well i got m exhaust done today and when im driing i notice my check engine light is on...i get home check it out and i dont see my o2 sensor...im prolly not looking hard enough but lets say its not there...would this cause the check engine light to go on?

 

Yes it would.... the CEL is usually Emissions related, such as the O2 sensor malfunctioning or not being there...

 

i figured thanks for the quick reply and cool avatar btw