I have 3 Ford vehicles: a 2001 Taurus, a 2006 Taurus, and a 2008 Explorer. All of them have V6 engines. The check engine light for all 3 comes on at times.
If I use gasoline without ethanol, the CEL usually turns off within the first tank. But, when I switch back to gasoline with 10% ethanol, the CEL eventually comes back on.
Anyone have any ideas or suggestions?