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ME9 / P0139 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Malfunction Indicator Lamp

  P0139 00


O2S 2 Signal, Stuck Rich

Fault symptom

Malfunction Indicator Lamp

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage greater than 10.5 V.
Engine running.
Preheating circuit in normal operating range for more than 20 seconds.
Fuel level over 12%.
Air mass more than 10 g/s.

Fault criteria:

The voltage is 150 mV higher after a fuel shut-off longer than 3 seconds.

Checking the wiring harness

Move the wiring harness at several spots and in several directions to reveal intermittent breaks and short-circuits. Check switches, connectors and crimp connections for oxidation, retracted pins and pin clamping force.

Diagnostic help

Diagnosis regards:

Improperly mounted/defective sensor

Functions in the diagnostic tool related to the fault:

Test value:
O2S 2
O2S 2 Preheating

(See also description of readings/activations in diagnostic tool)