I pulled up my previous downloaded data from my engine. I have a level 3 dongle. Even though I have not had a lane warning light (since I zip tied the connectors), I have numerous fault codes in the records. The same as Paul discovered when looking at the fault codes from a different 912iS engine with no issues. Again, I think most of those are generated during start up and shut down (or lane tests during run up). In any case, I would be chasing non existent issues if I pursued them.
Instead of using the fault code page (unless the fault codes are time stamped) I suggest using the "Data" page and trying to connect a specific out of range engine function with the time period coincidental with the illumination of the lane warning light. On my computer those out of range functions are color coded.
If possible fly the airplane and use the dongle real time to see what is out of range when the lane light illuminates.
I certainly agree with Paul's concern about the lack of diagnostic information. There may be some Rotax document detailing the specifics of the engine computer but I am not aware of a list of possible failures that can trigger a solid or blinking warning light. That would at least narrow down the items to consider.
