My check engine light wont go off

What is your question?

My car was sitting for a while, it would always start it would just lose power while it was running. The dealership advised me I should; 1 replace battery, 2 replace o2 sensor in bank 1 and 2, 3 flush the motor, 4 change oil and oil filter, 5 change oil pressure sending unit, and finally change the spark plugs. Everyone was done the car sounds great but it still loses power and the check engine light still comes on. Not to sure what the code is for the check engine light.