P0420 code

Asked by Mar 13, 2012 at 11:21 AM about the 2006 Pontiac Grand Prix

Question type: General

Code goes on for a week and off for a week, I took it to    
the shop and they said I had a bad gasket that
connects the converter to the muffler,they fixed it but
light is back on...help!!!

1 Answer

you could have a bad 02 sensor at the CAT or your CAT is bad. Cats don't usually connect to the mufflers, but if the gasket was leaking at the CAT it could have damaged the CAT.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 3,770
#2 Tom Demyan
Tom Demyan
Reputation 2,520
#3 munron
munron
Reputation 2,010
View All

Related Models For Sale

Used Chevrolet Impala
945 Great Deals out of 36,275 listings starting at $1,800
Used Dodge Charger
548 Great Deals out of 28,867 listings starting at $2,275
Used Pontiac Bonneville
669 listings starting at $2,298
Used Chevrolet Monte Carlo
18 Great Deals out of 1,724 listings starting at $1,695
Used Pontiac G6
138 Great Deals out of 4,949 listings starting at $999
Used Pontiac Grand Am
1,723 listings starting at $1,995
Used Chevrolet Malibu
1,102 Great Deals out of 79,336 listings starting at $2,495
Used Pontiac GTO
7 Great Deals out of 491 listings starting at $5,900
Used Chrysler 300
499 Great Deals out of 20,814 listings starting at $1,500
Used Ford Mustang
696 Great Deals out of 38,428 listings starting at $1,963
Used Jeep Grand Cherokee
1,137 Great Deals out of 69,559 listings starting at $495
Used Nissan Maxima
419 Great Deals out of 25,110 listings starting at $1,500
Used Chevrolet Tahoe
1,078 Great Deals out of 31,862 listings starting at $1,495

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
12 Great Deals out of 461 listings starting at $1,995
2007 Pontiac Grand Prix For Sale
524 listings starting at $2,000
2006 Pontiac Grand Prix For Sale
7 Great Deals out of 622 listings starting at $2,000
2005 Pontiac Grand Prix For Sale
434 listings starting at $3,800