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While traveling out west last summer I overheated - badly. Afterwards I got the dreaded code 52 (knock Sensor) When the ECU does not "see" a KS, it puts the vehicle into limp mode. Usually the code 52 is related to the knock sensor wire harness. To change either requires removing the intake manifold which means taking off the top of the engine. Since I was on the road I did not want to get into such a massive job if I could avoid it. After some internet googling I made a KS which I bolted to the rear engine hook (for removing engine). I had several iterations - first gluing to the hook one piezo, then 2 . The lower one would melt (too close to exhaust manifold). Eventually I took 3 (in series) and glued them to a small piece of metal & bolted onto hook. (JB weld=glue) These piezo transducers (AKA "buzzers") generate a small amount of electricity when vibrated. A KS is a piezo transducer. The ECU advances the timing until the KS starts reporting too much vibration (knocking) and then the ECU backs off a little. The KS harness connects to the harness on the drivers side rocker arm cover (fuel injectors). I was able to move the throttle body and get to connector underneath. I got the piezo transducers at radio shacks. I went thru 5 of them before I got something what worked fairly well - $1.99 at Radio Shacks and got one off ebay $4 or $5. I did get a code a few times on the way home. I would pull the negative terminal off the battery and clear the code.