The B7-generation A4 with the well-proven 1.8T — old enough now that most examples still on the road have already had their weak points addressed, which works firmly in a buyer's favour.
The B7 A4 is a modestly sized saloon that doesn't overload this engine — it was a comfortable, unstressed pairing when new and remains so on surviving examples today.
At this age and price point, the car's own condition (rust, suspension wear, electrics) often matters more to overall reliability than the engine itself, which by now is a known, well-documented quantity.
This is about the car itself — for engine-specific failure points, see the dedicated engine page below.
This generation of A4 shares its 1.8T with a wide range of Audi and VW Group models from the same era. Full detail on known failure points and the critical timing belt interval lives on the dedicated engine page.
FULL ENGINE BREAKDOWNAudi 1.8T (EA113) — Reliable or Not →Get documented proof of the timing belt interval before anything else — this matters more than almost any other check on a car this age.
Inspect the subframe and wheel-arch areas closely for rust, which is now a bigger practical risk than any engine issue on surviving B7s.
Budget for general age-related wear — bushings, electrics, trim — separately from the engine's own, generally low, risk profile.