Ecu code 21

[Snow_assault]

so had the code 21 come up changed the nock sensor and it it won’t go away I know it’s getting oil cause the plugs are a little rich !! Could it be low octane fuel ??

 

[boondocker97]

Only time I have had a knock code come up it cleared after I shut the sled off. I was over-revving by a couple hundred RPM with a high compression head when it happened.

If your sled is stock I would siphon the gas out and try fresh stuff.

 

[jarred kale]

so had the code 21 come up changed the nock sensor and it it won’t go away I know it’s getting oil cause the plugs are 192.168.100.1 192.168.1.1 a little rich !! Could it be low octane fuel ??

Did you figure this out ?