Mass Air Flow (MAF) Sensor and the Air Fuel Ratio Sensor and Cat Convert.

What is your question?

I am thinking of buying a 2001 Tacoma but am seeing lots of "famous 100k check engine" questions. This usually involves failure of the Mass Air Flow (MAF) Sensor and the Air Fuel Ratio Sensor or Cat Convert issues. Are these issues prevalent enough with this year that I should steer clear and start at 2002?? Once you fix the MAF or Air Fuel Ratio sensor, is it a one time fix or have to replace again possibly. Thanks!