What is your question?
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What is your question?
I am getting conflicting information as to the location of the bank 1 sensor 1 oxygen sensor for my bmw 740i. I am told bank 1 is the side of the engine that cylinder #1 is located. I am also beeing told b1 s1 is located on the passenger side of the vehicle. and to top it off I am being told cyl #1 is on the drivers side. So what is the true story is the b1 s1 located on the passenger or drivers side? and is cyl #1 located on the passenger or drivers side? In other words which side of the engine front sensor should be replaced?
1 Reply
Bank 1 is where #1 cylinder is. The Bank 1 is the right / passenger side. The cylinders are (from the front to back) 1-2-3-4 The Bank 2 is the left / driver side with cylinders 5-6-7-8. The sensor 1 is located BEFORE the catalytic converter (between the engine and the cat. converter). At this age I suggest to replace all 4 O2 sensors, not only one - BMW recommends to change all @ 100K miles anyway. I also suggest to use OE parts, for the "universal" O2 sensor -without the connector- you will just waste your money. Zee