can the knock sensor be tested?

supercharged

Registered User
during self test.
computer shows code 225 and one time i got a 25
both relate to the knock sensor, (yes motor mounts are new)
could the knock sensor be flaking out sending voltage to the computer causing shiity idle.
cause my car runs SOLID. just when it's in gear at a stop light the idle suddenly drops like a rock (like it was told to by some mysterious force) to 500
But in park or nuetral idles fine. what should the idle be while under a load like at a stop light (automatic trannsmission)?
i'm changing knock sensor next week 25 bucks is pretty cheap.
any thoughts?
 
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