I did a search for this thread but i want to be sure before buy a KS.
Well my car pulls the 0304 codes(knock sensor) like one time a week...sometimes one time in 2 weeks...i dont know if theres a problem with it or what. I noticed a poor gas per tank.

 

I used to get the code on a weekly basis as well and the first time I got the code I had put 87 octane gas in my car. It every once in awhile flipped on again until I changed it. Your best bet is to change it. You most likely need a new one, that will also keep you from second guessing.

 

i forgot to tell you guys, it always comes with 0302 codes too. Sometimes just 0302 egr insufficient or excessive low detected i dont know if this happen just cause my car has an intake(like frankencar)

 

Knock sensor will never trip the CEL .. it only pops up with another code.. the best thing to do is to fix the other issue and the knock sensor code will go away

 

sorry guys for my ignorance but what do you mean with CEL???

 

check engine light

 

I had the same issue sort of. 0304 was showing, corrected other error code and rechecked a short while later and no 0304.

 

which problem did you correct? dlicari?

 

probably front heated right/left oxygen sensor

 

If you are getting a code after resetting it multiple times, the sensor is probably bad. A KS code will often be accompanied by other codes. Get the other problems fixed first, then recheck for KS code. If KS code comes back, then replace the KS.

After replacing the knock sensor on my car, I noticed an immediate increase in power and mileage.

 

I had the same issue sort of. 0304 was showing, corrected other error code and rechecked a short while later and no 0304.

 

You should only change the knock sensor when 0304 code is by itself. As was said, it does not light up when only 0304 is present so you have to pull codes if you think your gas mileage and performance has suffered.