A4 B9
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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?
1.4 / 2.0 TFSI (EA888 Gen3) — Maint. Sensitive verdict. The petrols — the economical 1.4 TFSI (EA211) and the volume 2.0 TFSI (EA888 Gen3, shared with the A5/Q5/Passat) — make the B9 A4 refined and quick. Gen3 EA888 is much improved over the oil-burning Gen2: chain-driven, robust, with the usual modern cautions — occasional chain-tensioner attention, PCV faults, direct-injection carbon and water-pump items, plus the S tronic dual-clutch (where fitted) wanting fluid discipline. The 2.0 TFSI's later 'B-cycle' (Miller) versions are efficient and well-regarded. A documented car with a healthy chain is dependable. Buy on oil and gearbox 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: Chain tensioner / PCV / carbon, S tronic dual-clutch, DPF / EGR / AdBlue, Injector / coolant pump.