I've notticed that my check engine light only comes on when my fan turns on. I believe it is the fan on the passenger side under the hood. To the best of my knowledge from reading on the forum I believe this fan should only cut on when the engine reaches a certain temperature (correct me if wrong). Well problem with that is that it cuts on almost immediately after I start the car, then it rarely ever cuts off. The brief moments when it does, cel goes off, then not long after like less than aminute it cuts on and so does the cel. It sounds like a freaking helicopter is under my hood! How the helll do I cut that thing off or make it run the way it supposed to please? Being that if that fan was off my cel would be off too I should be happy id have no cel warning for anything else right? Means aside from that the cars running good?