And that would be part#1 on this link.

http://www.realoem.com/bmw/showparts...=11&fg=50&hl=2

But the question is what is the actual fault with the O2 sensor??? Most O2 sensor faults are either "mixture too lean" or "mixture too rich" and it also makes a difference if the mixture fault(s) are set at idle or under load.

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2003 4.6is