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Thread: Check Engine Code 1221-->Replace O2 Sensor?

  1. #1

    Default How To Turn Off Check Engine Light?

    Am I right in assuming that Code 1221 pretty much means replace O2 sensor? After I put in a new sensor, how do I turn off the Check Engine light?

    The Bentley manual (100-8) says:

    ...When all fault codes have been displayed, there will be a 0.5 second flash and then the light will remain off.
    ...

    To erase the fault code memory, first make sure the fault code 1000 (....) is present, then depress the throttle fully for at least ten seconds.


    http://www.bmwe34.net/e34main/trouble/engine_codes.htm says the same.

    I'm just not getting a Code 1000. Instead Code 1221 keeps cycling indefinitely. What am I doing wrong? Is there an updated procedure for the 95s? I guess I could always disconnect the battery, but that's a pain.

    Thanks.
    Last edited by Eric Fraser; 09-16-2004 at 10:55 PM.
    Eric Fraser
    1995 525i Auto 102k miles
    =========================

  2. #2
    Join Date
    Dec 2003
    Posts
    835

    Default

    look for vacuum leaks on the intake. The dme is trying to bring the mixture into the proper range with the unmetered air to the intake.
    erased due to slander

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

    Default

    are you saying that you DID change the O2 sensor or are going to?
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  4. #4

    Default

    going to...
    Eric Fraser
    1995 525i Auto 102k miles
    =========================

  5. #5
    Join Date
    Dec 2003
    Location
    Eastern Tennessee USi
    Posts
    14,839

    Default ok, check light will stay on til the probems gone,

    the code will clear itself after 50 starts with no problems.
    95 E34 530I V2.37
    ===========
    Those who make peaceful revolution impossible will make violent revolution inevitable.

    John F. Kennedy

  6. #6

    Default

    Thanks. I'll look for vacuum leaks, but I think that at 103kmiles on original O2 sensor, replacing it seems like a good place to start...

    Quote Originally Posted by Martin in Bellevue
    look for vacuum leaks on the intake. The dme is trying to bring the mixture into the proper range with the unmetered air to the intake.
    Eric Fraser
    1995 525i Auto 102k miles
    =========================

  7. #7

    Default great, thanks

    Quote Originally Posted by 632 Regal
    the code will clear itself after 50 starts with no problems.
    Eric Fraser
    1995 525i Auto 102k miles
    =========================

  8. #8
    Join Date
    Jan 2004
    Location
    freezin ass cold WI formerly freezin ass cold MN
    Posts
    311

    Default

    Eric, I had the same code a few weeks ago. I replaced the o2 sensor(s) and the light went out first time I started it after the replacement
    95 540 six speed, Rondell 58 wheels, nothin else special
    79 911 SC - pea soup green

  9. #9
    Join Date
    Dec 2003
    Location
    Los Angeles
    Posts
    197

    Default

    I have to do the same thing this weekend.

    Are the O2 sockets still available at autozone for rental?
    dave b
    93 525i
    156k +

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