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Code P1491 means Rad fan control relay circuit. on a 2002 Ram check the fuse for the ac condenser. it is a 25 am fuse and it is located in row closest to rad and closest to engine. if fuse is blown it will look a milky colour.I know this for a fact as I just had to change mine as it had blown. The condenser fan motor is probably going bad and that is what blows the fuse.

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Q: What is check engine code P1491 for 2002 dodge ram 1500?
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