CEL-no symptoms?

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Originally Posted by shadrach74

There is absolutely no reason that 91 octane would cause a a CEL. What is more likely is that the gas cap vent was frozen at some point and the pressure in the tank would not equalize with ambient. When you removed the cap for fill up, that issue went away. For how log is anyone's guess. Read the code and you'll know where to start...

Thanks for the tip!

I'll have the codes read as soon as this snow is off the ground.