Before you buy a used Audi Q7 (4L).
Taken only from Testigo's sourced sheets. Use it to question the seller and on the test drive: it does not confirm that any particular car is affected.
The essentials.
- 3 documented, sourced faults across its 5 engines.
- 1 of them depends on the equipment or the production date: ask what this car has.
- 1 official recall on record: ask for the chassis number (VIN) and confirm it has been done.
- According to the data we have, the engines with the fewest documented faults are: 4.2 TDI V8 (Diesel), 3.6 FSI V6 (Petrol), 6.0 TDI V12 (Diesel).
Typical faults by engine
The period and mileage are those mentioned by each sheet's sources. They are not a maintenance interval and do not predict that any particular car will fail.
All versions
Sheets the catalogue links to all 5 of its engines.
- A/C not cooling: N280 valveClimate control
- Period mentioned
- 2006–2026
- Mileage mentioned
- The sheet does not mention a mileage.
Applies if: Only if fitted with the air conditioning system described.
3.0 TDI V6
Diesel
- V6 TDI rear chains, intake flaps and leaksTiming / intake / leaks
- Period mentioned
- 2004–2018
- Mileage mentioned
- 100,000–150,000 km
4.2 TDI V8 · 3.6 FSI V6 · 6.0 TDI V12
4.2 TDI V8 (Diesel) · 3.6 FSI V6 (Petrol) · 6.0 TDI V12 (Diesel)
We have no faults specific to this engine, only those common to every version.
4.2 FSI V8
Petrol
- 4.2 V8 rear chains and carbon build-upTiming / intake
- Period mentioned
- 2003–2015
- Mileage mentioned
- From 40,000 km
Which engine has the fewest documented faults?
| Engine | Documented faults | Recalls |
|---|---|---|
| 3.0 TDI V6Diesel | 21 with conditions | 0 |
| 4.2 TDI V8DieselFewest documented | 11 with conditions | 1 |
| 3.6 FSI V6PetrolFewest documented | 11 with conditions | 1 |
| 4.2 FSI V8Petrol | 21 with conditions | 0 |
| 6.0 TDI V12DieselFewest documented | 11 with conditions | 0 |
According to the data we have, the engines with the fewest documented faults are: 4.2 TDI V8 (Diesel), 3.6 FSI V6 (Petrol), 6.0 TDI V12 (Diesel).
By fuel, all versions have the same number of documented faults.
We only count the sourced sheets we have. An engine with fewer is not guaranteed to be more reliable: it may have been studied less or sold in smaller numbers.
Official recalls: ask before you pay
A recall existing does not mean this car is affected or that it is still outstanding: it depends on the chassis number, the market and the production date.
- Ask the seller for the chassis number (VIN): it has 17 characters, appears in the car's documents and can usually also be seen at the base of the windscreen.
- Ask an official Audi dealer, or the brand's official website if it lets you check by chassis number, whether each recall has been done or is still outstanding for that VIN.
- Manufacturer recalls are normally carried out free of charge by the official service network. If one is outstanding, ask for it to be done before you close the sale.
Abrupt powered tailgate closure (55E4)Bodywork
Engines: 4.2 TDI V8 (Diesel) · 3.6 FSI V6 (Petrol)
How to check it: Confirm VIN and replace tailgate motors.
View full entryOn the test drive: what to look and listen for
Taken from each sheet's symptoms and checks. You can tick off what you have already looked at: it is saved only in this browser.
0 of 3 checked
Timing / intake / leaks
Look out for: Chain rattle for the first seconds after a cold start; power loss or limp mode from the intake flaps; coolant or oil loss in the engine V; EGR faults with rough idle.
Ask them to check: Listen to a cold start (a rattle lasting more than 2–3 seconds is a bad sign), check flap operation with a diagnostic tool, look for leaks in the engine V and check the oil change history.
Timing / intake
Look out for: Rattle from the rear of the engine on a cold start, misfires or an engine light for timing deviation; on FSI engines, power loss and rough idle from carbon build-up.
Ask them to check: Listen to a cold start, read crank-cam correlation codes and inspect the intake valves with a borescope.
Climate control
Look out for: The air does not cool or cools intermittently (for example only at motorway speed), and sometimes the compressor rattles with the A/C on. Codes 01232 (N280 valve), P2612 or 00898.
Ask them to check: Read the codes and N280 control current with VCDS or ODIS, measure its resistance (about 10 ohms) and check the connector and wiring before replacing parts. If the valve or compressor is replaced, the whole circuit must be flushed.
Sources
Every fact on this page comes from these Testigo sheets and their original sources. Sources are not checked in real time.
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