Forgive my ignorance but does this engine have a coolant temperature sensor providing the ECU with data used to adjust fuel injection? If so might it be failing and convincing the ECU that the engine is hotter than it actually is. I know this can be a problem with petrol engine cars but my experience with diesels is not extensive, even though I now own one!
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2012 XC70 SE Lux Polestar 230 bhp D5 Auto Oyster Grey
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