The problem is instigated by the variable cylinder organization system switching on and off during light throttle conditions, at traveling speeds, or when driving on flat roads. The continuous swapping causes excessive oil ingesting and the trouble codes look when oil compression drops to the point where it can no longer function the VCM system. If there is a part that needs to fix, leave it to the experts. Unless of course, you are assured that you can behavior all these repairs at home. You will need moderately expensive extra equipment and tools for this though. When your car is ok, you can test the car engine by a test drive.