FAULT CODE READING

OBD2 codes.

A code identifies a signal or system that needs to be checked, not a part you should replace.

1 code entry · 1 related fault

P0403EGR valve control circuitUrgency medium

Exhaust Gas Recirculation Control Circuit

The ECU moves the EGR valve with a motor or a solenoid to let exhaust gas into the intake.

What the car has detected

The ECU has found an electrical fault in the valve control: broken or shorted wire, a fuse or the valve itself.

The car usually keeps running, but it may lack power or stall at idle if the valve stays open. Have it checked soon.

Ask for the fuse, connector and wiring of the EGR valve to be checked before it is replaced.

Go to a garage in the next few days. Testing the valve and its wiring needs a diagnostic tool.

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.