Audi 2010 Q5 with check engine intermittent
 

Hello guys,
I have a 2010 Audi Q5 with 95k miles. Recently, the check engine light came on and sometimes would stay on for a few days and disappear. When I sent to get a smog, it originally did not pass and I was told to change the mass flow sensor. I changed it and it check engine light went off but came back again a week later. Has anyone had this problem and do I actually have to replace the throttle body? That is an expensive part and wanted to check around before I actually pull the trigger.
Thank you and would love some advise.

Matt