I'm having a problem w/ my knock sensor. I ran the code and it gave me 23 so I looked and the knock sensor wasn't even wired up. So did some research and wired it up and the check engine comes on. Same code so i'm assuming that the knock sensor is bad. But, a buddy of mine said that I should have hooked it up to a computer and had the ecu reset? I'm not sure what to do...Go and buy a Knock sensor or take it to a dealer and have then reset the ecu. P30 by the way sorry to leave ya'll hangin.