I have a computer code p000d, it is a cam sensor. What will it cost to fix it?

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I have a engine light on I toke the charger to o reileys to get a idea why it wss on. He put the computer to it the code was p000d a cam sensor. Will I have to change out the cam? Or is there a sensor for the cam? What is a ball part cost to get it fixed any help for me I would appreciate it. Thx