2006 Mondeo Diesel in Limp Mode!

[Fury RS]

Hi, my best mate has owned a 1 owner 70,000 mls 2006 56 plate 2 litre diesel Mondeo Ghia for the past 6 months without a problem until the last 2 weeks. The car is fine for a while then loses most of it's power and goes into limp mode. The car has been at two different garages so far who thought they could sort the problem out but still to no avail and the cost is getting a bit silly now. So far; brand new injectors, fuel tank emptied and cleaned, fuel pump checked (ok) and new valve fitted to that and new fuel filters, new glow plugs and a second hand low mileage ECU (tested).
Turbo actuator maybe?
Any suggestions would be most welcome thanks...

[Fury RS]

Supposedly cleared the original fault codes before the new ECU was fitted and yes the car was sent to Ford for the replacement ECU to be coded to the car but still going into Limp mode?
Thank you for your time to reply, I will present him with what you have said so he can give it to this so called Indy specialist.

[Fury RS]

Thanks for the replies, will print these off and show them to the Tech at the garage this friday.

[Fury RS]

Update on my mates Mondeo; Sorted at last, a vacuum test was done on the fuel tank, found a plastic quality control tag had come off the fuel float and was getting sucked up whilst accelerating and was causing a blockage at the tank outlet! Surprised me abit when he said they had supposed to have emptied and cleaned the tank prior. Is this normal practice to have a tag on a part in a fuelling area???