2.0 EcoBlue AdBlue SCR System and NOx Sensor Failure
ModerateExhaust & EmissionsOn 2018–2021 facelift models equipped with the 2.0-litre EcoBlue diesel engine, the Selective Catalytic Reduction (SCR) exhaust emissions system is prone to premature component failure. The upstream and downstream nitrogen oxide (NOx) sensors frequently suffer internal ceramic heater circuit failure or become fouled with soot. Furthermore, crystallised urea deposits can clog the AdBlue dosing injector in the exhaust downpipe, triggering an engine management warning and initiating an irreversible countdown preventing engine restart within 500 miles.
Amber engine management warning light illuminated with diagnostic trouble codes P229E or P20EE, No Engine Restart in XXX miles warning message displayed permanently on the instrument cluster, White powdery urea crystallization visible around the exhaust SCR injector nozzle assembly
- Scan the OBD-II diagnostic port for stored or pending NOx sensor and SCR efficiency trouble codes
- Confirm that the vehicle displays a normal AdBlue range and does not show an active non-restart countdown