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Has my exhaust system been properly installed

(1999 Pontiac Grand Am)
in Westlake, OH on February 15, 2011
had to replace entire exhaust system if there is a problem
with inproper instalation would that cause my check engine light to come on? exhaust still seems loud
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Popular Answer
on February 15, 2011
if there are leaks and depending where, it could draw air into the system and the o2 sensor could read high oxygen. that would cause a light.
also, if the cat converter is not original equipment then that would set a light as well.

Roy
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