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OBDII Live scan results & bad a/f (pre cat) sensor

Discussion in '1st Gen. Tacomas (1995-2004)' started by Kristi with a K, Jul 15, 2022.

  1. Jul 15, 2022 at 7:32 AM
    #1
    Kristi with a K

    Kristi with a K [OP] Well-Known Member

    Joined:
    Nov 19, 2017
    Member:
    #236406
    Messages:
    2,706
    Gender:
    Female
    Western MA
    Vehicle:
    01' Black (was Maroon, then red) Tacoma 4x4 SR5 ACab 3.4L AT
    G-Men sticker, driver's side "backseat" window - cracked driver's side headlight cover complete with hazy look - DIY 30 footer paint lift in Bedliner Black
    Finally got an OBD2 tool & am trying to learn what the feedback means as far as my next steps in troubleshooting said engine.
    So far I see my timing is off, the bank 1 sensor 2 is all over the place while idling, stuck in a closed loop, etc.
    I’m sure there’s much more to interpreting the info than jumping in & changing out parts because of the live results.
    Which brings me to my question. I pulled the a/f bank 1 sensor 1 (before cat). I was kicking myself for not doing this when I manually cleaned the carbon out of the valves/intake/etc. Anyway, I thought it would be covered in black. It was not. Did a resistance test & it was .02 at room temp. “03 manual has it at .8-1.4 at 68 degrees. So it looks like one piece of my puzzle may be solved.
    Question you say? Would this or anything else affect a timing live data reading? I get that I can manually go in & check the timing. That is of course a bigger job & if there are other possible reasons for this scan result, it’d make sense to look at those.
     

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