The Audi A4 B9 (internal code name 8W) is based on the Volkswagen Group's modular MLB Evo platform. Launched in late 2015 and facelifted in 2019 (Phase 2), it marks a major technological leap compared to the B8, notably introducing the famous Virtual Cockpit and an array of driving aids. Although the market is shifting towards gasoline and hybrid, the A4 B9 remains a quintessential long-distance cruiser, where diesel engines (TDI) excel with their exceptional fuel efficiency and comfort on long journeys. The finish quality is an absolute benchmark in its category. Overall reliability is very good, with the early issues of previous generations (TFSI oil consumption, fragile flywheels) having been largely corrected, although diesel emission control systems (AdBlue/DPF) remain points of conce
The Audi A4 B9 is a safe bet on the used car market. It has successfully corrected the serious reliability flaws of the previous generation (B8). For high-mileage drivers, the 2.0 TDI is an excellent choice: it is mechanically indestructible, quiet, and exceptionally fuel-efficient. However, a budget should be kept for potential AdBlue system quirks or preventive water pump replacement. V6 TDI versions offer superior driving pleasure but require a well-stocked wallet for maintenance. If you drive a lot in the city, avoid diesel and opt for a 2.0 TFSI, which is very reliable in this generation (Gen3/Gen4). Prioritize facelifted models (post-2019) which benefit from more reliable electronics and a modernized multimedia system.
| Oil change | £70 – 130 |
| Timing belt | £500 – 1 000 (pour 2.0 TDI) |
| Clutch | £750 – 1 400 (pour boîte manuelle) |
| Complete brakes | £220 – 480 |
| Estimated annual budget | £550 – 1 100 |
Indicative estimates (independent garage, UK market). Prices vary by region and year.