Thread: 2001 grandprix gt p0446 code..no converter but no P0420 code...

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  1. #1 2001 grandprix gt p0446 code..no converter but no P0420 code... 
    GT Level Member chicagochuck's Avatar
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    2001 grandprix gt

    It had a po420 code about 2 yrs ago, I put in a oxygen sensor pipe entender and the code went out. I also had the resonator removed eventually when it went bad.

    I sold the car to a family member oct 2015... In may of 2016 the straight pipe where the resonator/straight pipe was welded to the downpipe cracked. SO I told him to go get a straight pipe re welded where it was originally attached

    Fast forward to today I'm working on the car trying to figure out the po446 , I changed the vent valve but code still remains. I also noticed that the exhaust is stronger than I remember. I get under the car and the converter is gon as well, its straight piped all the way to the mufflers. crazy things is its not throwing a p0420 code at all.

    I guess i should have went with him to the exhaust shop, not sure if it'll be a problem but Im sure thats not what he really wanted done.

    Didn't think that would be possible to not throw the 420 code. Just wanted to share that story
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  2. #2 Re: 2001 grandprix gt p0446 code..no converter but no P0420 code... 
    SE Level Member khornocker's Avatar
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    regarding the P0446 code. is it hard to put gas in the car. I had the same code for a while but I couldn't fill my tank, when I changed the vent valve it didn't fix my issue. my problem ended up being my charcoal canister that's mounted on top of the gas tank.
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