P1142
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
O2S Heater Circuit. Current too High, 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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Test 1: Engine running. Main relay voltage exceeding 10V. Pre-heating active.
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Test 2: Engine running. Main relay voltage exceeding 10V. Pre-heating active for more than 60 s.
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Fault criteria:
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Test 1: Output voltage exceeding 2V for more than 5 s.
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Test 2: Current exceeding 2300 mA for more than 5 s.
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Dependents:
System reaction to a fault:
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Oxygen sensor affect on closed loop zeroed.
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OK report:
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Enable criteria fulfilled. Fault criteria for P1141 or P1142 not fulfilled within 60 s.
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Fault handling:
(See “Fault diagnosis, general” for more information.)
Diagnostic help
Fault diagnosis concerns electrical faults in connected leads or in the sensor.
Diagnostic tool functions related to this fault are:
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Diagnostic status for the diagnosis.
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Activation of output for preheating.
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Oxygen sensor pre-heating current, unit mA.
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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.
See also the description of activating functions under ”Fault diagnosis, general” for more information.
