There was only a visible cam sensor on '98-2001 Explorer 302's. If you have a distributor, your cam sensor is in the distributor. If you don't have a distributor, it is where the distributor used to be on the front of the intake manifold.
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cam sensor senses position of cam .coil sensor operates coilboth 2 entirely different parts of engine
There are a few symptoms when a car has a bad cam sensor. A few of these are sputtering, poor acceleration, and the engine stalling.
There is an intake and exhaust cam sensor, both are located at the front of the engine in the head. They have 2 wire/pin connectors. They intake cam sensor is the one on the driver's side. See orange circle in picture/link below.
P0455 and P0452 have to do with fuel vapor leaks, will not cause a starting problem. P0340 is a cam sensor code. You need to diagnose for a failed cam sensor.
cam shaft sensor controlled