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P0140

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE. Possible misfiring before DTC is generated.

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°C.

- Engine running. Closed loop active. Coolant temperature above 70°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: (See “Fault diagnosis, general” for more information.)


- 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.


See also the description of test values under ”Fault diagnosis, general” for more information.

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.