2.3? So its a T5?

If auto, check it changes gear without slipping, check for any strange and
random messages on the dash, check the Service history is bang on, the front
tyres for uneven or excess wear (and get friendly with your tyre dealer!) If
wear is uneven this can mean big /alignment suspension problems.

Check the climate responds properly to the controls, some have a mind of
their own, and that the rear suspension isnt tired from excessive towing (if
there is a hitch) or from constant heavy loads.

Which model is this T5? Spec is important when it comes to selling on..

Tim..