The E90/E91/E92/E93 3-Series spans naturally-aspirated N43/N46 fours and N52 sixes, the twin-turbo N54 (335i) and later single-turbo N55, and M47/N47/M57/N57 diesels. Risk is strongly engine- and build-window-dependent — the N54's fuel-system items and the diesels' swirl flaps are the usual watch-points. This is an editorial summary, not a reliability rating; per-configuration facts and their evidence below.
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Filtered: N47 · 2.0L diesel (N47).
Known issues
Sorted by severity. Tap an issue to reveal its symptom, repair and what to check.
HighEGR cooler leaks / clogging (N47)EU market
HighTurbocharger wear (N47)EU market
MediumDPF clogging on short trips (N47)EU market
MediumInjector wear (N47)EU market
MediumIntake swirl-flap wear (N47)EU market
Engines & reliability
Tap a row to filter the issues to that engine.
Pre-purchase checklist
Cold start
☐Listen for chain rattle during a fully cold start
Diagnostics
☐Scan for low-rail-pressure DTCs before the test drive
Maintenance
Key service intervals — vary by engine and driving conditions.
ItemIntervalCost
Electric water pump / thermostat100,000–120,000 km