OBD2 CODE

P0403 Emission control

We do not have a full sheet for this code yet, with its causes and checks. What you see here comes from the OBD2 code standard.

What do I do now?

If the engine light flashes, the car loses a lot of power, overheats or the brakes fail, stop somewhere safe and call for assistance.
If the car drives normally, book a garage and show them this code: its exact meaning and the cause depend on each model.
Tell us what you notice: the diagnosis takes the code, your car and the symptoms into account.

A generic X-ray car with this code's area marked in red: engine. It is a guide, not the layout of your model.

EGR valve sticking with deposits on the 1.5 dCiExhaust and emissions

Engine / equipment: 1.5 dCi (K9K) with an electric EGR valve
Period mentioned: No specific period published
Symptoms: Uneven idle, jerks when accelerating, lack of power or the engine going into limp mode, sometimes with the engine warning light on.
Possible cause described: Soot and oil deposits leave the EGR valve stiff, stuck closed or not closing fully. According to Pierburg it is rarely a fault of the valve itself: the oil comes through the crankcase breather, a turbo with worn bearings or a blocked oil return, late oil changes or too high a level, and many short trips, above all in winter.
Check for the garage: At the workshop: read the codes with diagnostic equipment (EOBD P0400 to P0404 or P0172; Renault DF077, DF084 or DF241), test the valve electrically and its opening with the engine warm, and find where the oil comes from (breather, turbo, level). Pierburg advises against cleaning it, as it can be damaged: it is replaced if faulty, and an engine ECU update sometimes solves it.
Cost cited in the source: No verified estimate; ask the workshop for a quote for the EGR valve.A rough figure from the original database, not an up-to-date quote.