Honda Pioneer 1000 2017 Owner's Manual page 267

If your Honda SXS becomes immersed in water (water level is above
the floorboard), inspect the vehicle to avoid severe engine damage
by following these steps:
1. Move your Honda SXS to dry land or at the very least, to a water
level below 10 inches (25 cm).
2. Check the sub air cleaner condition.
UNDER FRONT HOOD
sub air cleaner housing cover
– If the sub air cleaner is wet, water may have entered the air
intake system. Do not start engine.
– If the sub air cleaner is dry, the engine can be restarted.
3. Take your Honda SXS to your dealer for service as soon as
possible, even if you succeeded in starting the engine.
sub air cleaner