well i recently just put on downpipes and a catback on my car and i had no check engine lights before this install and when i get done the CEL pops on and i read it for codes im guessing it was the rear o2 sensors and the defoulers werent working but all im getting are mass air flow sensor codes and a primary o2 pre cat with no activity would changing an exhaust cause these to go bad or did they just go bad from age and wear please help and if anybody has a bosch MAF they wanna get rid of pm me TIA for help
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