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The other thing I was thinking of doing in line with the idea that the NOX sensor might be fuel contaminated was to clear the adaptations to allow it to relearn the 'fixed HPFP' change. Maybe I should have done it straight away although I don't think a replacement HPFP is in ISTA's list of 'reasons for resetting adaptations'. Can it do any harm?
As an adjuct to my NOX/NOXEM/don't trade-off thoughts in my main post, present fuel consumption is about 420 - 440 to a tank. E61 N53 530i, 2 -3 60mile fast dual carriageway runs per tank mixed with supermarket runs, big boot test runs and slower 5 - 10 mile A/B road runs..
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