Just picked up on his thread and hopefully my experience may help.
My car had a similar problem with sudden loss of power when revving over 3k rpm, when accelerating heavily. It was intermittant at first and then got more frequent and it then started occasionally to lose power at higher constant speed (motorway conditions).
After two trips to dealer, a split fuel pipe was found, that was drawing air in and causing fuel starvation. No leak was evident where split was.
Re DPF discussion, I don't think problem would be there anyway. If DPF pressure differential sensor was at fault, car would probably not rev above 2800 rpm and this symptom wouldn't clear until engine is stopped and then restarted. No engine warning lights would show under this condition.
As has alraedy been said, if this sensor fails a fault code will be logged which will show up sensor straight away.
I hope this helps. Good luck.
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