ME9 / P0139 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Malfunction Indicator Lamp
O2S 2 Signal, Stuck Rich
Fault symptom
Malfunction Indicator Lamp
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage greater than 10.5 V. |
| Preheating circuit in normal operating range for more than 20 seconds. |
| 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:
| (See also description of readings/activations in diagnostic tool) |
