BMW xDrive25e

Same timing chain issue as N20 and B48. Plastic guide rails wear out, chain elongates. Slightly less loaded on the 3-cylinder.

Symptoms: Rattling on cold start, engine check light, rough idle

Early B38 engines (manual gearbox, built before April 2015) had an undersized crankshaft half-shell bearing. BMW switched to 360° bearings and replaced affected engines as a goodwill gesture (up to 120,000 km / 5 years).

Symptoms: Knocking or hammering from the engine block under load; oil pressure drop; in extreme cases engine seizure due to spun bearing

Turbocharger shaft seals become porous and allow oil into the combustion process. On the 3-cylinder, exhaust gas pressure pulses cause higher wear than on four-cylinders.

Symptoms: Blue smoke on cold start or wide-open throttle, oil consumption above 0.5 L/1,000 km, oil mist in intercooler, smoke after long motorway run.

Plastic cooling system components (expansion tank, hoses, flanges) develop hairline cracks and lose coolant gradually. On the 3-cylinder, thermal loads are higher due to uneven combustion.

Symptoms: Dropping coolant level without visible external leak, occasional coolant smell on exit, coolant warning light after longer drive.

On diesel engines, glycol can escape from the EGR cooler. Contact with soot deposits at high temperatures creates an increased fire risk. Vehicles built up to January 2017 are affected (first wave); the recall was expanded multiple times.

On the xDrive25e (plug-in hybrid), foreign objects from battery production can cause short circuits in the high-voltage pack. Vehicles with a production date of January to September 2020 are affected.

The 7G-DCT gearbox (Getrag) tends to jerk in city traffic. Delayed throttle response and harsh shift shocks when upshifting and downshifting. Cause is often a faulty EGR valve or control unit misadaptation.

On xDrive models, the transfer case leaks oil through failed O-rings and shaft seals. Typically flagged at TÜV from 60,000 km. BMW often declines warranty coverage and offers only 40% goodwill on parts.

Worn control arm bushings on the front axle cause banging noises over potholes and uneven surfaces. Meyle-HD reinforced bushings are recommended; wheel alignment is required after replacement.

Front brake discs show wear complaints at TÜV from as early as 38,000–42,000 km. A car failed its TÜV at 42,000 km showing poor contact pattern on the front discs.