mmm...

135bhp Transit.

They used to have issues with rear door central locking looms wearing away on the indide of the door and the plugs corroding behind the light cluster. The FWD ones suffer from starters, water pumps (spines) and PAS pumps(splines). RWD ones have a vac valve for the EGR on the rad fan cowling which fill up with water and drop it into limp home (quick and easy to fix). On early ones the dual mass flywheel used to have to be changed on the first clutch change, assuming with an uprated version. This may have changed on the new ones. Occasional injector pump failure on some random vans (doesn't seem to be a trend but there are a few failing).

As for the Sprinter...

Tinny front doors that are not well made at all. The doors refuse to shut after a few miles have been put on the clock and seem to like to bounce open unless you slam the door like an animal. As the doors are so light, the hinges are tiny and so are the check straps. If the wind catches them, you end up with "fat bird access doors" opening to 125 degrees with strained hinges. Rear lamp clusters corrode and you end up with rear lamps not working. ECU failures are occasional causing the vehicle not to start. Plus if you run it out of fuel they are a cnut to bleed. If you crank it over for longer than 60 seconds after running it out of fuel you run risk of serious damage to the high pressure fuel pump which do fail. Fuse boxes have become a little bit common as well rendering wipers or indicators inop...

That is all I can think of at the moment....