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Well that didn't very last long! Noticed mpg had dropped again, checked faults which showed 30D6 - Nox sensor plausibility. I had reset adaptations and carried out a cat replacement procedure. Going to email bimmerprofs to see what the issue could be, at a guess going by "plausibility", maybe the reading under certain condition is questionable? I cleared the code and it hasn't come back yet although only had 1 driving session. Will report back when I have a response.
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