Thanks for replies and PM's. Have now heard back from RIBS marine.
Apparently, my engine, the 115 Opti does not have this sensor, so the fault warning has probably always been there, just not noticed it before (i was ambling up the river and looking through all the pages of the smartcraft options when I found the warning). When in for the next service, they will reset the software to get rid of warning.
Thanks again
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