T8 / P0031 00
Read the instructions below then
start the fault diagnostic procedure.
Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)
O2S 1 Preheather Circuit, Open/Short to Ground
Fault symptom
Fault indicator lamp (for further information see WIS Fault diagnosis, general)
On-board diagnosis
Type of diagnosis:
Enable criteria:
| Battery voltage must be between 11 - 16 V. |
| NONE of the following DTCs must be detected: |
Fault criteria:
| When current is below 1500 mA for more than 6 s. |
Dependent:
System reaction to a fault:
| Preheating of oxygen sensors 1 and 2 is stopped. |
| Fuel adaption is blocked. |
| Adaption of rear oxygen sensor is blocked and reset. |
OK report:
| When fault criteria NOT fulfilled for 7 s. |
Fault handling:
| (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:
| (See also description of readings/activations in diagnostic tool) |
