P0137
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
O2S Circuit. Low Voltage. Sensor 2.
Fault symptoms
On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria:
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General conditions for this trouble code: Atmospheric pressure must exceed 72 kPa and the engine coolant and intake air temperature must exceed -7°C.
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Engine running. Main relay voltage exceeding 10V.
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Engine load 150 mg/c. Coolant temperature more than 60°C. Closed loop active longer than 5s. Closed loop between 20 and -20%. No fuel shut-off.
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Fault criteria:
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Voltage below 0.07V for longer than 60s.
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Dependents:
System reaction to a fault:
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Transition adaptation of closed loop is blocked.
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OK report:
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P0140 diagnosis performed once and fault criteria not fulfilled. Fault criteria for P0138 not fulfilled.
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Fault handling:
(See “Fault diagnosis, general” for more information.)
Diagnostic help
Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.
Functions in the diagnostic tool related to the fault:
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Diagnostic status for the diagnosis.
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Oxygen Sensor Value, unit V.
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For more information, see “Fault diagnosis, general".
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Note
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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.
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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.
