05 545i increased emissions help!!
i had increased emissions light came on and the car was shaking also said overload may damage catalytic converter. i had it checked out and replaced 2 ingition coils that was miss firing and spark plugs. it was working fine then it came back on and shakes a little bit again and now its missing on 5 and said something about the secondary air something? i used the inexpensive spark plugs also, what do you suggest if anything , any advice will help thank you