E39 lambda / oxygen sensors

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Originally Posted by doyleeoin

Have you noticed any difference? I've just bought two pre cat ones for my M3 as it's on 106k miles

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I haven't driven it much tbh. But the DTC is now staying gone. I'm going to change the pre cat ones in a week or so. Just to keep it tip top.
I'd be more interested in turning off the Auxiliary air pump than any of the lambda features tbh.

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Its the pre-cat ones I'd would have changed first TBH. They're not that expensive anyway I suppose.

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Originally Posted by Smokey Bear

Its the pre-cat ones I'd would have changed first TBH. They're not that expensive anyway I suppose.

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One of the post cats was faulty. Hence being changed first.
Pre cats will be changed purely as a preemptive measure.

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