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Hi all Audi A6 2.0 TDi 2010 (60 plate) I had a service and timing belt done a few weeks back and since then the engine fan starts up immediately the engine starts and stays on until it's switched off. No over-run, that I've noticed. Audi told me that the DPF sensor had a fault and was causing the problem. Got the job done, collected the car and guess what - the fan is still on all the time. Sods must have known it wasn't fixed. I'll be taking it back, but in the meantime does anyone know if there is anything that could have been damaged during the timing belt work which could be the cause? Call me suspicious, but this problem only started immediately after the timing belt work was done.... I'm not a massively experienced car mechanic, most knowledge is to do with 2002 BMW 530i M Sport, but I am reasonably practical and if there are coolant temperature sensors (for example) which I can check then please can someone point me in the right direction or give me a link to previous threads if they deal with this issue? The coolant level seems too high in the reservoir, don't know if that can cause an issue? cheers Appoman