How the Citroën AdBlue system works
Covers: Relay, Dispatch, Berlingo, C4, C5 Aircross BlueHDi.
Citroën shares PSA BlueHDi hardware with Peugeot: a tank module housing the pump and heater, a dosing injector and NOx sensors, managed by the engine ECU.
Common Citroën AdBlue faults we see first
- Tank module pump and heater failures
- 'Starting impossible' countdown messages
- NOx sensor and efficiency codes
- Repeat faults after a module has been replaced without calibration
What we check before quoting
We confirm the ECU calibration and module part number, and check whether a previous repair has left adaptations incomplete.
Send us the registration and the exact dashboard message or fault code by WhatsApp. We confirm the ECU type and whether the job is suitable before arranging a visit.
Who this is for
Relays used for motorsport support and Berlingos used on private sites are the typical off-road cases we are asked about.
Important — legal position
Disabling or removing a working emissions control system on a vehicle used on UK public roads is not lawful and will fail an MOT. This service is only for vehicles used off-road, in competition, on private land or exported. Road-registered vehicles in UK use get diagnosis and repair instead.
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