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Thread: oxygen sensor question?

  1. #1
    Join Date
    Jan 2004
    Location
    freezin ass cold WI formerly freezin ass cold MN
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    311

    Default oxygen sensor question?

    Hey, check engine light came on yesterday. Stomp test showed 1221. Does that mean both 02 sensors are bad? or just one?. Car just turned 80,000 miles last week. I knew something would go wrong. It seems to run fine- how soon do I need to replace one or both sensors? What's the danger in waiting?
    95 540 six speed, Rondell 58 wheels, nothin else special
    79 911 SC - pea soup green

  2. #2
    Join Date
    Dec 2003
    Posts
    597

    Default

    I had mine replaced earlier this year after receiving the code. The only thing that I saw change after it failed was my mpg dropped a few...like 5 or 6. :P After replacing the failed one everything returned to normal.

    Maybe Bill or Winfred could chime in but I think replacing both while you're under there isn't a bad idea. If you have an indy who works on your car he might be able to pull the codes to see which sensor did fail.

  3. #3
    Join Date
    Dec 2003
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    Eastern Tennessee USi
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    14,839

    Default

    Clear the codes and see if they come up again, my car did the code thing and I cleared them and havent had a code since...some kink of fluke I guess. If you wait and it is bad you will notice worse mileage and sometimes an erratic idle or stalling etc.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4
    Join Date
    Jan 2004
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    4,150

    Default On the v8 i would replace both to be on the safe side, the only danger in

    waiting is that an overly rich mixture will overheat the cats and cause them to go bad... pretty common on the v8 and pretty spendy too... When you hear those cats rattling you know you waited too long...





    Quote Originally Posted by scott540
    Hey, check engine light came on yesterday. Stomp test showed 1221. Does that mean both 02 sensors are bad? or just one?. Car just turned 80,000 miles last week. I knew something would go wrong. It seems to run fine- how soon do I need to replace one or both sensors? What's the danger in waiting?

  5. #5
    Join Date
    Jan 2004
    Location
    freezin ass cold WI formerly freezin ass cold MN
    Posts
    311

    Default

    Thanks Yeah, I know the sound. Had and 85 Audi 5000 with a bad cat. Not a nice sound. Wasn't nice either when the PS rack went, the wheel bearing went and the transmission started smoking either
    95 540 six speed, Rondell 58 wheels, nothin else special
    79 911 SC - pea soup green

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