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P1139 Diagnostic Trouble Code Discussion for June 2011

Air Fuel Sensor (Bank 1 Sensor 1) Circuit Performance


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Trouble Ticket Help Requests for DTC P1139
Help Request Posted
1997 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5297V
P1139: Heated Oxygen Sensor (Bank 1 Sensor 2) Insufficient Switching. Getting codes P0137 and P1139. Have followed the trouble trees for the codes to no avail, all wiring checks out and a new pcm was installed but it didn't fix the problem. The precat O2 sensor will stay at .080 volts and occassionally will switch like the upstr...
June 20, 2011
1997 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5297V
P1139: Heated Oxygen Sensor (Bank 1 Sensor 2) Insufficient Switching. Getting codes P0137 and P1139. Have followed the trouble trees for the codes to no avail, all wiring checks out and a new pcm was installed but it didn't fix the problem. The precat O2 sensor will stay at .080 volts and occassionally will switch like the upstr...
June 20, 2011