Hi, a P0018 definition is Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A). A P0022 definition is "A" Camshaft Position - Timing Over-Retarded (Bank 2).
More info on the P0022 code @ http://www.obd-codes.com/p0022
As for the cost to fix, I'm not sure off-hand. A qualified technician should be able to diagnose that likely within 1-2 hours of shop time.
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