Damn o2 sensor
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This is a discussion on Damn o2 sensor within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; i drive an 04 sti, the code read wen the CEL came on was P0171 system too lean bank 1. ...

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    Registered User PRIMAJIN's Avatar
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    Damn o2 sensor

    i drive an 04 sti, the code read wen the CEL came on was
    P0171 system too lean bank 1. Out of the two o2 sensors on the car, how do i find out witch one needs replacing? i need help with this one, thanx alot fellas

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    Is in Love With the Admins Here 20WRX04's Avatar
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    IIRC, bank one is the front one. Bank 2 being the rear one.
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    Registered User PRIMAJIN's Avatar
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    o2 sensor

    awsome that is a huge help bra, do u happen to know the part # for the front sensor?

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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by primajin
    do u happen to know the part # for the front sensor?
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    He simply abides. SD_GR's Avatar
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    Quote Originally Posted by PRIMAJIN View Post
    i drive an 04 sti, the code read wen the CEL came on was
    P0171 system too lean bank 1.
    There is only one bank. "Bank 1" is simply a default.

    Out of the two o2 sensors on the car, how do i find out witch one needs replacing?
    Don't. Instead:

    Clean your MAF.

    If you have an aftermarket air intake, fix it by fitting the factory unit. Check for vacuum leaks and fix them.

    Check the hose to the fuel pressure regulator.

    Check for leaks on the boost side too -- a BOV, incidentally, is a considered a leak -- and fix them.

    In all the instances of a PO171 I've seen, heard of, or read about, I think maybe two (if not just one) turned out to actually be the O2 sensor.

    Search PO171 for troubleshooting tips.

    For example:
    P0171 CEL Thread - Everything you ever wanted to know? - NASIOC

    If it turns out you cannot ID the problem, only then would I beg/borrow/steal a spare O2 sensor, fit it, and see if the CEL goes away. If it does not, go back to Step 1 and forget about the sensor (since that's not the issue).
    Last edited by SD_GR; 08-19-2008 at 12:26 PM.
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  7. #6
    Is in Love With the Admins Here 20WRX04's Avatar
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    ^^^ +1 on what SD_GR said.
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