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ME9 / P0131 00

Read the instructions below then start the fault diagnostic procedure.

  P0131 00


O2S 1 Circuit, Low Voltage



On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage should be between 10.7 and 16 Volts.
Engine running.

Fault criteria:

One or more sensor leads (pins 3, 19, 35 & 52 on ECM) short circuited to ground for more than 25 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:

Electrical fault in connecting leads or component.

Functions in the diagnostic tool related to the fault:

Test value:
Requested O2S1 Lambda
O2S 1 Lambda
O2S1 Pump Current
O2S 1 Preheating
Closed loop lambda control status
Closed Loop
Total Fuel Trim

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