My check engine light came on, and I was told that p1003 camshaft sensor is a problem
SOURCE: 2002 saturn sl1 camshaft position sensor
I hate to tell you this, but there is not Camshaft Position Sensor on any 1.9L Single or Dual OHC. I assume you had someone read a Diagnostic Trouble Code from your PCM. They probably told you that you needed a Camshaft Position Sensor, and then offered to sell you one. I would recommend changing your spark plugs and your plug cables with FACTORY REPLACEMENTS. This will usually make the DTC go away. Aftermarket plugs and wires rarely work well for this engine. If you are looking for a CRANKSHAFT position sensor, look between the engine and transmission on the back side of the transmission. It is also known as the "transmission input speed sensor". More often than not though, your engine will not fire up if the Crank position sensor is not working. Hope this helps.
SOURCE: 2001 saturn sc2 gets code 341&340 camshaft sensor
if you have high resistance in secondary ign. system (plug wires, ign.coil) this will cause this code to set. make sure you are using a high quality spark plug wire set. not from autozone!!! and denso non platinum tipped spark plugs. also use a diaelectric grease on plug wires to keep moisture out.
SOURCE: I need to replace the crankshaft position sensor,
I think it's behind the motor inthe middle of the block. A crank sensor can set a cam code also.
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