0 litre 4.2L V8 TDI· 4.2 litre

A 2019 Audi A8 is the D5 generation (2017 to now).

We cannot narrow the engine list to this year, so every engine this model was sold with is offered.

Start your free check on this Audi A8

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

Audi A8 D5Engine not picked yet

Pick the engine above first: the A8 came with 4, and without it the report has to show all of their faults. Pick the engine

Can't confirm for this car

Audi A8 · 2019

Narrowed to the year. No engine is recorded for this vehicle. Pick an engine to see which faults apply.

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

No engine is recorded for this vehicle.

matched on year only

What to look out for

The checks worth doing on a Audi A8 before you hand over any money. Every documented fault is listed below, each with its own page.

Serious issue
Check ride height at all four corners when cold — any low corner indicates a failed strut.
See why
Air Suspension Strut Failure and Compressor Burn-Out
All D3, D4, and D5 Audi A8 models use Audi Adaptive Air Suspension as standard across all four corners. Air spring bladders degrade from ozone cracking, UV exposure, and heat cycling — D3 cars (2002-2009) are now 17-24 years old in the NZ/AU market, making strut failure essentially expected. The air compressor overworks to maintain pressure against leaking struts and burns out within months of first strut failure. D4 compressor failure is particularly well-documented due to the compressor being in an enclosed location with poor ventilation. A car sitting on its bump stops fails WOF in NZ/AU. Coilover conversion is a common but ride-quality-compromising workaround seen frequently at the price point these cars trade at.
What you would notice
- Vehicle sitting lower than normal at one or more corners
- Suspension fault or 'raise vehicle' warning on MMI display
- Air compressor audible cycling repeatedly after startup
- Harsh, undamped ride quality with no height adjustment response
- Visible lean or tilt when parked on level ground
Typically $1,400–$8,000 to put right.

Audi A8 service schedule

The 3 engines a 2019 Audi A8 was sold with, each with its own intervals. Pick your engine above to narrow this to one. 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 A8 D5 · 2018–2026 · 55 TFSI 3.0L V6 - Mild Hybrid Luxury

Petrol

Due by distance

60,000 km
Proactive transmission fluid flush to keep the Tiptronic gearbox smooth.
80,000 km
Inspect all air suspension struts and compressor health as part of your routine check-up.
100,000 km
Major service interval: professionally assess spark plugs, belt components and coolant condition.

Audi A8 D5 · 2018–2026 · 50 TDI 3.0L V6 - Mild Hybrid Quattro

Diesel

Due by distance

60,000 km
Major service including a transmission fluid flush to maintain long-term smoothness.
90,000 km
Inspect the cooling system components and water pump integrity.
120,000 km
Thorough inspection of the mild-hybrid system battery health and associated electronic connections.

Audi A8 D5 · 2018–2026 · 60 TFSI 4.0L V8 - Performance Quattro

Petrol

Due by distance

60,000 km
Major service including spark plugs and a transmission fluid flush.
80,000 km
Inspect suspension bushings and control arms for wear.
100,000 km
Evaluate the turbocharger cooling lines and consider carbon cleaning for the direct-injection system.

See all 3 issues for this oneDocumented for the exact year and engine you picked, including 1 rated critical.

Body, brakes, suspension & interior1 critical1

01Air Suspension Strut Failure and Compressor Burn-Out

Check ride height at all four corners when cold — any low corner indicates a failed strut.2002 onwardSuspension$1,400–$8,000Read the full fault: symptoms, where to look, what to ask the seller

Depends on the exact engine — 2 moreDocumented for a specific engine we could not confirm from what you picked. Check the engine code on the car.

Engine, transmission & cooling1

01ZF 8HP Transmission Solenoid Pack and Valve Body Wear

Test drive in slow city traffic (exercising 1-3 gears) and at steady highway speed — any harsh upshift, hesitation, or gear hunting is a flag.2009 onwardTransmissionCan't confirm for this car$1,600–$8,500

OccasionalTransmission $1,600–$8,500 to fix

Can't confirm for this car

The ZF 8HP automatic transmission fitted to D4 and D5 Audi A8 is documented for solenoid pack and valve body bore wear, particularly in vehicles that have never had transmission fluid changed — Audi marketed the unit as sealed-for-life. Degraded fluid causes solenoid sluggishness and bore wear in the valve body, resulting in harsh engagement, delayed shifts, and stored fault codes. This fault pattern is shared across all VAG/BMW/Jaguar Land Rover applications of the ZF 8HP and is well-documented to independent transmission specialists in NZ/AU.

Symptoms to notice

Harsh or jerky 1-2 or 2-3 upshifts
Delayed engagement from Drive or Reverse
Transmission warning light on MMI display
Fault codes in P0750-P0770 range (solenoid circuit)
Hunting between gears at steady cruise

What to check

Test drive in slow city traffic (exercising 1-3 gears) and at steady highway speed — any harsh upshift, hesitation, or gear hunting is a flag.
Scan for transmission codes.
Review service history for any fluid change record.
Ask specifically whether transmission fluid has been changed at any mileage point.

Where to look: ZF 8HP automatic transmission — valve body, solenoid pack, and sump

Parts involved: Mechatronic / valve body.

Ask the seller

“Has the transmission fluid ever been changed or inspected?”
“Have there been any harsh shift or delayed engagement complaints?”
“Are there stored transmission fault codes?”
“Has any transmission or valve body repair been completed?”

Electrical1

01D5 Mild-Hybrid BSG (Belt-Starter-Generator) Failure

Scan for 48V system fault codes using VCDS or ODIS.hybrid2017 onwardElectricalCan't confirm for this car$2,500–$9,500

OccasionalElectrical $2,500–$9,500 to fix

Can't confirm for this car

The D5 A8 (2017-present) with the 3.0 TFSI engine uses Audi's 48V mild-hybrid system with a Belt-Starter-Generator replacing the conventional alternator and starter motor. The BSG is driven by a dedicated belt and integrates with a 10Ah lithium-ion buffer battery and a DC/DC converter linking 48V and 12V systems. Failures are documented from the BSG unit itself (bearing and winding wear), the 48V lithium buffer battery (cell degradation), and the DC/DC converter. Failure modes range from loss of mild-hybrid assist (cosmetic at first) to inability to restart the engine in emergency mode. Belt-driven units see accelerated wear in high-cycle city stop-start use. This is an emerging documented pattern given the D5's relative youth.

Symptoms to notice

Mild-hybrid system warning or deactivation message on MMI
Battery or charging system fault on dashboard
12V battery repeatedly discharging unexpectedly
Audible conventional starter engagement on startup (BSG normally starts the engine silently)
Loss of engine-off coasting or regenerative braking capability

What to check

Scan for 48V system fault codes using VCDS or ODIS.
Note whether the car starts silently (BSG operating) or with audible starter motor engagement (BSG fault mode).
Inspect the 48V belt for wear or contamination.
If a workshop inspection is possible: Check 10Ah buffer battery condition and cycle count via diagnostic tool.

Where to look: Front of engine (BSG on auxiliary belt drive), 48V lithium buffer battery (boot area), DC/DC converter (engine bay)

Parts involved: Starter motor.

Ask the seller

“Has the mild-hybrid system produced any warning messages?”
“Has the BSG unit, 48V battery, or DC/DC converter been replaced?”
“Does the car start silently or with audible starter motor engagement?”
“Has the 48V belt been inspected or replaced?”

Other Audi A8 engines and years4 documented issues that do not apply to the one you picked.

Engine, transmission & cooling3

014.0 TFSI V8 Timing Chain Tensioner Failure

Cold-start the engine and listen for chain rattle from either side.petrol2017EngineDoes not apply$5,500–$16,000

OccasionalEngine $5,500–$16,000 to fix

Does not apply

The 4.0-litre twin-turbo TFSI V8 (CZAC and related codes) in the D5 A8 is documented for timing chain tensioner failure, sharing the pattern seen across the broader VW/Audi 4.0 TFSI engine family (also found in the Bentley Bentayga and Lamborghini Urus). The engine has two timing chains (one per bank) with hydraulic tensioners that can fail under extended oil change intervals or at higher mileages. Tensioner failure results in chain slack and cold-start rattle — if a chain jumps a tooth, catastrophic valve-to-piston contact results. This is less common than on the 3.0 TDI but is documented on high-mileage D5 examples and vehicles on extended service intervals.

Symptoms to notice

Cold-start timing chain rattle from one or both cylinder banks
Check engine light with camshaft correlation codes (P0016, P0017 range)
Rough running on cold start settling after warm-up
In advanced cases: misfires and loss of power under load

What to check

Cold-start the engine and listen for chain rattle from either side. Scan for camshaft timing or correlation fault codes. Review service records for oil change compliance — any interval over 10,000 km is elevated risk on this engine. If a workshop inspection is possible: The repair requires significant disassembly from both sides of the engine.

Where to look: Inside the engine — dual timing chains (one per cylinder bank), hydraulic tensioners and plastic guides, accessible from front timing covers

Parts involved: Timing chain.

Ask the seller

“Has the vehicle always had oil changes within the recommended interval?”
“Has the engine ever produced a cold-start rattle from either bank?”
“Have timing chain tensioners or guides been inspected or replaced?”
“Are there stored camshaft timing correlation fault codes?”

023.0 TDI V6 Timing Chain Tensioner Failure

Cold-start the engine and listen carefully for chain rattle from the front — any rattle that disappears after 20-40 seconds is a strong indicator.diesel2002–2017EngineDoes not apply$2,800–$7,500Read the full fault: symptoms, where to look, what to ask the seller

034.2 FSI V8 Cam Follower and HPFP Drive Wear

Ask to see evidence of cam follower inspection records — this is a standard check item on any informed Audi specialist service.petrol2002–2017EngineDoes not apply$350–$6,500Read the full fault: symptoms, where to look, what to ask the seller

Fluid leaks1

01Quattro Centre Differential Output Shaft Seal Leak

Clean the area and recheck at a second inspection if unclear.2002–2009Fluid LeaksDoes not apply$600–$3,500

OccasionalFluid Leaks $600–$3,500 to fix

Does not apply

D3 A8 models with Quattro permanent all-wheel drive (Torsen centre differential) are documented for oil seal failure on the centre differential output shafts. The seals degrade from heat cycling and age, causing ATF or gear oil to leak onto the driveshafts, subframe, and surrounding components. Left unaddressed, the differential runs low on lubricant and can suffer bearing or gear damage — escalating a seal repair into a differential rebuild. The leak is commonly missed during casual inspection as the drivetrain underside is complex and the leak origin is obscured by accumulated road grime on older cars.

Symptoms to notice

Oil weeping or dripping from centre differential area on underside
ATF or gear oil smell from beneath the vehicle after driving
Oily residue on driveshafts or transmission tunnel underside
Low differential or gearbox fluid level noted at service

What to check

Clean the area and recheck at a second inspection if unclear.
Check gearbox and transfer case fluid levels at dipstick or fill plug.
If a workshop inspection is possible: Inspect the underside on a hoist — look for fresh oil at the centre differential output shaft flanges and any tracking down the propshaft.

Where to look: Centre of vehicle underside — Torsen centre differential output shaft seals and front differential housing

Parts involved: Differential.

Ask the seller

“Has any differential or drivetrain seal work been performed?”
“Is there any evidence of oil leaks from the driveline under inspection?”
“Have the gearbox and differential fluid levels been checked recently?”
“Has the vehicle been used in conditions that may have accelerated seal wear?”

Audi A8 faults in detail

Narrowed to the Audi A8 · 2019. 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.

Air Suspension Strut Failure and Compressor Burn-OutCritical · Suspension

What these repairs cost on other cars

Some of the Audi A8’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

Timing Chain Replacement Cost

Other Audi models

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Audi A8 buyer questions

Is the Audi A8 reliable?

Like any used car, it depends on the specific example and its service history. Across the 7 documented faults for the Audi A8, the recurring problem areas are engine, suspension, and electrical. A Audi A8 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 A8?

We've catalogued 7 known faults for the Audi A8, covering engine, suspension, and electrical. All 7 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 A8?

Most single repairs on the Audi A8 fall between $1,600–$8,000 at NZ independent-workshop rates. Some of the 7 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 A8?

Yes. A Audi A8 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.