Models · Audi
Audi Q7 4L buying guide
The first Q7 was built from 2006 to 2015 as a seven-seat SUV with quattro four-wheel drive on every version, mostly sold with the 3.0 TDI V6 diesel. It's generally reliable, with a small number of well-known things to check.
The versions
- 3.0 TDI V6 diesel, the most common choice
- Petrol: 4.2 V8 and 3.6 V6 at first; from 2010, a supercharged 3.0 TFSI V6 replaced both
- 6.0 V12 TDI diesel, offered from late 2009 and very rare
- 6-speed automatic until the 2010 update, then an 8-speed automatic, both with Tiptronic manual control
- quattro permanent four-wheel drive on every version; adaptive air suspension standard on V8s and optional on others
What to check on a 4L Q7
3 model-specific things to look at when you view one. They're a starting point, not the full inspection.
Air suspension ride height
What to look for: Ask for the car to have stood overnight, and look at it from each corner before it's started. It should sit level, without one side or corner lower. With the engine running, raise and lower it through the modes.
Why it matters: Cars with adaptive air suspension can lose height from leaking air springs, a faulty valve block, leaking lines or a tired compressor. A faulty height sensor can also make it sit unevenly without any leak. Specialists find and fix the leak before replacing a compressor, because a new compressor on a leaking system overheats too.
3.0 TDI timing chain rattle
What to look for: On a 3.0 TDI, ask for the engine to be completely cold when you arrive, and listen for a metallic rattle in the first seconds after starting.
Why it matters: The 3.0 TDI's timing chains sit at the back of the engine, and the tensioners and guide rails wear with mileage. A cold-start rattle is the sign, and it shouldn't be ignored, because the timing can jump. A quiet start, or invoices for chain work, is what you want to see.
3.0 TDI particulate filter and EGR
What to look for: Ask how the car has been used. On the drive, note any warning lights, flat spots or loss of power, and whether it goes into a reduced-power mode.
Why it matters: The particulate filter clogs on cars used mostly for short trips, and the exhaust gas recirculation valve can coke up and stick. A specialist can read the soot level and regeneration history to tell whether a long run will clear it or a part is at fault. A car used for longer journeys is less likely to have the problem.
Also in the full guide
- Front tyre wear
- Panoramic roof and water leaks
- Tailgate and brake servo recalls
- The cold start, test drive and paperwork checks for the exact version you're viewing
The full guide to the 4L Q7
The CrankSight guide walks you round the car on your phone at the viewing, with every check for the exact version you're looking at: what to look for, where to find it, and what anything you find is likely to cost. As you go it builds an assessment of that car, and if you view more than one, it lines them up side by side.
£29 for the model, used on as many cars as you like, delivered within 72 hours or your money back.
Other generations
General points for the model, last checked October 2026. Every car is different, so treat this as a guide to what to look at, not a verdict on any car. CrankSight is independent and has no connection with Audi.