The first method you should try if you're trying to get the engine management light off on your Ford Focus is to turn the vehicle off and on a few times. First put the key in the ignition and then move it from off in to the run position and then wait 1 to 2 seconds. Repeat this three times in a row. If the last method did not clear the light for you then what you can do is give your vehicle a factory reset by disconnecting the battery. Leave it disconnected for about 20 minutes and when you reconnect it to your vehicle your light will for sure be gone.
To reset the engine management light, try unplugging the battery and letting it drain. You can also scan the engine to diagnose it.
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