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2002
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Grand Cherokee Laredo, 4.0 S, AWD
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Repair and Diagnosis
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Engine Performance
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Engine Controls - Self-Diagnostics
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Diagnostic Tests
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DTC P0136: 1/2 O2 Sensor Heater Circuit Malfunction
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Possible Causes
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Possible Causes
Intermittent Condition
O2 Heater Element
O2 Sensor Heater Relay Supply Circuit Open Or Shorted To Ground
O2 Sensor Heater Relay Control Circuit Open
O2 Sensor Heater Control Circuit Shorted To Ground
PCM