Quote:
Originally Posted by Dragon_EX
Probably just better manufacturing really. There must be some tight tolerances that an aftermarket one can't get just right, but how a car can even pick up on that is beyond me.
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A check engine light from a loose or missing gas cap appears as an evap system leak. Fuel vapor from the tank is stored and sent through the intake to the engine, where it is burned. This system is in place purely for emissions so that fuel vapor isn’t free to evaporate into the atmosphere.