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P0135 Diagnostic Trouble Code Discussion for December 2013

Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Performance

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Trouble Ticket Help Requests for DTC P0135
Help Request Posted
2002 Jeep Grand Cherokee Laredo 4.0L MIL Lamp on VIN: 1J4GW48S82
P0135: Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction. Called IDFix line, not a lot of help, this is very intermittent, code sets when below 20 deg, cold soak start, O2's have to drop below 3.0V in 75 sec. O2's are below 3V in 10 sec, swinging in 18 sec, downstreams swinging in 30 sec. Don't know what else to chec...
December 10, 2013