Actually I bought a used Corolla 2002 with 120K which seemed fine and the driving is fine.
After I bought it, I just found out that the seller has removed the check engine light.
When I read the ODB codes, It shows three codes of 0171, 0420, 0441. Also I have recently found out that the engine burns excessive amount of oil. (about a quarter per 200 miles).
Actually the driving of the car is fine and as long as I add oil engine it seems fine.
I think all of these errors might be just due to a small problem like a broken valve (since it’s not high milage). It seems that there is no vaccum leak from hoses as well.
Does somebody have any idea what is the problem? and what should I check first?
I really appreciate.