Fault Conditions
P0140
O2S Circuit. No Activity Detected. Sensor 2.
Fault symptoms
- CHECK ENGINE.
- Possible misfiring before DTC is generated.
On-Board Diagnostics
Type of diagnosis:
- Once per driving cycle. Interrupted when fault criteria fulfilled or OK reported. Restarts 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. Closed loop active. Coolant temperature above 70 degree C. Sensor pre-heating active. Vehicle speed above 0. A counter accumulates the time during which all the conditions are fulfilled. Another counter accumulates changes in sensor voltage.
Fault criteria:
- Accumulated voltage transitions less than 500 mV when time counter reaches 500 s.
Dependents:
- P0116, P0117, P0118, P0501, P0502, P1141 and P1142.
System reaction to a fault:
- Transition adaptation of closed loop is blocked.
OK report:
- P0140 diagnosis performed once and fault criteria not fulfilled. Fault criteria for P0138 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.