P20F6 on Peugeot — White smoke and a whitish deposit on the tailpipe, with the AdBlue, engine and service lights on

Code P20F6 indicates that the injector metering AdBlue into the exhaust line is stuck open instead of closing: the reductant system is dosing urea in an uncontrolled way. On the Peugeot 208 1.6 HDI it is recognised by white smoke and a whitish deposit on the tailpipe.

System

Exhaust emissions

Component

Urea (AdBlue) injector

Fault

Heavy white smoke from the exhaust with a whitish deposit on the tailpipe; the engine warning, service and AdBlue lights are on the cluster.

Typical symptoms

• Heavy white smoke from the exhaust
• Whitish deposit on the tailpipe
• Engine warning, service and AdBlue lights on
• ‘AdBlue - Emission control fault’ message on the central display
• ‘Engine fault: have the vehicle repaired’ message on the central display

Vehicles affected

• Peugeot 208 (C) 1.6 HDI

Main code

• P20F6 Reductant system injector, bank 1 - stuck open

Related codes

• P20EE NOx sensor, bank 1 - poor efficiency
• P2463 Diesel particulate filter clogged

On this fault the diagnostic tool often returns several codes together.

Solution

See the repair procedure verified on Sema Repair.

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