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Q: Turbo Over-boost fault. New turbo and filter replaced on 2004 BMW X3

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My x3 had a new turbo as it was loosing power on hills and even on motor at around 70mph. New turbo was from a good quality re-manufacturer and fully test all of their units. I told the mechanic it was still loosing power straight away and they tested it and said the fault code was 'over-boost' and they said it was definitely the new turbo - however my concern is that the fault i experience when driving is exactly the same as before the new turbo. I have booked the car in with a different mechanic and am asking him to check vacuum hoses, turbo sensor and turbo actuator arm? Can anyone help with what else i should get him to check, or i can even check myself????

Thank you for your time
Alex
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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