G'day Billy boy,
hate to be a glass half full type (actually I firmly believe that if there's a space at the top, don't fritz around with kweschuns, just fill the bloody thing and keep going), but had an engine warning myself recently and in the long run, if you don't have the gear to read the error, the only safe, practical way out is bleed through the eyes at the shop where they can tell you what's needed.
I reckon I don't have the gonads to go bush up some remote creek bed and hope that the cheap, maybe fix is all that was required.
Total bummer I know but that's the way I went. Good part is I'm confident that all is fully reliable again.
Regards
Col