You need a code reader that plugs into car's diagnostic port.
What engine light. If you are referring to the Check Engine light then reset it with an OBD2 scan tool after the problem is repaired.
The check engine light on a 2002 Ford Focus can be reset by disconnecting the battery for 1 to 2 minutes. This resets the vehicle's computer and clears the light.
After the Explorer is scanned for trouble codes to diagnose and then repair the malfunction , then the check engine light can be reset
to reset "check engine light"- (on '05 freestyle) remove the negative cable from the battery for at least 20 min. It worked for me
The check engine light can be reset two ways. 1) If the problem resolves itself, the check engine light will reset itself after a certain amount of cold starts of the car on the on board computer system. 2) You need an OBD reader that has the reset check engine light capability.
Have vehicle scanned
Disconnect the battery for 15imutes
For the 1994, you have to remove the negative battery cable, then depress the brake and hold it in for 5 seconds to reset the check engine light.
you might have to take to the ford dealer or READ THE Manual
Unhook the battery for about 2 minutes and that will reset the computer.
With an OBD2 scan tool.
how do I reset my service engine light on my 1999 ford f150