1st Gen R53 Cooper S Help with CEL codes

Discussion in '1st Generation: 2002–06 R50, R53 & 2004–08 R52' started by MCS02, Nov 30, 2009.

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  1. MCS02

    MCS02 Moderator
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    Jul 31, 2009
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    Hi
    I have a 02 S I'm getting two codes. they are; P2096 Post Catalyst Fuel Trim System Too Lean Bank 1, and P2270 O2 Sensor Signal Stuck Lean Bank 1 sensor 2.
    I have OBX headers and a after market exhaust. both have been on the car about a year.
    I'm not sure if its a leak in front of the post cat O2 sensor or a bad cat or a bad O2 sensor.
    Can any help
    Thanks Lee :mad2:
     
  2. xalfa

    xalfa New Member

    Nov 24, 2009
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    FWIW, I got the second code after my stock header cracked at the weld below the pre-cat and was leaking badly.
     
  3. MCS02

    MCS02 Moderator
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    Thanks I haven't got under the car to check for leaks yet. The check engine light came on a few days ago. I didn't have time to check it at the time, after a few trips it went out. The CEL came back on tonight. The car was cold and I had only gone a few miles, as soon as on got on the highway it came on again.
     
  4. MCS02

    MCS02 Moderator
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    I checked for leaks today did not find one, changed the oil, ran the car the light is out.
    Must be a short.
     
  5. Nathan

    Nathan Founder

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    Check the wiring to the O2 Sensors to make sure they are not rubbing on the header or heat shielding.
     
  6. NC TRACKRAT

    NC TRACKRAT New Member

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    Has the code/s come back? Are you running w/o a cat?
     
  7. Tummi_Gummi

    Tummi_Gummi New Member

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    im without a cat. and having same issues. At first it was cat effeciency code and p0130 o2 sensor circuit(bank 1 sensor 1). I put an L spacer in my 2nd o2 sensor to clear out the effeciency code and now i have p0130 still and a p2270 o2 sensor signal stuck lean bank 1 sensor 2
     
  8. Tummi_Gummi

    Tummi_Gummi New Member

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