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Given your error testing has proven OK so far I’d focus on the EGR, turbo, and swirl flaps.
The actuation of any of these could have an effect on engine performance.
I’d also run a tank of fuel with a decent full system cleaning agent, i.e. one that will clean the fuel system, injectors, turbo, DPF, etc.
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Current : F31 330sD, remapped, Ohlins Road & Track, Millway camber plates, Quaife LSD, Stoptech brakes + Pagid RSL1 pads all round, Weichers front strut brace, Eibach front & rear anti-roll bars, Michelin MP4S.
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