If your EM (Engine Management) light is on, I would get it to a Ford main dealer or loacal reputable garage ASAP for a diagnostic test

An engine sensor has clearly picked up a problem that requires attention ASAP.
You shouldn't continue to drive it as normal. if you do, you might make the problem/damage worse

What could be wrong?

This could be something relatively easy/inexpensive to sort, such as a failed coil pack, at worse/most expensive, a failed catalytic converter.

or anything in between, the above is just to make you aware of the vast array of issues that make the EM light come on.

Hope this helps

Andy