Question about 1997 Cadillac DeVille
Firstly, they are al P type codes, which refers to PCM.
P0139 - HO2S (Heated Oxygen Sensor) Slow Response Bank 1 Sensor 2. This is is the sensor in front of the catalytic converter.
P0603 - Internal Control Module Keep Alive Memory error. This error normally comes up when the battery is disconnected.
P1139 - HO2S (Heated Oxygen Sensor) Insufficent Switching Bank 1 Sensor 2. (see above)
P1599 - Engine Stall or Near Stall Detected.
I hope this helps.....I would attempt erasing the codes first and see if they come back, and then going from there.
Posted on Oct 14, 2010
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