BMW 114i
Compact turbo four-cylinder based on the PSA collaboration (Prince engine). Timing chain and turbocharger are known weaknesses; regular oil changes are essential.
Turbo Four
Small-displacement turbo — gets the job done, but zero personality.
Engine Weaknesses 7
Prince engine with known timing chain defect. Plastic chain tensioner becomes brittle, chain stretches. If ignored, valve and engine damage is likely.
Symptoms: Rattling on cold start, engine warning light, rough idle, power loss
The O-rings on the turbocharger oil feed and return lines harden and crack. Oil enters the engine bay and, if repair is delayed, can starve the turbocharger of lubrication.
Symptoms: Burning oil smell; visible oil film around the turbocharger; slight blue smoke under acceleration; whistling turbo noise if bearing damage develops
From around 100,000–150,000 km, N13 engines show increased oil consumption through worn piston rings and valve stem seals. Ignored oil consumption causes cylinder wall scoring.
Symptoms: Oil level drops more than 0.5 L/1,000 km; light blue smoke when accelerating; oil pressure warning at low level; no oil spots under the car (oil is being burned)
The plastic coolant connector at the rear of the cylinder head warps from heat and loses its seal. Affects early F20 build dates up to around 2014. Improved replacement part available.
Symptoms: Coolant level warning, dried coolant traces on the gearbox casing, continuous coolant loss without visible overheating.
The turbocharger shaft seals become porous and allow oil into the charge air flow. Occurs especially at high mileage and with frequent short-trip driving.
Symptoms: Blue smoke on cold start or under hard acceleration, increased oil consumption, oil mist in the intercooler, occasional sweet smell from the exhaust.
Wear in the wastegate mechanism causes rattling, especially at low rpm. Less widespread than on the N54 but documented.
Symptoms: Metallic rattling at low load, clattering at idle
The camshaft adjustment solenoid valves in the PSA/BMW Prince engine become fouled and wear. Affordable Pierburg replacement valves are available; fault codes on failure are straightforward to diagnose.
Symptoms: Rough idle, hesitation at low rpm, engine warning light, camshaft adjustment fault code.
Vehicle Weaknesses 6
EPS issues are widespread on the F20: the rack binds, aluminium bolts corrode on vehicles built July 2011–May 2015, and the electric motor can detach from the rack. Full replacement usually necessary.
The EGR valve and EGR cooler can fail or leak on N47 and B47 diesel engines. In the worst case, coolant ingress can cause engine fire.
Water enters through displaced cable grommets, faulty door seals, or blocked sunroof drains. Problem occurs across all F20 production years.
On N13 and N55 engines, valve cover gaskets go brittle and the crankcase ventilation fails. Oil consumption rises to 0.5–1 litre per 3,000 km.
Shaft seals on the rear differential leak gear oil. Problem often appears as early as 25,000–50,000 km, especially on M135i and M140i.
Clattering rear axle caused by worn shock absorbers, known from production date 04/2012 onward. Dampers are regularly flagged at MOT. Track rod ends also wear prematurely.
Reports & Tests
160 owner complaints filed with NHTSA (2011–2019). Most reported: Airbags (85), Engine (24), Engine & Cooling (20).