I don't know much about the diesels but the fan connector, AUC sensor are in same area as right front headlight, was the car in accident? The headlight adjuster might be stripped and/or bracket broken. There is only one headlight level sensor so that's right.
You had to pay to get on here??

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)