I thought this might be interesting enough to pass on.
Our Avalon has 80K miles, and suddenly the check engine light came on, vehicle stability control light came on, and the cruise controls (both laser and standard) stopped working.
Testing indicated the MAF might be bad (low airflow indicated), and that was replaced. Tests showed airflow back to specs, fault lights went away for a while, but returned within 100 miles of driving.
MAF was replaced as "faulty", and air filter was replaced. This time, mechanic noted that there is a filter in the housing above the regular air filter and it was cleaned (seems to be integral with housing).
This fixed all the problems.
Thought this might help someone.