A4 B9
1 generation · Select a generation to see engines
Which Audi A4 B9 engine is the most reliable? See common problems, reviews and reliability verdicts across generations and engines.
Frequently asked questions
Which Audi A4 B9 engine is the most reliable?
2.0 TDI (EA288) — Maint. Sensitive verdict. The 2.0 TDI (EA288 — shared across the A5/Q5/Passat/Tiguan, with quattro available) is the high-mileage B9 A4 choice: strong, very economical and ideally matched to the executive saloon/estate. It's the post-dieselgate EA288 with the standard modern-diesel cautions: DPF clogging on short trips, EGR sooting, AdBlue/SCR sensor/pump faults, injector wear and occasional coolant-pump attention. A motorway-driven, serviced car is a genuine 300k long-hauler — the sensible engine for the miles. Buy on oil, DPF and AdBlue history.
Which Audi A4 B9 engines should you avoid?
None of the Audi A4 B9 engines listed are rated "Problematic" or "Avoid" — but always check the service history before buying.
What are the most common Audi A4 B9 problems?
The most commonly reported problems across all Audi A4 B9 generations and engines: DPF / EGR / AdBlue, Injector / coolant pump, Chain tensioner / PCV / carbon, S tronic dual-clutch.