Some Model year 2010 cars suffered failed temperature sensors, mine being one of them: I got the "Engine System Service Required" message.
Your problem would seem to point to a DPF problem rather than a sensor problem. Did your dealer not do a fault code check when they did the regen?
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2018 V90CC D4, 2022 XC40
1940 Matchless G3, 1980 Moto Guzzi T3
Coming soon:- 1947Rover 14 P2
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