girlfriend brought car to dealership because of misfiring with a check engine light and a rattle, cat was bad, I replaced it with a OEM piece fixed misfires for quite sometime now problem it quite persistent on hard acceleration.
also got a code from the dealer of an air switchover valve faulty? not sure if that is for some sort of secondary air injection or what.
I need some tips since I am a VW tech my scantool doesnt tell me crap.
any info or insight on easy tests or common problems, all suggestions welcome
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