BMW 230i
Modular four-cylinder turbo, the workhorse of the current model range. Very broad power spectrum from 135 to 306 hp. Reliable; watch oil consumption and turbocharger at high mileage.
Rear-Wheel Drive Returns
Modern coupe with rear-wheel drive and ZF 8HP — genuine driving pleasure.
Engine Weaknesses 6
Timing chain guide rail can break; chain jump and engine damage follows. More common on early production years and with spirited driving.
Symptoms: Rattling, clattering from the engine, sudden power loss, engine damage
Oil filter housing with integrated oil/water heat exchanger leaks. Coolant loss and overheating risk from about 60,000 km.
Symptoms: Coolant level warning, oil puddle under engine, overheating
A plastic bleed line between the cylinder head and expansion tank becomes porous and breaks. Coolant loss follows; the mounting location is difficult to access, so labour costs dominate.
Symptoms: Dropping coolant level; coolant warning on the instrument cluster; faint sweet smell; no visible puddle under the car
The wastegate linkage on the B48 turbocharger has too much play by design and rattles, especially on cold start and at low revs. BMW offers a repair kit (e-actuator 11655A7A286) as a goodwill measure.
Symptoms: Metallic rattling or clattering from the turbo area on cold start and at idle; disappears at higher revs
As a direct-injection engine the B48 does not wash the intake valves with fuel. Oil vapour from crankcase ventilation and EGR gases form deposits that reduce flow and cause misfires.
Symptoms: Stumbling on cold start; power loss at high revs; rough idle; increased fuel consumption
The crankcase ventilation (PCV) integrated into the valve cover wears out and allows oil into the intake tract. Because PCV and valve cover are a single unit on the B48, the entire cover must be replaced.
Symptoms: Increased oil consumption (>0.5 L/1,000 km); blue smoke on cold start; oil in the intake line; rough idle
Vehicle Weaknesses 7
LED headlights on the G42, especially the M240i, show known moisture issues including water pooling inside the housing. Cause appears to be a faulty seal at the heatsink for the DRL/sidelights. Warranty replacement often required.
Widespread problem — especially on M240i models. Water collects inside the headlight; right side more frequently affected.
On the G42 220d the rear axle is unsettled with a rumbling character and poor brake modulation: brakes feel initially soft, then bite abruptly.
Central display crashes are known, particularly with older software versions.
The known tail light moisture issue from the F22 generation carries over to the G42.
Uncomfortable rumbling from the rear axle over expansion joints and potholes. Combined with the sport suspension, the ride becomes harsh.
Several G42 owners report intermittent rattling from the passenger side, occurring mainly without a passenger and at cold temperatures. BMW opened TSARA cases; workshops applied felt tape to trim without lasting success.
Reports & Tests
1 owner complaints filed with NHTSA (2021–2025). Most reported: Electrical (1).