UK Car Repair Questions? Ask a Mechanic for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
The engine computer/ecu can be a common component to fail and cause issues like this here.It is also known to turn on the engine fan when it has an internal electrical fault in some cases.All other components may work in the vehicle when this fails as allot of the other electronics are controlled by other ecu's in the vehicle.I suspect the dealer is correct here if they have tested this correctly with the ECU itself needing replaced.
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If the ecu needs replaced it will need setup and programmed by either a dealer or authorized repair center with their computer.If being reset this needs done with the same either a dealers computer or authorized service centers computer as these are the only ways to do this.