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Hey guys,

I have this 2007 mercury montego with 48k miles for about 4 months. I think that this car is the same as ford five hundred. I really like this big car but the check engine light always turns on and off by itself. The error code is p0340. I drove to a couple of local ford dealers. They replaced the camshaft position sensor and put off the light. The check engine light still comes back. Usually when I drive on highway for 1hr or longer, the light will be on. If I drive locally, the light will go away by itself after a couple of days. The car runs all right. Any people experienced the same thing? :(
 

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Yup. This is for taurus generations ending in '07, which were fleet tauruses with the vulcan engine, IIRC. If you have the 3.0 'tec, then your problem might stem from the crank sensor, which would cause the computer to maybe think the cam sensor is wrong, when it's reading accurate but the crank position sensor is out of synch.
 
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