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help! 02 x5 o2 sensor

1K views 1 reply 2 participants last post by  Scott ZHP 
#1 ·
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
 
#2 ·
Bank 1 = cyls 1,2,3 (the forward most sensor)
Bank 2 = cyls 4,5,6 (the rearward sensor)

Precat are in the manifold, closest to the head, easy to reach.
Postcat are, well, post catalytic converter.
 
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