Chrysler Repair: 2005 Chrysler 300C engine light stays on,, engine oil pressure, oil pressure switch

Question
I am getting code P0520 "engine oil pressure sensor/switch circuit malfuntion". I am using an OBD II PocketScan Code Reader. I reset the code and after about 15 miles of driving, the engine light comes back on and stays on. The car has about 48,000 miles on it. Should I replace the oil pressure switch. I noticed the problem after a very recent oil change at one of the popular drive through oil change franchises. I went and had another oil change after about 1500 miles of driving and no change, the light stays on.

Answer
Possible Causes  
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE  
RESISTANCE (G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT  
(G6) ENGINE OIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND  
RESISTANCE IN (F856) 5-VOLT SUPPLY CIRCUIT  
(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND  
RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT  
ENGINE OIL PRESSURE SENSOR  
PCM