2021 force 400 atv with flashing injector light on dash. Will not start. But does spin over. Any ideas where to look? We have cleaned the ground cable and the positive cable. Was running and then shut off and the injector light started flashing. Fuel pump runs when key turned on.

Codes
P0031 /$11 HO2S heater control circuit low Bank 1 sensor 1
P0261 /$11 Cylinder 1 injector circuit low
P0458 /$11 Evaporative Emission system purge control valve circuit low

[2015 Z Force 800 53/Trail EPS]

Sense multiple systems show low voltage I would look for a connector with water or corrosion. I would start at the ECM.

I have been checking them; I am going to continue to look around. I also ordered all new relays.  I will update on what I can find if I find out whats wrong.