Join Date: Jun 2005
Location: San Diego, CA
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The knock sensor went out on my 97 GXE a month ago. I was getting the 0304 code on the ECU.
I went under the car to chack it out; the sensor tested infinite ohms (shorted), so I knew it was bad. As for replacing it though, one would have to be Plasticman to reach in there and get that sensor without AT LEAST removing the header/cat.
Also, I am too cheap to buy an (arguably) unnecessary part for darn near $100.
What I did was:
1) Disconnect the two-wire pigtail that leads to the KS from the harness; not right ON the sensor, but the connector maybe 4-6 inches away from it.
2) Jam a 470 k-ohm resistor into the harness socket, across the two leads.
3) Tape over the sensor and seal it real good with electrical tape.
Total cost: $0.99 at Radio Shack (already had the tape).
The knock sensor is supposed to test at a resistance around 500 k-ohms. This fix "tricks" the ECU into thinking that you have a functioning knock sensor that simply never sees any knocking. My 0304 code went away and has not reappeared for 4 weeks now.
If you do this, don't use crap gas or you might get some actual knocking...at the very least, this could be a temporary fix that will get you past the ECU emissions deal.