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P1137

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P1137


O2S Circuit. Low Voltage. Sensor 2.


Fault symptoms


• CHECK ENGINE.


On-Board Diagnostics

Type of diagnosis:


- Continuous. Terminated when fault criteria fulfilled. Restarts next driving cycle.


Enable criteria:


- Engine load over 150 mg/c. Coolant temperature more than 60°C. Preheating active longer than 4s. Preheating current exceeds 300 mA. Closed loop active longer than 5s. Closed loop between 20 and -20%. No fuel shut-off.


Fault criteria:


- O2S2 voltage is between 0.05 and 0.3V for longer than 90s.


Dependents:


- P0137, P0138 and 0140.


System reaction to a fault:


- Transition adaptation of closed loop is blocked.


OK report:


- Enable criteria fulfilled and 120s has expired without a fault report.


Fault handling: (For more information, see Fault handling III, other emission-related components and functions .)


- Type III.


Diagnostic help

Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.

Functions in the diagnostic tool related to the fault:


• Diagnostic status for the diagnosis.

• Oxygen Sensor Value, unit V.


For more information, see Menu "Read Values" .

Note

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.


Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.