05 745i smoking/fault codes. Tech help needed.
I have a 2005 745i that has recently started smoking at idle and under rpm
i have taken it to the Dealer a number of times and the problem has not been fixed. I have a personel code reader that i just hooked up to the car and has come back with the codes
1) P0420- Catalyst Efficiency below threshold
2) P0492- Secondary Air system (bank 2)
3) P0492- Secondary Air System (bank 2) not sure why it comes up twice???
Im new to the BMWs having owned mostly Chevy Corvettes and Camaros dealing with the LSX motors but its never too late to learn something new.