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P0402 , P0403

Read the instructions below then start the fault diagnostic procedure.

Symptom: Check Engine on. Poor performance.

P0402 , P0403


P0402 EGR Flow Too High

P0403 EGR Flow Too Low


Fault symptom


Check Engine on. Poor performance.


Conditions

The following conditions apply for the DTC in question:


P0402: The exhaust gas flow through the EGR valve is so high that a control deviation of more than 75 mg air/combustion has been present for more than 6 seconds.

P0403: The exhaust gas flow through the EGR valve has been so low that a control deviation of more than 75 mg air/combustion has been present for more than 6 seconds.


Diagnostic help

This DTC indicates a mechanical malfunction or vacuum malfunction. A leak anywhere in the circuit can generate this DTC.