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I wish I could give a "concrete" direction for you. When I was reading your post, my first reaction was the same as the your mechanics. Cam sensor shorted, must be the issue and it's causing the boost codes.
So what driving condition is causing the DTM? Are you just cruising along? Is it when you "tip in" to the throttle that it sets off the DTM eventually?
Also, since the cam sensor was replaced, does that code return still?
When was the last time the car was serviced, specifically topside of engine such as spark plugs, coils, injectors, etc. The direction I'm taking this line of questioning is to see if maybe a DME connector wasn't quite seated correctly. Typically when that happens you will get a lot more faults, but anything's possible.
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