how to replace a camshaft sensor on a 1999 nissan sentra

cam sensor is part of distributor. you replace complete distributor. where did you buy part?

Well I only have the cam sensor shaft only is that mean I have to replace the whole distributor which the sensor is built in distributor.

can you post pic of part you have? does this whining noise happen when car sits and motor is at idle?

The car does not turn over it just makes awhinibg noise it doesn't even turn over to start. It just does a whining noise when I try to turn on the car. There is picture of cam sensor I want to replace. My other question is if the starters is good and it is engaging could it also be the flywheel. The teeth on starter looked good so ??

you got a bad starter drive(1 way clutch) or your flywheel teeth are missing? not likely they are missing unless it was grinding alot when trying to start before.

who tested starter? it not only has to spin but also extend gear to engage flywheel. but if 1 way clutch is bad it will spinand make squeal/whine noise but not turn motor.

that part you pic looks like CRANK sensor. there is some confusion regarding this part from nissan.

Thanks for your help I'm going to take the starter off to double check that starter again Thanks again for you Help.