2005 Deville 02 sensor problems........
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1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2005 Deville 02 sensor problems........ in Past Cadillac Vehicle Discussion; OK folks. My first thread here and I need your help. I received 2 codes on my 2005 Deville -- ...
  1. #1
    KenJ is offline Cadillac Owners Member
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    Red face 2005 Deville 02 sensor problems........

    OK folks. My first thread here and I need your help. I received 2 codes on my 2005 Deville -- P0036 and a P0141. Both codes point to my Bank 1 Sensor 2 O2 sensor. This car only has 1 downstream O2 sensor so I went and replaced it ( after having to drill out the rivets from the heat shield ). I cleared the code and ran the car. After about 10 miles or so the exact same codes came back. After reading other forum posts, several people suggested that the next step would be to check for resistance on the sensor heater and make sure there was a 12 volt feed coming from the car ( with the key turned on ) on the "car side" of the O2 sensor connector. I went back under the car and checked and the sensor had resistance across the heater core leads of the 02 sensor and the car was sending 12 volts from the "car side". I also checked and do not see any fraying or damage of the wires that lead from the O2 sensor back to the ECM. I also read that I should disconnect the ground on the battery. So I disconnected the battery ground, waited over 1/2 hour, reconnected the battery ground, cleared the codes again and restarted and ran the car. Guess what. After only about 10 miles the same 2 code came back.

    I am at a loss at this point. I have tried everything that I know to do and any advice hat folks on the forums have suggested. The only other option I can think of is to replace the ECM, but before I go and spend that fairly large amount of money to do that I figured I would ask the experts here for advice.

    So what do you say folks. Anyone have any suggestions. Any help would be GREATLY appreciated.

    Thanks in advance,
    Ken

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  3. #2
    basscatt's Avatar
    basscatt is online now Cadillac Owners 10000+ Posts
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    Re: 2005 Deville 02 sensor problems........

    Quote Originally Posted by KenJ View Post
    OK folks. My first thread here and I need your help. I received 2 codes on my 2005 Deville -- P0036 and a P0141. Both codes point to my Bank 1 Sensor 2 O2 sensor. This car only has 1 downstream O2 sensor so I went and replaced it ( after having to drill out the rivets from the heat shield ). I cleared the code and ran the car. After about 10 miles or so the exact same codes came back. After reading other forum posts, several people suggested that the next step would be to check for resistance on the sensor heater and make sure there was a 12 volt feed coming from the car ( with the key turned on ) on the "car side" of the O2 sensor connector. I went back under the car and checked and the sensor had resistance across the heater core leads of the 02 sensor and the car was sending 12 volts from the "car side". I also checked and do not see any fraying or damage of the wires that lead from the O2 sensor back to the ECM. I also read that I should disconnect the ground on the battery. So I disconnected the battery ground, waited over 1/2 hour, reconnected the battery ground, cleared the codes again and restarted and ran the car. Guess what. After only about 10 miles the same 2 code came back.

    I am at a loss at this point. I have tried everything that I know to do and any advice hat folks on the forums have suggested. The only other option I can think of is to replace the ECM, but before I go and spend that fairly large amount of money to do that I figured I would ask the experts here for advice.

    So what do you say folks. Anyone have any suggestions. Any help would be GREATLY appreciated.

    Thanks in advance,
    Ken
    =====================
    what brand and part number O2 sensor did you get?

  4. #3
    KenJ is offline Cadillac Owners Member
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    Re: 2005 Deville 02 sensor problems........

    Thanks for the reply..............
    I bought them from eBay at the following link..........
    http://www.ebay.com/itm/370925788779...%3AMEBIDX%3AIT

    It said it was a direct replacement for my car. I usually don't buy online but a friend told me he ordered O2 sensors from am-autoparts before with no issues and with 1,190,935 sales with a 99.8 positive rating, I thought it should be fine.

    Would that cause an issue?

  5. #4
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2005 Deville 02 sensor problems........

    Most of the OEM sensors for these Northstar cars were made by Robert Bosch in Germany. I have a new one here in the garage, and yours (link pictures) looks identical.

    The darn things are extremely critical of good electrical connections - at the PCM and at the body harness > sensor pigtail. DO NOT unduly bend, twist, or crimp the sensor pigtail.

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 2005 Deville 02 sensor problems........


  7. #6
    KenJ is offline Cadillac Owners Member
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    Re: 2005 Deville 02 sensor problems........

    Sub - thanks for the reply.
    I had read that you can't crimp the sensor leads as well. When I installed the new sensor and again when I went back and rechecked it, I carefully routed the wires and made sure all loops were gently curved with no hard kinks in the wire.

    I have been investigating this thing for over 2 weeks and really am at a loss at this point. Hopefully one of the folks on this forum has come across a similar issue.

    Thanks again

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