CEL-no symptoms?

[shadrach74]

Originally Posted by particlewave

I think it may have been a fuel issue? I was in KC a couple weeks ago, and had to stop for fuel. All that I could find was 91 octane.

I ran the tank almost empty, and refilled with 93 octane. After driving for about 10 miles, the check engine light shut itself off.

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...