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BMW 540 Forum : “where is the bank 1, sensor 1 o2 sensor located on a 2003 bmw 540i?”

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hairbymary
09/16/2007, 5:37PM
About: 2003 BMW 540i
where is the bank 1, sensor 1 o2 sensor located on a 2003 bmw 540i?

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littlehorn
09/17/2007, 7:01PM

I believe this is the upstream 02 sensor, usually located in the exhaust system either right in front of (to the engine side of) the catalytic convertor, or in the exhaust manifold.  

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