Does anyone have a problem with their knock sensor? My X is running terrible and the diag.reads knock sensor malfuntion. Could anything else but a defective KS cause the code to come up. I thought that if there was water in the gas causing it to run rough that maybe this could cause the code to come up. If I do have to replace it is it a difficult job? I've also heard of bypassing it with resisters. Is this common practice?
Standing by waiting to see if I have to replace it. Can't drive it like this.

First: http://www.automotiveforums.com/vbulletin/showthread.php?t=157161

If you're supercharged, your sensor is critical. If not, it's not. Yes, it's a royal bitch to replace.

Does anyone have a problem with their knock sensor? My X is running terrible and the diag.reads knock sensor malfuntion. Could anything else but a defective KS cause the code to come up. I thought that if there was water in the gas causing it to run rough that maybe this could cause the code to come up. If I do have to replace it is it a difficult job? I've also heard of bypassing it with resisters. Is this common practice?
Standing by waiting to see if I have to replace it. Can't drive it like this.I had the same problem on my 2002 xterra non super charged. My light came on for the knock sensor. Only thing I did was to tighten my gas cap down, and the light turned off after 3 driving cycles. I hope this helps you. Also try some shell midrange gas, my light never came back on and I'm back on reg shell.

The knock sensor alone WILL NOT TRIP THE "SERVICE ENGINE SOON" LIGHT. If you leave the gas cap loose, you'll get an EVAP code of some sort.

Offroad X is right . I just had that happen to me yesterday . One thing though . If you have a stereo system with a capacitor , you have to dissconnected that too or the main power wire will act as a battery from the cap. This will have enough power to run the Xterra's computer for a few days. Dissconnecting the battery works great just make sure the computer was unpowered. Check your short trip odometer to make sure it reset itself. I also had the faults read at Auto zone and the knock sensor went away and the check engine soon light is out too .