I think the 140 engines are great. Nice amount of power and tiurque when you need it.

Things that typically cause teouble are dual mass flywheel and sticky turbo.

If buying one try a hard accelerate on an uphill incline like a motorway on ramp or length of A road. If power drops off and car struggles to climb hill or accelerate turbo has triggered limp mode. Make sure you have a safe place ahead to turn engine off and on to reset it. Car will get you there on flat. Harder if still on incline.