So, I just bought this car a few months back and everything back then was great no check engine light or anything like that. But few months passed and engine light kept coming on saying catalytic converter below threshold (p0420 & p0430) and now its permanently there and will not go away and on top of that, this engine is burning a lot of oil. Any time I check the dipstick it never shows a drop of oil unless it just had a fresh oil change. I watched you video and tried cleaning the PCV valve first and that made no difference at all, I tried using various cat cleaners to see if they would clean the cat but none of them worked at all. Are there certain steps I should take in order to figure out the problem or to even fix it? Please let me know and your help is greatly appreciated.