2000 nissan sentra no ignition wont 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

Try crankshaft sensor

Have the fault codes read to find the faulty sensor/unit.

need to replace the camshaft sensor also in tandem w/crankshaft sensor. trouble codes need to be removed from computer. after repair. both the air & fuel filters need replaced. how's your oil change doin ? try this brandi, see if that takes care of it .

I have a 2000 Buick Centry and I'm having the same problem after having my mechanic to change my sensor twice, he said that it's an elelectrical problem.

There are several things that can cause your engine to not have spark. It could be a crankshaft position sensor or the circuits to the sensor, it could be the security system "thinking" that the car is being stolen and has the ignition system locked out. It could be the ignition voltage circuit to the ignition coils, etc., etc....

In any case, your ignition system must be diagnosed to find the cause. This would include scanning the computers that control your ignition and security systems for possible fault codes.

Sounds more like a dead battery. The one click you hear is the starter solenoid.
Turn on your headlights and try to start if your headlights go real dim your battery is dead.
If they stay bright then it could be your starter

Go to dealership they will give a diagram to locate every single one. I replace them on my daughter car. I believe there were three sensors. I exactly know what you are talking about. I had a hard time locating the back one right above the drive shaft on driver side.

There are two cam shaft sensors and one crank sensor Nissian did sell a kit at one time with all the sensors in it one cam sensor is in the left cylinder head a one is in the right cylinder head

no spark mean a crankshaft sensor damaged