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3800 v6 obdII p0420 code

This is a discussion on 3800 v6 obdII p0420 code within the General Help forums, part of the LSx Technical Help Section category; ok someone please help!! i have an 01 camaro with the 3.8 v6 a couple months ago my ses light ...

  1. #1
    Junior Member coryprine's Avatar
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    pewter
    2001 camaro

    3800 v6 obdII p0420 code

    ok someone please help!! i have an 01 camaro with the 3.8 v6 a couple months ago my ses light came on... i brought it to my mechanic who told me it was the p0420 code. they replaced all three o2 sensors, new high flow converter, and welded up an exhaust leak, AND one new coil pack. No problems for about 3 days, and then BAM the light is back. I went to autozone and it was the same code again. It comes on every couple days and i go have it reset, but its a non stop cycle. Where do i need to go from here because im tring to avoid another $1000.00 repair bill. the car has 115,000 miles on it.

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    Junior Member sreve's Avatar
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    sims or a tune.

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    Member ghettosled's Avatar
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    1999 camaro ss #4288

    0420 means you have a bad cat. im guessing your new high-flow converter isnt working good enough.

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    Veteran 0rion's Avatar
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    Quote Originally Posted by ghettosled View Post
    0420 means you have a bad cat. im guessing your new high-flow converter isnt working good enough.
    that would be my guess also. the sensor isn't liking the high flow cat.

  5. #5
    Junior Member coryprine's Avatar
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    i think i have a leak at my bank 1 "left bank" exhaust manifold.... could this be throwing the code also??

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