EGR Cooler Leak
SeriousExhaust & EmissionsThe N57 diesel engine in 30d, 40d, and M50d models is subject to safety recall campaigns regarding glycol coolant leaking into the EGR module, reacting with diesel soot to create thermal damage and fire risk.
Gradual coolant loss without obvious external drips, Burning exhaust odour entering cabin through air vents, Drivetrain alert or engine warning light
- Check BMW main dealer service record for completed EGR cooler recall codes
- Examine plastic intake manifold for localized blistering or soot accumulation around EGR connector pipe