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Hi all I've googled this fault code and there seems to be loads having the same problem ,,,my misses has got a 2005 Astra 1.7 Sri and keeps getting fault code p0234 over boost deviation and goes into limp mode ,, I've checked the vac hoses and no leake ,took the turbo of and cleaned the veins ,replaced the vacuum solinoid ,air mass,map sensor ,cleaned the egr valve and inlet manifold but still no joy
 

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Assuming you have checked the operation of the waste-gate and actuator manually? There could be an issue with the wiring that feeds the BCS, worth checking if its getting a feed so it can operate.
 
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