Yeah, knock sensor will not make it ping. What the knock sensor does is send a signal voltage to the ECM when the engine pings or knocks and the ECM, in turn, retards the ignition timing slightly to help minimize engine damage. Yes, it is a pain to get to as it is bolted to the top of the engine block; the intake manifold has to be removed to access it. Some people have purchased a new knock sensor and a subharness for a Maxima and relocated the knock sensor to the top of the intake manifold for better accessability and to avoid having to remove the intake manifold. I would think, though, that it probably gets a better reading from the top of the engine block. The Maxima subharness does have to be cut and soldered to the original knock sensor circuit to complete the bypass. Some reasons for "pinging" can include a lean mixture or carbon buildup on top of the pistons.
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