i have a 02 x5 and im running a check engine light which happen to be my o2 sensor. got it diagnost and it read bank 1 sensor 1 pre cat. my question is theres 2 pre cat. which one is bank 1 sensor 1? help please.....
and also, are they both the same sensor because its two different part number
and also, are they both the same sensor because its two different part number