My 2002 Gems Plus8 had the light come on occasionally. My Autel Maxiscan OBD tester showed a " random intermittent misfire" fault. Engine ran well. I used it to clear the fault code/light but it occasionally came back. The Gems system has a stats type package that monitors these types of faults and when the data hits a trigger point it lights the MIL. Random electrical...GRRRR. Lots of checks done including the live running option but everything appeared ok. In the end I stuck to V-Power 97 octane and the light stopped coming on. I noticed it triggering a couple of times after filling with 95 octane so as other checks didn't show a reason I thought I'd try the petrol change. Out on a run I accelerated out of a petrol station after a fill with 95 octane and the light came on. This got me thinking of switching to 97 octane as a test. It worked. I also got a small mpg increase.
Definitely look at gomog. The Plus8 specific section has a lot of helpful info. You can get OBD Apps for your smartphone that work well. Not expensive and a big aid for fault finding.

Plus Four MY23 Furka Rouge