If the sensors are just covered with something, the system doesn't show any warnings. It just switches off. With an orange "i" on the display and a blinking green light on the switch it seems obvious, that there is something deeper.
I agree that an auto electrician with a suitable diagnostics tool is the quickiest, cheapest and best solution. But if that is not possible, then I would start by checking all sensor wiring connectors as well as the switch connector.
I doubt that any generic diagnostic tool is able to reveal anything about these sensors. You need Honda specific one, which are priced for professionals.