Code 404 keeps coming up and I've replaced egr valve. Some houses cooliet tank

P0404 Saturn P0404 Saturn - Exhaust Gas Recirculation Open Position Performance Possible causes - EGR volume control valve stuck open or closed - Faulty EGR volume control solenoid valve - EGR volume control solenoid valve harness is open or shorted - EGR volume control solenoid valve circuit poor electrical connection - EGR temperature sensor and circuit What does this mean? When is the code detected? The PCM calculates an error based on the difference between the actual EGR position and the desired EGR position. The PCM sets the P0404 code if the error is too great. check for vaccum leaks on the engine,check all of them,and check again