I have a 2000 chevy Malibu with code P0420 it runs good it just feels like the rev changes when I press on the break & stop completely it also smells a lot like gas when I turn it off any ideas?
Could be any number of things..http://www.obd-codes.com/p0420
Your catalytic converter is no good. Your gas mileage is probably horrible. Some States you can put in a test pipe and sell your old converter for scrap.
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