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CriticalCommonEngine

Audi A8: 3.0 TDI V6 Timing Chain Tensioner Failure

3.0 TDI V6 Timing Chain Tensioner Failure is a common engine fault on the Audi A8 on the 2002–2017 cars, and we rate it critical. Putting it right costs $2,800 to $7,500 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 7 documented faults on the Audi A8.

Vehicle
Audi A8
Engine
3.0L
Years
2002–2017
Fuel
diesel
Gearbox
auto
System
Engine

This page covers the Audi A8 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Audi A8 faults7 documented faults on this model

What you are looking at

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

What goes wrong

The 3.0-litre TDI V6 diesel (ASB, CDSA, CREC, and related codes in D3 and D4 A8) shares the documented timing chain tensioner failure that affects the VW/Audi 3.0 TDI engine family. The hydraulic chain tensioner loses pressure at cold start when oil viscosity is high and oil pressure takes time to build, allowing chain slack. Over time the plastic guides wear down, followed by chain stretch. Failure is silent until advanced — cold-start rattle is the primary warning. If the chain jumps a tooth, catastrophic valve-to-piston contact results. This fault is acknowledged across the A6, A7, A8, and Q7 with 3.0 TDI and is a known issue to any Audi-experienced workshop in NZ/AU.

What you would notice

  • Cold-start timing chain rattle from front of engine (disappears within 30 seconds as oil pressure builds)
  • Camshaft position correlation fault codes (P0016, P0017 range)
  • Rough running during cold warm-up phase
  • In severe cases: engine failure or bent valves if chain jumps a tooth

How to check it

Where to look. Front of engine (accessory/belt end) — timing chain, hydraulic tensioner, and plastic chain guides

  1. 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.

  2. Scan for P0016/P0017 or camshaft timing codes.

  3. Review service history for strict oil change compliance — any gap over 10,000 km on an older car is elevated risk.

Parts involved: Timing chain.

What it costs to put right

$2,800 to $7,500 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

  • “Has the timing chain, tensioner, or guides been replaced?”
  • “Has the engine ever produced a cold-start rattle from the front?”
  • “What were the oil change intervals in kilometres and time?”
  • “Are there any stored camshaft timing or correlation fault codes?”

Now check the Audi A8 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Audi A8 buyer questions

Is 3.0 tdi v6 timing chain tensioner failure serious on a Audi A8?

We rate it critical and common on the Audi A8. The 3.0-litre TDI V6 diesel (ASB, CDSA, CREC, and related codes in D3 and D4 A8) shares the documented timing chain tensioner failure that affects the VW/Audi 3.0 TDI engine family. The hydraulic chain tensioner loses pressure at cold start when oil viscosity is high and oil pressure takes time to build, allowing chain slack. Over time the plastic guides wear down, followed by chain stretch. Failure is silent until advanced — cold-start rattle is the primary warning. If the chain jumps a tooth, catastrophic valve-to-piston contact results. This fault is acknowledged across the A6, A7, A8, and Q7 with 3.0 TDI and is a known issue to any Audi-experienced workshop in NZ/AU.

How much does it cost to fix on a Audi A8?

$2,800 to $7,500 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Audi A8 years are affected?

Our research records this fault on the 2002–2017 Audi A8. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

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. Scan for P0016/P0017 or camshaft timing codes. Review service history for strict oil change compliance — any gap over 10,000 km on an older car is elevated risk. Look here: Front of engine (accessory/belt end) — timing chain, hydraulic tensioner, and plastic chain guides