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Dan, Technician
Category: Cadillac
Satisfied Customers: 24209
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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2006 cadilac sts v6 6.3 I have a diagnostic code P0420 P0430

Customer Question

2006 cadilac sts v6 6.3
I have a diagnostic code P0420
I haave been told that I must replace both catalytic converters. I don't believe it
Submitted: 1 year ago.
Category: Cadillac
Expert:  Dan replied 1 year ago.
Hello, my name is ***** ***** I'm here to help get your problem solved. I agree that your converters are the most likely cause. How does vehicle run? Do you have any exhaust leaks?
Customer: replied 1 year ago.
vehicle runs fine. quite some time after the diagnostic code showed up, (about a month) engine began toidle just a little rough
Customer: replied 1 year ago.
could it be just the sensors?
Expert:  Dan replied 1 year ago.
It could but VERY unlikely. Does vehicle seem to get poor gas mileage or burn oil?
Customer: replied 1 year ago.
not at all, infact I'm a little surprised at how good the mileage has been so far
Expert:  Dan replied 1 year ago.
You can try a converter burn out procedure which involves disconnecting 1 coil on each bank then running engine at 3000 rpm for 5 minutes. Then reset codes, sometimes this will help. If this doesn't help I myself would probably just deal with the lights. It will not cause any problems, just have to look at the light. Let me know how it goes or if you have more questions, thanks.