so this is not gonna be easy getting to. oh boyRear(towards the rear of the car) of the block, towards the top, just below the head gasket, the intake manifold covers it up. You can barely get to it from underneath, and the clip holding the connector on is a bugger.
Thanks guys !The knock Sensor location center of the block as close to the combustion chamber for the simple reason is it's living up frequency of the combustion. It's a engine safety device