Thanks for the reply guys. I ended up taking the air filter cover off and the MAF which was quite easy with clips which I have done before. I did go to a local auto shop but nothing there to suit. Mine is on a Bosch MAF and I see there is actually a special tool available for the Bosch MAF sensor screws.

This is all because my X5 has developed an engine warning light and thought it could be that. I did disconnect it with no change but ended up cleaning it anyway.

I think i may have a no 7 cylinder issue (oil, plug, coil or anything else) from diagnostic tool.

Off to my mechanic next week for this one.

Cheers

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2005 X5 4.4i M Sport
2003 X5 4.4i