Description
Common problems
- Internal corrosion or water ingress
- Short circuits or internal electrical faults
- Crystallisation of AdBlue fluid around the injector or level sensors
- Faulty temperature, level, or quality sensors within the tank
- P20E9 00 Fault Code – AdBlue/DEF Fluid Pressure: Drift Upwards
Citroën C4 Cactus AdBlue (DEF) System Repair Service
AdBlue was introduced with the Euro 6 emissions regulations to help cut the harmful nitrogen-oxide (NOx) output of diesel engines.
When the system develops a fault, the dashboard typically shows an “Emission Control Fault” message and illuminates the engine warning lamp. If left unresolved, the vehicle can drop into limp-home mode or display a mileage countdown after which it will refuse to restart.
Commonly Affected Part Numbers:
9818703780, 9812914780, 9808559680, 1682620380, 16 826 203 80, 98 129 147 80, 98 187 037 80, 1682615880
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