2000 nissan frontier 6cyl 3.3l will not start. pretty sure it is either the crankshaft position sensor or camshaft position sensor. since the truck wont start and I dont have an obd scanner I can't narrow it down between those two parts. I bought a CKPS since it was only 20$ but I can not locate where the sensor is.... does anyone know where it is? Also, is it true if its the CMPS, i would need to replace the whole distributor? Which sensor is more likely to fail and cause it not to start?

Please understand the fault code you have, it doesn't mean the sensor is defective, many other factors cause this code. Go to the link please. P0340 Nissan Camshaft Position Sensor Circuit Bank 1

see if this helps!
https://www.youtube.com/watch?v=A_XJgtfLauo

P0325 Knock Sensor 1 Circuit (Bank 1 or Single Sensor) -Circuit Malfunction
P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)
P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)
P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)
P0329 Knock Sensor 1 Circuit Input Intermittent (Bank 1 or Single Sensor)
P0330 Knock Sensor 2 Circuit (Bank 2) -Circuit Malfunction
P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)
P0332 Knock Sensor 2 Circuit Low Input (Bank 2)
P0333 Knock Sensor 2 Circuit High Input (Bank 2)
P0334 Knock Sensor 2 Circuit Input Intermittent (Bank 2)
P0335 Crankshaft Position Sensor -Circuit Malfunction
P0336 Crankshaft Position Sensor -Range/Performance
P0337 Crankshaft Position Sensor -Low Input
P0338 Crankshaft Position Sensor -High Input
P0339 Crankshaft Position Sensor -Intermittent
P0340 Camshaft Position Sensor A Circuit (Bank 1 or Single Sensor) -Circuit Malfunction
sorry would a play with this to know for sure ,check the wiring plugs onto the sensors to make sure their not full of oil or corroded

There is a crank and a camshaft position sensor. If you have verified both are working or replaced, pull negative battery cable for 2 hours or overnight. This should reset error codes.

follow this link it shows a great pic of its location.
http://www.paulstravelpictures.com/Nissan-Altima-Camshaft-Crankshaft-Sensors/Altima-Crankshaft-Camshaft-Sensor-Replacement-038.html

should be a mark or line on the crankshaft pulley.It may be full of crude

your tach is run by the engine computer, possible cause. also by the crankshaft position sensor, most likely cause, I would start there. some sensors will run within perimeters and be bad enough to cause a lot of problems

P0340....Camshaft Position Sensor 'A' Circuit (Bank 1 or Single Sensor)
P0325....Knock Sensor 1 Circuit (Bank 1 or Single Sensor)if you have no spark it your cam sensor

In the kit there are two sensor that look identical. The one for the crankshaft has a white paint mark on it near the bolt hole. Make sure that it is in the right location.