Citroen DS3 MK1 E3 AdBlue (DEF) System Repair Service (2015-Present)

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 DS3 Picasso 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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Send electronics only – do not send the full AdBlue tank. Sending the full tank will delay the repair and will incur a £50 surcharge due to higher postage costs.