Dodge Caliber turbo faults

[marcus1875]

Hi guys
My dads 2006 dodge caliber turbo (diesel) (vw engine), is playing up. Fine when cold and tootling around town. However as soon as you need some power, nothing. It slowly builds up speed, but nothing on an uphill gradient, in fact it looses speed no matter how firmly the right foot is planted.
The pipes are sound, no leaks and fitted fine. No warning lights and fault codes.
He's had it into his local garage and they cant find a fault either.
Any ideas guys?
Cheers
marcus

[marcus1875]

Cheers Smithy.
My old man told me last week, but its been like thus at least a year he says.
Still drives. No smoke. No codes.
flummaxed

[marcus1875]

SmithyAG said:

Is servicing up to date including the fuel/air filters?

Probably not. He doesnt look after his cars very well. If it starts and goes then all is well he thinks.
I'll replace all today and service it, double check the OBD and pipe work. Hopefully something will bevome apparent.
cheers
marcus