16795
P0411 Sec.Air Inj.Sys. Incorrect Flow Detected

[b]16538
P0154 O2 Sensor Circ.,Bank2-Sensor1 No Activity Detected

17605
P1197 O2 Sensor Heater Circ.,Bank2-Sensor1 Electrical Malfunction

16684
P0300 Random/Multiple Cylinder Misfire Detected

16687
P0303 Cyl.3 Misfire Detected

16500
P0116 Engine Coolant Temp.Circ Range/Performance (A hose came loose and all the coolant was lost. That's fixed)


I'm thinking the problem is either the postcat 02 sensors or the maf cause the gas mileage has decrease noticeably. Plus I've had the same code "electrical malfunction" code for both postcat sensors. But what could cause the misfire. It only happened once when I lost the coolant and the car was beginning to overheat. The car runs smooth as usual.