How does the Check Engine light work on a Ford?
How does the Check Engine light work on a Ford? On a Ford the check engine light operates a little different from other vehicles in that it goes off after cranking while on others it goes off after the ignition is on for a second or two. Frankiedon Was this answer helpful? Was this answer helpful? What to do if your check engine light won't turn on? They might also tell you its an o2 sensor, ask them to show you on the car where it is. then buy a 02 sensor and replace it your self. saving you about...