Fault Conditions

P0131

O2S Circuit. Low Voltage. Sensor 1.







Fault symptoms
- CHECK ENGINE.
- Possible misfiring before DTC is generated.

On-Board Diagnostics

Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.

Enable criteria:
- General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperature must exceed -7 degree C.
- Engine running. Main relay voltage exceeding 10 V. Oxygen sensor 2 voltage exceeding 0.700 V.

Fault criteria:
- Voltage below 0.025 V for more than 15 s.

Dependents:
- P1135 and P1136.

System reactions to a fault :
- Closed loop control system blocked.

OK report:
- P0134 Test 1 and Test 2 performed once and fault criteria not fulfilled. 60 s has expired and closed loop still active. Fault criteria for P0131 or P0132 not fulfilled.

Fault Handling: (For more information refer to "Fault diagnosis, general". Fault Handling III, Other Emission-Related Components and Function

- Type III.

Diagnostic help
Fault diagnosis concerns electrical faults in connected leads or in the sensor.

Diagnostic tool functions related to this fault are:
- Diagnostic status for the diagnosis.
- Heated oxygen sensor reading, in V.

For more information refer to description of test values under "Fault diagnosis, general". Menu Read Values

NOTE: The oxygen sensor receives reference oxygen from the surrounding air via the connecting cables. For this reason, electrical contact spray or grease must not be used on the oxygen sensor connector.

Check the wiring
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.