P700 2018 check engine light

[CTA12345]

2018 Honda pioneer 700 check engine light comes on at idle 2 long lights one short then when on the gas light stays on solid any ideas

 

[Remington]

Welcome from Michigan!
not sure about the P7’s engine light codes. Maybe one of the P7 guys can chime in.
Oh BTW....
Pics or it Didnt Happen!

 

[DG Rider]

Code 21 is O2 sensor malfunction.

 

[CTA12345]

Code 21 is O2 sensor malfunction.

Thank you I will check that out