Check Engine Warning in a 01 X-30

Yesterday the red "check engine" light in my X-30 turned on while driving at 23 m.p.h. It didn't buzz but also didn't turn off.
The temperature remained at 160 and oil pressure above 40, as always.... Voltmeter was fine too...
Any ideas on what shall I do?
And what is most important, can I keep using the boat (at least for a few days) if I keep an eye on temperature and oil pressure to avoid big damage?

Thanks!