BMW 118i

The N43B20 has a known timing chain problem. The chain tensioner fails prematurely and plastic guide rails break. BMW published an improved tensioner in October 2016 (11318685091), but the underlying issue remains.

Symptoms: Rattling or clattering on cold start and during load changes. In advanced stages, engine damage through chain jump or breakage.

The N43 timing chain stretches significantly from 60,000 km. Plastic guide rails crumble; fragments fall into the oil sump and block the oil pump. BMW carried out a goodwill campaign.

Symptoms: Judder for the first 1–2 km after cold start; camshaft sensor faults (P0011, P0012, P0341); oil pressure warning; clattering on start; "continue with caution" warning message

The stratified-charge piezo injectors wear from around 80,000–100,000 km. Failure requires complete replacement of all four injectors. Calibration values must be programmed into the control unit.

Symptoms: Hesitation and misfires especially after cold start; misfires in specific cylinders; rough idle; fuel smell; improvement once engine is warm

The direct injection high-pressure pump fails and causes extended cold starts or hesitation under full load. Fault codes 2FBF, 2FBE, 29DC, 29E2 are typical.

Symptoms: Very long cold start (several seconds), hesitation under hard acceleration, fault memory entry for fuel pressure.

The NOx sensor on the lean-burn system fails regularly, causing the ECU to abandon stratified charge operation. Fuel consumption rises noticeably. The NOx catalyst ages and must be replaced.

Symptoms: Noticeably increased fuel consumption, NOx catalyst ageing fault code in memory, engine warning light.

The electromechanical power steering (EPS) can fail completely on 2007–2012 models. A recall was issued for certain production years.

Rear subframe is prone to severe corrosion from around 100,000 km, including through-rust. MOT failure possible. Repair often costs more than the car is worth.

Broken suspension springs and rusty spring perches are frequently flagged on the E87 per TÜV reports. Worn track rod ends are also a known defect. Affects both front and rear axle.

Rust forms on the tailgate particularly around the badges and rear wiper. Hemmed edges and hinges can also be affected.

Water enters through faulty door seals, blocked sunroof drains, or cracked body grommets, reaching the footwell and boot. Electrical damage possible.

Rubber bushings on the rear control arms lose their elasticity. Camber change and MOT failure possible. Replace both sides simultaneously.