Which sensor do I change when i get this code in my 2008 bmw 535i?

Question

I would likw to know what 02 sensor i should change to have the check engine light cleared or.how do i test which sensor is faulty?

Answer 1

HI there

This code could be either the upstream or downstream O2 sensor. The way to determine is to use a scan tool that can see what's going on with both sensors. You need to evaluate the data from each sensor to determine the cause of the code. most of the time it's the rear sensor after the converter on bank 1.

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