SAAB WIS ONLINE

T8 / P0140 00

Read the instructions below then start the fault diagnostic procedure.

Symptom: Fault indicator lamp (for further information see WIS Fault diagnosis, general)

  P0140 00


O2S Circuit. No Activity Detected. Sensor 2.

Fault symptom

Fault indicator lamp (for further information see WIS Fault diagnosis, general)

On-board diagnosis

Type of diagnosis:

Continuous

Enable criteria:

Battery voltage must be between 11 - 16 V.
Engine running (with at least 7700 combustions).
Preheating active for more than 4 s.
Lambda control active for more then 5 s.
Fuel shut-off for more than 7 s.

Fault criteria:

When voltage across sensor has not been below 400mV after a 7 second fuel shut-off.

Dependent:

None

System reaction to a fault:

Preheating is switched off.
Adaption of rear oxygen sensor is blocked and reset.

OK report:

Diagnosis completed without fault report.

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.
The voltage across a defective sensor is 0.40V - 0.50V. OK if it exceeds 0.55V.

Functions in the diagnostic tool related to the fault:

Test value:
O2S 2

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