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Thread: 1221 Error - Need Help Please

  1. #1
    Join Date
    Dec 2015
    Location
    Eugene, Oregon, USA
    Posts
    2
    My Cars
    1995 BMW 525 Touring

    1221 Error - Need Help Please

    Recently purchased a 95 touring from my elderly neighbor. Check engine light was on, when I purchased it, code is 1221 (Oxygen Sensor #1).

    I have replaced the oxygen sensor and the MAF.

    After 20 minutes or so, check engine light comes back on and the fuel then runs super lean.

    Searched the forum and other websites. No clue what to check/replace next.

    Any ideas?

  2. #2
    Join Date
    Jan 2015
    Location
    Tempe, AZ
    Posts
    7,658
    My Cars
    1995 525i/5
    Check your fuel pump, it could be starting to fail as it gets hot. I had the same problem when I had a failing pump.
    1995 525i 5-speed - Thread

  3. #3
    Join Date
    Dec 2020
    Location
    San Jose, CA, USA
    Posts
    718
    My Cars
    1994 "532i6", 1998 528iT
    I threw out the whole fuel system chasing this. Fuel pump, fuel filter, lines, fuel pressure regulator, injectors, and even a compromised harness can all cause insufficient fuel delivery.

  4. #4
    Join Date
    Jan 2005
    Location
    Japan
    Posts
    54,655
    My Cars
    11/88 E32 750iL+98 E36M3
    Last edited by shogun; 07-26-2023 at 10:12 PM.
    Shogun tricks and tips for the E32 series are HERE!

  5. #5
    Join Date
    Dec 2015
    Location
    Eugene, Oregon, USA
    Posts
    2
    My Cars
    1995 BMW 525 Touring
    Quote Originally Posted by dannyzabolotny View Post
    Check your fuel pump, it could be starting to fail as it gets hot. I had the same problem when I had a failing pump.

    Hahahaha...after 3 hours of searching I found your killer thread and the post about the 1221 code. Pump ordered my friend!

    - - - Updated - - -

    Thank you! I hadnt found those yet.

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