Oxygen sensor ID question

[CraigW5150]

I have a 1996 328is and after getting the dreaded check engine light. I plugged in my peake diagnostic tool and it tells me that the bank one cyl 1-3 after-cat oxygen sensor is bad. I have two sensors after the cat conv. which of the two are bank one cyl 1-3 ????

Thanks !!!

 

[manuel]

follow the exhaust manifold(cyl. 1-3) until you get past the cat. theres one O2 on each exhaust pipe(i think).

 

[wood_e]

I say if ones bad the other is not far behind... repalce them both...

 

[chief]

Replaced all 4 of my O2 sensors. The price of them varied with the dealership. Then upon reaching Texas i got the dredded light again. Turned out that the 36 pound fuel injectors were fouling the O2 sensors. Went to BavAuto.com and obtained replacement O2 injectors for $25-$50 less than the dealerships.