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Hi guys I have a audi a1 1.4tfsi 2011 I’m losing boost and getting underboost codes as well as overboost codes I’ve changed my turbo solenoid valve map sensor the only thing left is my boost control valve and turbo activator a friend said when you start up the rod should move as it pull a vac but no luck I get boost sometimes and no boost! It’s mainly when I accelerate and change gears help !
 
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