Where is it on an 02 SC model this thing wont pass state insp and engine light on. I know the intake has to move I just want to remove as little as possible. Saw the post about ziping it to a line and improving gas mileage. Is this possible just by moving the sensor?

There is a resistor modification that you can perform to bypass the knock sensor, but it should be used for diagnosis, not a permanent fix.

But you have other issues, because the knock sensor code won't turn on the light. So you need to figure out why the light is actually on. Then go from there.

im just tryin to get the light off and pass emissions for inspection.Not even sure where it is. All I know is its on the block under the intake somewhere. Its on the passenger side right?

It is located to the rear, under the intake, just a bit off center of the block. you cannot reach it without removing the intake and everything above it. but as it was mentioned before, the KS will not cause your "engine light" to come on. which if your SERVICE ENGINE SOON light is on, then there should be a code to let you know why its on.

Thats the code it was giving. o2 densor and knock sensor. I replaced the o2. Light went off. Drove for 20 min. Once the onboard computer reset it came back on.

If the light came back on, then there's another code.

You need to find the new code. THE KNOCK SENSOR WON'T TURN THE LIGHT ON!

There's another code, period. You might have replaced the O2 sensor, but a code doesn't mean "replace this part", it means "diagnose this problem". You probably need an aux ground installed, not a new O2 sensor.

Pull the new code, search for the resistor mod and fix the light, not throw parts at it.

will the knock sensor retard the timing to the point of loss of performance and gas mileage?

Only on a SuperCharged engine. Yes, it will.

my Xterra is throwing the codes at me for a knock sensor circuit malfunction bank 1 or 1 sensor, and a evap emission control system pres fault...what could all of this mean?

According to the shop, that I heard back from today, I think I have the same two codes you have. They recommended replacing the knock sensor and the charcoal canister. Replacing the charcoal canister I think will clear the evap emission code your getting if I understood what the guys at the shop told me (feel free to jump in anyone if I'm getting this wrong).

To fix both codes, they quoted 1200, but I'm going to try to replace the charcoal canister myself. Haven't found any info on how to do it, but I'm going to post here to see if anyone has anyone done it before.

i'm goin through pretty much the same thing. i have an '03 frontier. my check engine light has been on all summer. the first shop that hooked it up for me told me it was the evap solenoid, and prob the gas cap. i replaced them both yesterday (i don't think u have to replace the whole charcoal canister, prob just the solenoid / valve, which was relatively easy on my frontier. i dropped the spare, so i was looking at the canister. i removed it, put it in a vice, and 2 rusted bolts later the valve was replaced and it was ready to go back in.) then, my buddy hooked up his computer to clear my code(s), when we discovered more. i have a code 420 (hehe) which is inefficent cat and a code 328, which is a bad knock sensor-bank 1. now, i hope the knock relocation procedure discussed here will work for me. does anyone know? the evap valve was $75 dollars at napa, and i gas cap was $30 at a dealer. i was told by a few mechanics that a bad gas cap can throw an evap code, and to only replace it with a factory cap. aftermarket ones can throw the same code out of the box. hope this helps.