The light will disappear after three "cycles" (i.e. three instances of starting the car, driving and then leaving it for a period).
Intermittent faults can come and go all the time, for a variety of reasons (bad fuel, even sensors being misread when battery demand on starting is higher).
If it were me I'd be curious as to why is saying "I'm poorly" and would want to know just for peace of mind. It could be something that could save you money on repairs if yiou catch it early.
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