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Hi guys . I have a 2007 crd 4x4 6sp manual . When it is cold it does not boost at all and when it warms up it has very little boost . I used to be able to hear the waste gate release on gear changes and it boosted well but has now lost all boost when cold and only very poorly boosts when warm . Open to your thoughts .
Edit . It is on 106 k miles and was running sweet and I have not been messing , honest
 

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What codes are you getting as this will indicate what the issue is. Check all hoses for leaks, make sure vacuum pump on right hand side of battery tray is pressurising the vacuum system when key is turned to position two and consider changing the MAP sensor for a genuine VAG one. I just fixed mine this way, but note - need to know what the codes are for a better diagnosis.
 
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