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Wayne Crawford
Wayne Crawford, Shop Owner
Category: Cadillac
Satisfied Customers: 4017
Experience:  General Repair Shop Owner
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Cadillac CTS: I have a p0420 code on a Cadillac CTS 2006. I

Customer Question

I have a p0420 code on a Cadillac CTS 2006. I have been hearing a noise like a bracket is loose for about 2 weeks now.
Submitted: 2 years ago.
Category: Cadillac
Expert:  Wayne Crawford replied 2 years ago.
Hello. My name is ***** ***** I will be helping you today.A p0420 is almost always a bad catalytic converter. The noise you were hearing was probably the guts of the catalytic converter rattling around inside the outer "housing".
Customer: replied 2 years ago.
A catalytic converter going bad in less than 10 years. This car only has 105,000 miles on it. I bought it brand new in Feb 2006. Could it be a bad oxygen sensor instead?
Expert:  Wayne Crawford replied 2 years ago.
I highly doubt it. Out of the 1000 times I have seen that code 995 of them have been bad catalytic converters. Of course you verify the oxygen sensor readings with a scan tool before replacing the cat but history as well as your rattling noise tell me its going to be a bad cat. I would bet my next months pay on it.