Thread: Removing rear O2 sensor on 01-newer PCMs -- Things you should know

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  1. #1 Re: Removing rear O2 sensor on 01-newer PCMs -- Things you should know 
    GTP Level Member 01gpgt01's Avatar
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    You will be okay with the 02 in there, It will just toss the Po420 code. If you have that code set to Non report SES enabled Checked, Then it would even pass a obd2 Emission check.
    2001 GT. A few here and there mods http://www.streetfire.net/video/2001...ynp_208097.htm

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  2. #2 Re: Removing rear O2 sensor on 01-newer PCMs -- Things you should know 
    GTP Level Member apierce1289's Avatar
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    Quote Originally Posted by Sinister Performance View Post
    That's a good question. I don't know what would happen if you got rid of the cat and left the rear O2 in there. The Monte I tuned on didn't have a rear O2 or a cat so I never got to try it.

    I would say go ahead and try disabling the catalyst codes only (leave the post-O2 codes enabled) and then watch your fuel trims as you drive and see if it tries to run the cat diagnostic. It may try to run it but should soon quit running it as the rear O2 would show rich immediately as the test begins.

    Give it a try and let us know what happens.

    -ryan

    Quote Originally Posted by 01gpgt01 View Post
    You will be okay with the 02 in there, It will just toss the Po420 code. If you have that code set to Non report SES enabled Checked, Then it would even pass a obd2 Emission check.
    So if i do what you guys just suggested the car will only run the diagnostic once and should stop then my engine should remain running normal. The computer will just think it has a bad CAT and it wont effect the way the engine runs? Oh and also i don't have the software i am just doing a **** load of research to find a solution to this issue. Will the above SES code try to run more than once? So that me and everyone else will know what to do
    Last edited by apierce1289; 04-02-2011 at 11:59 PM.
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  3. #3 Re: Removing rear O2 sensor on 01-newer PCMs -- Things you should know 
    SE Level Member Sinister Performance's Avatar
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    Quote Originally Posted by apierce1289 View Post
    So if i do what you guys just suggested the car will only run the diagnostic once and should stop then my engine should remain running normal. The computer will just think it has a bad CAT and it wont effect the way the engine runs? Oh and also i don't have the software i am just doing a **** load of research to find a solution to this issue. Will the above SES code try to run more than once? So that me and everyone else will know what to do
    Assuming you are going to leave the rear O2 installed and the codes for it enabled (as they are stock); if you set the Cat Diagnostic DTC(s) to "No MIL", the test will run 1 time, set the Cat DTC, and then future tests will not run.

    If you disable the Cat diagnostic codes completely, the PCM may attempt to run and re-run the tests, but I would THINK it should immediately discontinue each test as soon as it sees that rear O2 sensor go rich. I do NOT know if it will keep trying to run the test of if it will discontinue running tests for that key cycle because I never had the chance to try it.
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  4. #4 Re: Removing rear O2 sensor on 01-newer PCMs -- Things you should know 
    youtu.be/xhrBDcQq2DM FoSHO99's Avatar
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    In tinytuner, go to diagnostics> cat diagnostics? and there are 2 tests to set to disable, I'm not at the program right now for specifics but I know they will disable the tests.

    Other than that if you leave the rear 02 plugged in and in the exhaust, you can make a 2" or so spacer so the sensor is out of the exhaust stream and then it won't throw a code like it would with no cat there and in the exhaust stream.
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  5. #5 Re: Removing rear O2 sensor on 01-newer PCMs -- Things you should know 
    SE Level Member Sinister Performance's Avatar
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    Quote Originally Posted by FoSHO99 View Post
    In tinytuner, go to diagnostics> cat diagnostics? and there are 2 tests to set to disable, I'm not at the program right now for specifics but I know they will disable the tests.

    .
    What version of TinyTuner are you using? I have v3 and it isn't showing any cat diagnostics to disable at all...
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