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Registered
Join Date: Dec 1969
Location: Dade County, FL.
Posts: 1,145
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OBD-II cars have an O2 sensor before and after the cat (or pair of cats, you can have up to four cats on a twin exhaust system).
1st make sure the O2 sensor isn't shot. If you used any non-sensor safe RTV or fuel addatives it might have coated the O2 sensor enough to trip the CEL.
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93 Lightning
76 912e
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