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I had it happen in mine too because of the gas cap. To reset the check engine light, as soon as you turn the key,pump the brakes hard 3 times. That fixed mine. Though it always reappears.
My car was sitting for awhile and when I went to switch into either 4H or 4L it would not engage at all. I checked the fuses and nothing to indicate a problem. I am getting power to the solenoid and switch. Can someone direct me to a schematic?