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I've had that happen several times. Two years ago, I drove from Milwaukee, WI (an ethanol mandated area) to Seattle and back. About half a tank into non-ethanol gas, the CEL turned on and stayed on until about a tank and a half through the ethanol gas. Another trip to Northeast WI, I filled up on non-ethanol gas and the CEL came on half tank and stayed on until I drove on the ethanol crap for awhile again.
I am currently on a road trip through WV, VA, NC, TN and KY. Somewhere along the way I fueled up on non-ethanol gas, and the CEL came on at about the half tank level. Several days later, with multiple fills on the ethanol mix, it went off. It's been off for three tanks of fuel now.
I'm not sure why that happens, but it does. So I wouldn't freak out. Next service trip, have them check the OBD and make sure nothing's amiss, then fuhgettaboutit.
DBear
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