Ford Focus 2007. Check engine light flashed for about 15-20 seconds on fwy. Suspect engine misfire. No more CEL flashing. Why did it stop?

Ford Focus 2007. Check engine light flashed for about 15-20 seconds on fwy. Suspect engine misfire. No more CEL flashing. Why did it stop?

A brief warning that resets itself could be something like a sticky, coked up EGR valve.

If you connect an OBDII reader the last fault should be stored and you should still be able to read the code, giving the exact cause.

I's always put new OEM spark plugs in a motor if the CEL was flashing!