AdBlue Tank Assembly Repair – Peugeot Partner / Citroën Berlingo (2008–2018)

AdBlue was introduced along with Euro 6 emission standards as an aid for reducing the harmful nitrogen oxide (NOx) emissions that diesel engine vehicles produce.

A common symptom of failure is an “Emission Control Fault” message appearing on the dashboard, often accompanied by the engine warning light. If not addressed in time, the vehicle may even enter limp mode or display a countdown indicating that it will not restart after a certain number of miles.

 Common Faults 

One of the most common issues involves defects in the integrated AdBlue control unit (mounted within the tank). These may include:

• 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

These faults may also cause communication issues with the engine ECU or other systems within the vehicle. Often, the complete AdBlue tank assembly must be replaced; however, a remanufacture is often a far more cost-effective and sustainable solution.

Observing and Diagnosing Faults

Technicians may notice during diagnosis that the system is no longer heating the AdBlue fluid, even when required (e.g. in colder temperatures). A short circuit in the control unit may also prevent diagnostics communication, or a fault may be stored with a permanent status that cannot be cleared.

In some cases, crystallisation caused by AdBlue residue may block the injector or damage internal wiring and sensors, contributing to system errors and inaccurate readings.