BMW 218d
Modular four-cylinder diesel, successor to the N47. Timing chain now at the front of the engine — the N47's biggest problem is eliminated. EGR and DPF remain wear items.
Economy Diesel
Frugal yes, fun no. The engine keeps up with traffic but every overtake needs a run-up.
Engine Weaknesses 6
Early B47 engines (2014–2016) are prone to premature chain elongation. The tensioner can no longer compensate. Rattling on cold start is the typical warning sign before chain snap and engine damage.
Symptoms: Metallic rattling or clattering on cold start; subsides after warm-up; in advanced cases audible during driving; MIL may illuminate
Overheating and leaking EGR coolers can vaporise glycol and trigger self-ignition. BMW recalled affected vehicles. If coolant enters the combustion chamber, hydraulic lock and engine damage are possible.
Symptoms: Coolant level drops without visible leak; whitish smoke from exhaust; rough idle; MIL; limp mode; rarely smoke from engine bay
With frequent short-trip use the DPF never reaches sufficient regeneration temperature. Soot accumulation blocks the filter and the engine enters limp mode. Long-term, oil level rises due to fuel intrusion.
Symptoms: MIL with message 'Particulate filter fault'; severe power loss; increased fuel consumption; black exhaust smoke on cold start; oil level rising
Common-rail injectors operate at up to 2,500 bar and wear at higher mileages. Knocking noise on cold start and misfires on individual cylinders. Replacement is complex and expensive.
Symptoms: Knocking noise on cold start; fault code 'injection quantity out of tolerance' or 'cylinder X misfire'; stumbling; increased consumption
From about 150,000 km onwards, failures of the electronic thermostat and electric water pump become more frequent. Overheating without early warning is possible. Replacing both parts simultaneously is recommended.
Symptoms: Coolant temperature rises unusually quickly or too high; heater blows cold; fault codes relating to the water pump; rarely a sudden failure
Primarily urban short-trip use causes the EGR valve to coke up. Power loss and increased emissions.
Symptoms: Power loss, rough running, engine check light, black smoke
Vehicle Weaknesses 6
Complete failure of multiple control units due to CAN bus faults. DSC, tyre pressure monitoring, climate control, and lighting can all fail simultaneously.
Rust spots on the tailgate in the area of the rear wiper mount due to insufficiently sealed panel edges.
Condensation and moisture accumulate inside the LED tail lights. Design fault with the vent membrane — LED lights don't generate enough heat to evaporate it.
The pressure pad in the electro-hydraulic power steering wears and causes clicking noises when turning at standstill. Improved replacement part available.
Squeaking at the rear axle when absorbing bumps on M240i models with adaptive suspension. BMW Munich confirmed the issue as known.
Heat shields on the rear axle sit directly against the brake discs and start rattling or grinding. BMW replaced the shields with an improved version on affected vehicles.
Reports & Tests
7 owner complaints filed with NHTSA (2014–2021). Most reported: Electrical (2), Fuel System (2), Engine & Cooling (1).