Models · Audi
Audi A4 B9 buying guide
The B9 A4 was sold from 2015 to 2024 as a saloon, Avant and raised allroad, with TFSI petrol and TDI diesel engines and front-wheel drive or quattro. It was facelifted in 2019 and again in 2020, and many owners report trouble-free motoring.
The versions
- Petrol: 35 TFSI (1.4 or 2.0, 150PS), 40 TFSI (2.0, 190PS) and 45 TFSI (2.0, 252PS)
- Diesel: 2.0 TDI (136 to 190PS, badged 30, 35 and 40 TDI) and 3.0 TDI V6 (218 or 272PS, badged 45 and 50 TDI)
- 7-speed S tronic dual-clutch automatic on most versions
- Front-wheel drive or quattro
- Saloon, Avant and allroad
What to check on a B9 A4
3 model-specific things to look at when you view one. They're a starting point, not the full inspection.
2.0 TFSI: oil use
What to look for: Ask how much oil the car uses between services and how the seller knows. Check the level on the dashboard display.
Why it matters: High oil consumption is reported on the 2.0 TFSI petrol. A steady level between services is a good sign, and a dealer can measure consumption if you're unsure.
Coolant level and water pump
What to look for: With the engine cold, check the coolant tank is between its marks, and look for dried coolant residue around the front of the engine.
Why it matters: Occasional water pump leaks are reported across the range. Caught early, it's a straightforward repair.
S tronic at low speed
What to look for: Pull away gently several times, reverse, and creep in traffic. Notice any lurch or jolt as the clutch takes up.
Why it matters: Occasional lurches from the S tronic are among the reported faults. Smooth low-speed behaviour is what to look for, and software updates help some cars.
Also in the full guide
- Diesel: particulate filter
- ABS warning light
- Recall work
- Infotainment and interior noises
- The cold start, test drive and paperwork checks for the exact version you're viewing
The full guide to the B9 A4
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.