P0131

P0131 00

O2S Circuit. Low Voltage. Sensor 1.







Fault symptom
- Check Engine

On-board diagnosis

Type of diagnosis:
- Continuous

Enable criteria:
- Battery voltage must be between 11 - 16 V.
- Engine running.
- No fuel shut-off.
- Secondary air pump not active, if fitted.
- EVAP, leak diagnosis not active, if OBDII.
- Preheating active for more than 4 s.
- Lambda control active for more then 5 s.

- NONE of the following DTCs must be detected:
- P0101, P0102, P0103

Fault criteria:
- When voltage across oxygen sensor 1 is less than 100 mV while voltage across oxygen sensor 2 is more than 700 mV for more than 30 s.

Dependent:
- None

System reaction to a fault:
- Closed loop is blocked.
- Preheating of oxygen sensors 1 and 2 is stopped.
- Fuel adaptation is reset and switched off.

OK report:
- Fault criteria NOT fulfilled for 31 s.

Fault handling:
Type III
(See section Fault handling III, "Other emission-related components and functions" for more information.)

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:
- O2S 1
- Closed Loop
(See also description of readings/activations in diagnostic tool)