Ignition coils, injectors, and oil leaks affecting the electrical system
Often reportedOn N20 engines, ignition coil and injector failures are reported; sometimes linked to oil leaks contaminating electrical components.
Engine Bay
When buying a used BMW 4 Series 420i 2016 (F32 / F33 / F36 / F82 / F83), the most frequently mentioned issue: ignition coils, injectors, and oil leaks affecting the electrical system. Also, lubrication problems, oil pump gear, and risk of seizure are commonly reported.
Engine varies by trim; verify the engine code on the listing.
Listed from most frequently reported, each with its source.
On N20 engines, ignition coil and injector failures are reported; sometimes linked to oil leaks contaminating electrical components.
Engine Bay
Engine seizure and damage cases are reported due to design-related issues (oil pump gear and related parts) and debris buildup from worn components. In some instances, this has also led to turbo failure.
Engine Internal
On the N20 2.0 engine, premature wear of timing chain guides is a documented issue and can lead to chain stretching or breakage.
Timing chain
Same trim, different year
We only publish claims we can verify. Cards come from Difetti fault records matched to this vehicle on brand, fuel, engine and generation.