To replace it is very very hard due to its location. BUT... it is quite simple to take care of if you understand what a knock sensor is. It is just a sound detector. It listens to the engine and if it hears detonation, then it signals. So you need a sensor that works, but if it hears nothing who cares?
Thus, fixing the problem (you have a code) is easy. Buy a new knock sensor. Mount it to the body of the car anywhere that is grounded. Like the sheet metal above the engine manifold. Now reroute the wires that run to the old sensor to this new sensor. Leave the old sensor (now disconnected) where it is. You will need to get the manual (ebay) to locate the wires. Oh - the white wires turn yellow with time. That yellow wire is white.
The new sensor operates perfectly, but it never hears anything. Problem solved.
F&*K-off you guys at the DMV and the EPA!
The knock sensor on the engine is there to detect for an engine noise from pre ignition (pining) normally. This is so the computer can advance the ignition timing to the maximum it can without the engine pinging. This gives you the best engine power and fuel mileage. If the knock sensor is not working then the engine could start pinging without the computer being able to detect it. https://detectorly.com/beistle-55835-10-pack-star-cutouts-5-inch-review
Villagers **** to work on but only one bolt holds the knock sensor in place... look around lower intake manifold...
SOURCE: DIY replace knock sensor?
before you start taking stuff apart, make sure that the knock sensor is bad and not the wires. test for ground and continuity on the signal wire from the sensor connector to the pin on the pcm connector. google "testing knock sensor" for more info
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