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  1. #1
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    55c Thermostat and OBDII Drive cycle monitors ( State inspection)

    Just an FYI..

    After weeks of diagnostics, head scratching and cursing, I have discovered the 55c thermostat does in fact create problems for the OBDII drive cycle monitors.

    If you live in a State that requires OBDII plug in, have a 55c stat and are having problems passing inspection.. replace the stat with the OEM 80c. The 55c stat prevents the motor from heating up quickly enough to meet the OBDII test parameters. It will also cause a "pending" P0128 code which will become active during an OBDII test once you have managed to pass all drive cycle tests.

    Hopefully this post will help a few folks in the future who have the same problem I did.

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    Click here to enlarge Originally Posted by ccsykes Click here to enlarge
    Just an FYI..

    After weeks of diagnostics, head scratching and cursing, I have discovered the 55c thermostat does in fact create problems for the OBDII drive cycle monitors.

    If you live in a State that requires OBDII plug in, have a 55c stat and are having problems passing inspection.. replace the stat with the OEM 80c. The 55c stat prevents the motor from heating up quickly enough to meet the OBDII test parameters. It will also cause a "pending" P0128 code which will become active during an OBDII test once you have managed to pass all drive cycle tests.

    Hopefully this post will help a few folks in the future who have the same problem I did.
    That code can be deactivated, AA did it for me when I had their tune/kit.

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    Click here to enlarge Originally Posted by MSpiredM3 Click here to enlarge
    That code can be deactivated, AA did it for me when I had their tune/kit.
    Who else deactivates it? He has the GIAC tune so it seems they do not do it.
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    Click here to enlarge Originally Posted by ccsykes Click here to enlarge
    Just an FYI..

    After weeks of diagnostics, head scratching and cursing, I have discovered the 55c thermostat does in fact create problems for the OBDII drive cycle monitors.

    If you live in a State that requires OBDII plug in, have a 55c stat and are having problems passing inspection.. replace the stat with the OEM 80c. The 55c stat prevents the motor from heating up quickly enough to meet the OBDII test parameters. It will also cause a "pending" P0128 code which will become active during an OBDII test once you have managed to pass all drive cycle tests.

    Hopefully this post will help a few folks in the future who have the same problem I did.
    That is a nice tip Click here to enlarge
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    ya'll do OBD testing in houston? glad we dont do that here in SA
    Click here to enlarge Originally Posted by TwinturboM3
    I bang the chickens on my farm 60-130 times a day.
    Click here to enlarge

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Who else deactivates it? He has the GIAC tune so it seems they do not do it.
    GIAC won't do it just like they won't turn off the rear O2's. I'm sure OE Tuning can do all this as well.

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    Click here to enlarge Originally Posted by MSpiredM3 Click here to enlarge
    GIAC won't do it just like they won't turn off the rear O2's. I'm sure OE Tuning can do all this as well.
    Why won't they do it?
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Why won't they do it?
    They don't really have full control of the DME? I kid i kid

    They don't like to do "custom" things or out of the box stuff, just cookie cutter.

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    Click here to enlarge Originally Posted by MSpiredM3 Click here to enlarge
    They don't really have full control of the DME? I kid i kid
    say what...lol you mean you cant shut off codes with a resistor.....damn!
    Click here to enlarge Originally Posted by TwinturboM3
    I bang the chickens on my farm 60-130 times a day.
    Click here to enlarge

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    Click here to enlarge Originally Posted by MSpiredM3 Click here to enlarge
    GIAC won't do it just like they won't turn off the rear O2's. I'm sure OE Tuning can do all this as well.
    If you turn certain testing criteria off, then it will still fail OBDII drive cycle tests. For example if you disable the rear O2's, the OBDII tests won't preform so you will show a "not ready" for catalyst. You are allowed one "not ready" test however in Texas for cars older than 2002.

  11. #11
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    Oh, I know you won't pass OBDII if you tirn off the rear O2's, O2 sims would probably work though. But you can get rid of the car not reaching operating temp code and that should be able to not show up and help pass the scan.

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