VAG COM Diagnosis Required in Reading Berkshire

[sharan1.9]

Hello all i have a 2006 vw Sharan 1.9 TDI and when the cars is run on the motorway and the Engine Temp Rises
the Sharan goes into Limp Mode and the car wont go over 70

after restarting the car it drivers as normal untill boost presure rises

i checked the MAF and its not that or the Boost Pipes

im guessing its the N75 valve

i am prepared to drive to anyone in Berkshire to get my car checked on Vagcom and i will pay 5 pounds for your trouble

please PM me if you can help


thanks