Code Description
21 Upstream oxygen sensor response slower than minimum required switching frequency.
Upstream oxygen sensor heating element circuit malfunction.
Downstream oxygen sensor heating element circuit malfunction.
Downstream oxygen sensor input voltage maintained above the normal operating range.
Oxygen sensor voltage too low, tested after cold start. (Upstream or Downstream)
31 An open or shorted condition detected in the A/C clutch relay circuit.
Insufficient or excessive vapor flow detected during evaporative emission system operation.
42 An open or shorted condition detected in the auto shutdown relay circuit.
An open condition detected in the ASD relay output circuit.
An open or shorted condition detected in the fuel pump relay control circuit.
An open circuit between PCM and fuel gauge sending unit.
Circuit shorted to voltage between PCM and fuel gauge sending unit.
51 A lean air/fuel mixture has been indicated by an abnormally rich correction factor.
55 Completion of fault code display on Check Engine lamp.
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