Audi Q7: common faults & what to check

Which Audi Q7 are you looking at?

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

Petrol

1 variant documented

2006–20154L2006–20154L4.2 V8 petrolPetrolDocumented issues5 knownSee faults & what to checkPhoto: Vauxford via Wikimedia Commons, CC BY-SA 4.0.

Diesel

1 variant documented

2015–now4M2015–now4M4.0 twin-turbo diesel (SQ7)DieselDocumented issues3 knownSee faults & what to checkPhoto: Vauxford via Wikimedia Commons, CC BY-SA 4.0.

Fuel not stated

3 variants documented

2006–20154L2006–20154L3.0 TDIFuel not statedDocumented issues8 knownSee faults & what to checkPhoto: Vauxford via Wikimedia Commons, CC BY-SA 4.0.

2015–now4M2015–now4M3.0 TDIFuel not statedDocumented issues6 knownSee faults & what to checkPhoto: Vauxford via Wikimedia Commons, CC BY-SA 4.0.

2015–now4M2015–now4M3.0 TFSIFuel not statedDocumented issues6 knownSee faults & what to checkPhoto: Vauxford via Wikimedia Commons, CC BY-SA 4.0.

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.

Start your free check on this Audi Q7

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.

The checks worth doing on a Audi Q7 before you hand over any money. Every documented fault is listed below, each with its own page.

• Serious issue

  Cold-start the engine and listen at the front of the engine for chain rattle lasting more than a few seconds.

  See why

  3.0 TDI V6 Timing Chain Tensioner Failure

  The 3.0 TDI V6 (CASA/CDYA/CCMA engine codes), shared with the VW Touareg and Porsche Cayenne TDI, is highly prone to hydraulic timing chain tensioner failure. Pressure loss — caused by extended oil change intervals, low oil level, or cold-start oil starvation — allows chain slack to develop. A brief rattle on cold start escalates to chain skip and catastrophic bent-valve engine damage with little warning. Preventive tensioner and guide replacement is strongly advised on any used example before 120,000 km.

  What you would notice

  • Rattling or clattering noise from front of engine on cold start, fading after 10-30 seconds
  • Check Engine light with camshaft/crankshaft correlation codes P0016 or P0017
  • Rough idle immediately after cold start
  • Loss of power or misfires under load in advanced cases

  Typically $2,200–$19,000 to put right.

• Serious issue

  Scan for fuel pressure fault codes.

  See why

  3.0 TFSI HPFP Cam Follower Wear

  The 3.0 TFSI direct injection engine drives its Bosch high-pressure fuel pump (HPFP) via a dedicated lobe on the exhaust camshaft acting through a small hardened bucket-type cam follower. Insufficient lubrication at the camshaft-to-follower contact face causes progressive metal wear through the follower face. Once the follower wears through — typically between 60,000 and 100,000 km if uninspected — metal debris enters the HPFP, destroying the pump internals and contaminating injectors and the entire high-pressure fuel rail. Early inspection every 20,000 km is the only effective prevention; follower replacement is inexpensive if caught before penetration occurs.

  What you would notice

  • Hard starting or extended crank time before engine fires due to low fuel rail pressure
  • Rough running, misfires, or power loss under hard acceleration
  • Check Engine light with fuel pressure fault codes P0087 or P0191
  • Metallic debris found in fuel filter or high-pressure fuel components
  • Ticking noise from top of engine at the cam follower access point in some cases

  Typically $350–$9,800 to put right.

• Serious issue

  Insist on a genuinely cold first start and listen hard for a chain rattle from the rear of the engine.

  See why

  3.0 TDI timing chain tensioner rattle (rear-mounted chains)

  The 4L Q7 3.0 TDI drives its timing chains from the rear of the engine, and the tensioners wear, letting the chains rattle on cold start - typically emerging around 120,000-150,000 km. If a chain jumps, valves hit pistons and the damage is severe; because the chains are at the flywheel end, replacement means dropping the drivetrain, so it is a major job. A cold-start rattle on one of these is a serious, expensive warning.

  What you would notice

  • Metallic rattle on cold start that fades once warm
  • Rattle on shut-down
  • Camshaft correlation fault codes
  • Rough running after a rattle event

  Typically $4,000–$9,000 to put right.

• Serious issue

  Check coolant reservoir level and look for contamination or discolouration.

  See why

  3.0 TDI EGR Cooler Internal Seal Failure – Coolant Ingestion

  The 3.0 TDI V6 EGR cooler uses an aluminium matrix to cool exhaust gas before recirculation into the intake. The internal seals between coolant galleries and exhaust gas passages crack under repeated thermal cycling, allowing engine coolant to enter the EGR tract and be drawn into the combustion chambers. Coolant combustion produces persistent white or blue-white exhaust smoke and progressive coolant level loss with no external leak visible. If left unresolved the failure causes heavy coolant deposits in the intake manifold and risks hydrolocking the engine, causing connecting rod or piston damage.

  What you would notice

  • White or blue-white smoke from exhaust especially on startup or under load
  • Coolant level dropping steadily with no visible external leak
  • Sweet or steam-like smell from exhaust at operating temperature
  • EGR or coolant temperature related fault codes
  • White crystalline residue deposits inside intake manifold

  Typically $1,800–$4,000 to put right.

• Serious issue

  Ask for proof both rear axle recalls (REC-001665 and REC-005076) were done, or have an Audi dealer check the VIN.

  See why

  Rear axle nuts may break on some cars, recall REC-001665 and follow-up REC-005076 (4M Q7, 2019-2021, check VIN)

  Some 4M Q7 Audis (all engines, 2019-2021) were recalled under REC-001665 because nuts on the rear axle assembly did not meet specification and could break, which could cause loss of control. A second recall, REC-005076, followed because the first repair could leave the rear axle misaligned and wear a tyre to sudden failure. Both are free at an Audi dealer. Not every car in these years is in the recall; a dealer check of the VIN is the only way to know.

  What you would notice

  • Uneven or fast wear on the inside edge of a rear tyre
  • Car pulls or feels unsettled at the rear
  • Clunk from the rear over bumps

  Typically $0–$800 to put right.

• Serious issue

  Ask for proof the steering shaft recall (PRA 2020/18278) was done, or have an Audi dealer check the VIN.

  See why

  Steering shaft to rack bolt recall PRA 2020/18278 (4M Q7, 2015-2019)

  On the 4M Audi Q7 (all engines, built January 2015 to February 2019) the bolt joining the steering shaft to the steering rack may not have been tightened properly. If it works loose the driver can lose steering control. Audi Australia recalled these cars under PRA 2020/18278 and the check is free at an Audi dealer. Not every car in these years is in the recall; a dealer check of the VIN is the only way to know.

  What you would notice

  • Knock or clunk felt through the steering wheel
  • Free play in the steering
  • Steering wheel off centre

  Typically $0–$500 to put right.

Audi Q7 service schedule

What falls due, and at what distance, for each generation of the Audi Q7. 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.

What these repairs cost on other cars

Some of the Audi Q7’s documented faults are repairs other models share. Each page lists the documented NZ cost for every model it affects.

• Timing Chain Replacement Cost
• DPF Repair and Replacement Cost
• EGR Valve and Cooler Repair Cost

Other Audi models