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 condition for this diagnostic trouble code: Atmospheric pressure must exceed 72 kPa as well as 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 above 150 mg/c. Coolant temperature higher than 60°C, closed loop active more than 5 s, closed loop between 20 and -20%, no fuel shut-off.
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Fault criteria:
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Voltage below 0.07 V for more than 60 s.
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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:
(For more information, see
Fault handling III, other emission-related components and functions
.)
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
Menu "Read Values"
.
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Note
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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.
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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.
