Hi all,
I have a '99 Jimmy that just tripped the SES light. The code was a P0420 - Catalyst System Efficiency Below Threshold (Bank 1). I can hear a loud rattle at the Catalytic Converter, so I am pretty sure it is hosed. It has about 120k miles on it...so I think it is about time to be replaced. Anyone have any suggestions as to what all to replace or how much it should cost??? Should I go for the whole exhaust system, or just cut out and weld in a new Cat?
It is my wife's car, so she is going nuts bugging me about it. How serious is a problem like this?
Thanks,
Damian