Does anyone know how to electrically check a knock sensor? I am getting a knock at moderate acceleration through the 1500-2000rpm area, which seems to be all the time in my 97 C36. There is, I believe, only a single sensor on this engine, but connecting a timing light and whacking the block with a hammer is not really an option, as I do not have access to the high tension wiring while the engine is running.

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'96 C280 (gone)
'97 C36
'05 C230k