HI there,

Need a bit of help if possible please. When driving my 04 Vectra 2.0 and hard accelerating around 3k revs, the spanner light comes on. I connected my Op-com and it came up with fault code P0234 - Over boost. After looking on various websites. Today i checked the wastegate on the turbo this moves freely, Removed the intake manifold and de-clogged it and the same with the EGR valve. Cleaned the boost pressure sensor, Checked all intake hoses and vacuum pipes they seem ok.

I've seen on one forum that extending the wastegate rod can cure the fault, but is this not just masking over a underlying fault or should i try this as the next step. Any help would be very appreciated.

Regards Harrison