Question about 1997 Cadillac DeVille

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Can anyone tell me what the following codes are on my 1997 Cadillac Deville?? P0139, P0603, P1139, and P1599.....

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Luke Bradford

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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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  • Anonymous Oct 14, 2010

    So I have a problem with my car starting up sometimes, it hesitates and sounds like it trying to start then it stalls out then i crank it again and it will usually start with a lil smoke coming from the exhaust... none of these codes seem to be that specific problem, and where is the catalytic converter located???

  • Luke Bradford
    Luke Bradford Oct 14, 2010

    Just so we can narrow it down, have you disconnnected the battery before to try and erase the codes ???

  • Anonymous Oct 14, 2010

    Yes I disconnected and drove it till the service light came back on. Then I went and had the codes read. Im trying to figure out what could be at fault for the car starting like that and now also wondering if i need a new catalytic converter and if that could be at fault.

  • Luke Bradford
    Luke Bradford Oct 14, 2010

    I hope I get a good rating from the catalytic converter is in the exasut and normally betwwen the exhasut manifold and the mufler but it is more towards the front of the is oval in shape, amnd inside has a honeycomb centre......this is the membranes that break down carbon monoxide into water and oxygen.......well, thats the way tis supposed to work



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Try checking that wire to see if its getting juice.
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