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2004 monte carlo, 2 codes


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waylon83
User

Mar 14, 2011, 7:57 PM

Post #1 of 4 (5362 views)
2004 monte carlo, 2 codes Sign In

2004
Chevy
Monte Carlo
3.8L Not super charged
104,000

I am getting these engine codes:
P0420
P0455

Whats my best bet at figuring out what the problem is?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 14, 2011, 8:09 PM

Post #2 of 4 (5355 views)
Re: 2004 monte carlo, 2 codes Sign In

You probably left the gas cap loose for the PO455 and the PO420 means you most likely need a new catalytic converter.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



waylon83
User

Mar 14, 2011, 8:17 PM

Post #3 of 4 (5350 views)
Re: 2004 monte carlo, 2 codes Sign In

Gas cap isnt loose, ive had that code for a while now, have a new gas cap on now from the dealer. Is there a way to check the catalytic converter or do I just replace it and hope?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Mar 15, 2011, 5:17 AM

Post #4 of 4 (5348 views)
Re: 2004 monte carlo, 2 codes Sign In

If it's not the gas cap, then you have a major leak elsewhere in the system and you will need a smoke machine to find it. As for the Converter, there is no good way to test it.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







 
 
 






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