Passat B5 Diesel....No Boost....HELP!!!

[Lordbenny]

I have a 51 plate B5 Diesel Estate that has lost its turbo boost.

I have tried the following:

Fuel Filter change (At first I thought it might be a fuel problem but No)

I've checked all the pipes for leaks

Disconnected the MAF sensor....No change

Felt the turbo impeller (Not siezed), turbo looks and feels ok.

I had a mate hook up a diagnostic reader and I got the following code: P1557 - Charge Pressure Control positive deviation.

Can anyone please help as I'm out of ideas?

[Lordbenny]

Thanks for your help

Fixed it, it was the MAP sensor!