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P0171,P0172/P1171, P1172

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE lamp (MIL) on

P0171 , P0172 / P1171 , P1172

Incorrect fuel-air mixture, adaptation lean or rich/Air flow when idling, adaptation towards closed (lean) or open (rich)


Fault symptom

CHECK ENGINE lamp (MIL) on

Condition

P0171, P0172: More than 25%% richer or more than 25%% leaner for at least 60 seconds.

P1171, P1172:

Air flow rate through the IAC valve when idling too low or too high in relation to the expected flow rate.