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Help With DTC PO420

This is a discussion on Help With DTC PO420 within the V6 forums, part of the Vehicle Specific category; While Driving my girlfriends car today, thew CK engine light came on I took it home and used my handy ...

  1. #1

    Help With DTC PO420

    While Driving my girlfriends car today, thew CK engine light came on I took it home and used my handy OBII scanner and found this DTC PO420 just wondering if anyone one on this site has has the same fault or could help thanks a bunch I think the fault is for A Cat Bank 1 Problem

  2. #2
    I swear it's just a v6!
    Join Date
    Jul 2001
    Location
    Westwood, NJ
    Age
    41
    Posts
    127

    Silver
    1997 Firebird V6

    I'll look it up later when I'm out of work

  3. #3
    Alcohol Injected PaganEgyptian's Avatar
    Join Date
    Nov 2005
    Location
    Knoxville,Tn
    Age
    41
    Posts
    139

    Black
    1999 Pontiac Firebird

    Catalyst below effeciency.
    Here is a good site to take a look at...

    http://www.obdii.com/codes.html

    Sometimes aftermarket Converters will throw that code. If you live in a non-emmisions testing state, I would remove the converter and use a Caspers O2 Simulator. It will not affect performance unless it has a Good Luck -Tim
    Last edited by PaganEgyptian; 12-08-2005 at 01:13 PM.

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