The P0302 is a misfire on cylinder number 2.
•Base engine problem that affects only Cylinder 2 (e.g., low compression)
•Check for air leaks in the Air Induction system (e.g., in the intake manifold)
•Check for air leaks in the EGR system and in its related hoses and/or valve
•Check for air leaks in the PCV system and in its related hoses and/or valve
•Fuel delivery component fault that affects only Cylinder 2 (i.e., a contaminated, dirty or sticking fuel injector)
•HO2S or AFS has failed (it may be contaminated with fuel, silicone or water)
•Ignition system problem (coil or plug) that affects Cylinder 2
As to the P0320 that is not a valid code. There is a P0327 and P0328. It is related to a possible knock sensor problem.
- PARTS GUY
Thanks so so so munch. after all the Cylinder 2 was damage we replaced it and now the car is working fine. Now I have to return the EGR Temperature Sensor. Thanks so so so so munch PARTS GUY!~!!! - Hey21