in my case there was no fault or code. the "check engine light" you see is the exact same as when you put the key fob in but haven't yet pushed the start button. the purpose of turning it on (and other indicators) is to let you know the bulb behind those indicators are still burning.
it is not the same as the indicator being "on" if you know what i mean. if your case is the same as mine, your "check engine light" has never come on because of a fault.
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