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P0401, P0402

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE lamp on. Loss of performance. Limp home. Cruise Control does not work.

P0401, P0402


P0401 EGR Flow too Low.

P0402 EGR Flow too High.


Fault symptoms


CHECK ENGINE lamp on.

Loss of performance.

Limp home.

Cruise Control does not work.


Conditions

Diagnosis active up to 2000 rpm.

The following conditions apply for this DTC:


P0401: The flow of exhaust gas through the EGR valve is so low that a control deviation of more than 75 mg air/combustion has been present for more than 12 seconds.

P0402: The flow of exhaust gas through the EGR valve is so high that a control deviation of more than 75 mg air/combustion has been present for more than 12 seconds.


Diagnostic help

Using the diagnostic tool, adjust the EGR control up and down.

The DTC indicates the presence of a mechanical fault. A leak anywhere in the intake system or vacuum system can generate the DTC.

In the event of a fault, boost pressure control is disengaged.


P0401: DTC indicates air leakage between the turbo and the intake manifold.

P0402: DTC indicates air leakage between the mass air flow sensor and the turbo (including crankcase ventilation hose).


A defective mass air flow sensor can generate both DTCs.

Important

The EGR valve will close after one minute at idling speed. The diagnosis is active during EGR regulation.