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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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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.

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