The regeneration process requires the car to be travelling at a constant speed in the mid range and for the engine to have reached its standard operating temperature. If the DPF has filled with soot, the back pressure sensor will register and trigger the regeneration. High speed is not required and while the regeneration would function at high speed, it would be more difficult to maintain a constant high speed than a constant mid range speed.
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey
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