Andrew, wow, you're way beyond my comprehension. How do you reset fuel ?
You must have a computer software package. I do have the live data , just having trouble uploading the images, stay tuned. It maybe the MAF. This one is over 10 years old and at least 100K on it.
It's just about done, at 20 years n 260K miles I can't see spending more money on it. Oddly, it doesn't burn oil and the trans is fine. I do need a right front wheel bearing though. Maybe brakes soon. etc.

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X5 3.0 AUTO -2001 - 238,000 miles