Can you show you you need to replace your knock sensor where is is located on a 97 Nissan Maxima?

The knock sensor is located in the valley between the cylinder heads underneath the intake manifold. If you look in on the driver's side, it's the little black sensor with wires coming out. The connector for it is by the front cylinder head (follow the wires). They say you have to remove the whole $%^&ing intake manifold at a labor rate of 4 hours to get at it. I've found posts where people say they've gotten it out with extensions and u joints. Good luck, the dealer wants $900