Dose a 99 pathfinder have a camshaft position sensor, and where is it located?

Hello, Yes they do, but I do not recommend changing it blindly. WIthout diagnostics, this vehicle may never run, and you still will have spend plenty of money on parts. It may be a cheaper, faster, and better bet to have it professionaly diagnossed and/or repaired. The crankshaft and camshaft position sensor data can be read by a professional scan tool without ever opening the hood. Start by scanning the vehicle for trouble codes, scanners are cheaper than sensors in most cases.