Audi A1 issue - Help pretty please

Davyy

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Hi all. My first post!

Recently purchased an Audi A1, 1.6turbo diesel, on 50k miles. 2012.

It has a running issue, very noisy, and feels underpowered SOMETIMES. I have to rev it high in first gear otherwise it lacks power in second gear. Other times I reverse out of my space, and it runs rough so I have to turn it on and off again and it works fine. I took it back to the garage I bought it from (7 months ago), and the plugged it on with the code PO299 - Charge pressure control and said it needed a new turbo.. as the part wasn't available on it's own, so it needs a whole new unit. The turbo is a Borgwarner 03L253056R, and they quoted £1400 part and labour.

I took it to a friends garage who plugged it in, and got the same code. They manually inspected the turbo and the turbo is free, and seems ok. He seems to think the issue is electrical.

Can anyone advise the next step?
 
More info.. engine code is CAYC - enquired regarding a new turbo (just incase) and cheapest I could find was £340, and send my old one in exchange.
 
Having looked around, seems the fault code is to do with anything boost leak related. Any advice on common places to look etc?