Why do I have the check engine light on but no codes can be read?
I replaced the front cat with a Magnuflaw cat and the upstream sensor with
a Bosh upstream sensor because I had a code P0421. I drove the car for
about 10 miles after I finished replacing the parts and the check engine
light came on. I took it to autozone inmediately for a code reading but the
computer said there is no code reading and the check engine light still on.
What should I do? The car seams to be doing ok.
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