Numbers changing on dashboard Engine section

Hello, today I noticed red numbers from 1 to 3 on my dashboard (Honda Jazz 2009), in the engine part. They appeared on the bottom in the middle of the window while I was driving. We stopped switched off for 5 minutes, back on, they were not there anymore.
Garages are closed now, tomorrow morning I have and important meeting to drive to, do I need to check it urgently? What can it be?