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Vectra C 2.0 dti 2004 - Turbo Over boost - tyreman

Had a problem at weekend when the car lost power while towing caravan.

AA diagnosed Mass Air Flow meter which has been changed and the fault code erased.

Now have new fault - TURBO OVER BOOST

Any help will be appreciated as I am supposed to be taking family away for annual hols at weekend and looking unlikely at the moment.

Cant afford dealers diagnosis as paid for holiday!!!

Vectra C 2.0 dti 2004 - Turbo Over boost - unthrottled

N75 (wastegate control) is not working correctly. There are loads of threads on how to sort this.