Check to make sure interior heating works, common for these to need the final stage replaced. If auto make sure auto box shifts as it should. 2.2 M54's can burn oil so check the oil level and then also check for excessive smoke in some cases a CCV replacement will sort this issue if the car has been looked after with regular servicing/oil changes.
Lift the oil cap and check for excessive carbon build up on the cap, will be a sign of not having regular oil changes throughout the course of its life. Outside of that your into the usual like checking for worn ball joints, bushes, vacuum pipes etc. Doing a cooling system overhaul if its a keeper is well worth considering.
I am sure there is more and possibly others who have/had these cars for daily's and spent more time around them will be able to add further insight as to what to look for.
Best of luck with it James.
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