Quote:
Originally Posted by mister_jp
I was thinking that there is only one o2 sensor by down pipe but there is 2 by dp !
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There's actually 4 o2 sensors in the N54. 2 pre cat (1 for each bank of 3 cylinders) then 2 post cat (again, 1 for each bank)
You will want to replace both of the pre cat sensors if thats what the issue is.