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Hello and thank you for using Just answer! I'm Billy and i will assist you with this. Feel free to ask if you need any further info.
This can be serious....and can be simply nothing.....
As this is the warning light, telling you that a fault is detected in the engine management system.
(except if it is the defrost, demist light....which would have nothing to do with the engine)......
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If it is the engine, then, you can remove the battery negative cable for a minute, and then refit it.....the light should turn off......if it gets back on, then you need to scan the vehicle (using a scan tool), to retrieve the fault codes....the fault codes would identify the faulty component(s) or wiring (be it catalytic converter, or other component) to be further checked and replaced accordingly.