I have been reading some of the stuff posted but it seems that no one with this problem has an 04 altima. Which sensor is the right crankshaft position sensor? Is it the one near the driver side front tire or is it behind the engine? I took both of them out and the one behind the engine looks different from what the cam/crankshaft sensor looks like. The camshaft sensor and the sensor that I removed from the driver side front tire area are also different. This is driving me nuts. I don't want to just keep buying parts if they are not the right ones.......