When it rains, it pours. My car overheated and now my son's 2006 G35 threw the above listed codes. Should be an Upstream air fuel o2 sensor in the exhaust manifold. We were supposed to get it inspected for the first time Monday. I found one online and it should be here Friday. Anything I should know? I hear they are in a tough spot. I imagine there is a re learn procedure? And stupid question, it definitely won't pass correct? Even though it's before the cat? Thanks.