code 21, knock sensor failure?? why?

[ProCat]

Anyone have any feedback to a code 21 on an 09 Crossfire 800? ECU says knock sensor failure, sled went into limp/rich mode. Also flashed an 02 code as well, open circuit, barametric pressure error or something like that?
Anyway to test a knock sensor or fool the ECU to confirm it is damaged?

 

[deviant]

I think Code 21 means your Knock sensor sensed a bad knock. Usually caused by old or bad fuel. Try running New 91 octane in it.
Code 23 means the ecu did something about the knock and enriched the fuel and changed timing to keep from hurting your engine.
Also check for loose stuff including heat shield on the pipe that might cause a vibration that the knock sensor is picking up.

 

[hatchers]

I think Code 21 means your Knock sensor sensed a bad knock. Usually caused by old or bad fuel. Try running New 91 octane in it.
Code 23 means the ecu did something about the knock and enriched the fuel and changed timing to keep from hurting your engine.
Also check for loose stuff including heat shield on the pipe that might cause a vibration that the knock sensor is picking up.

that is correct

i cant get mine to go away above 14lbs of boost, so i moved it, a/f is reading fine and i burn straight sunoco 112......no worries