Engine light & VTM-4 on the dash (P0172 code)

Have been seeing Engine light and VTM-4 lights on & off for the past few years. When scanned it showed "P0172 Rear bank (bank1) fuel system too rich". Is this due to bad MAP sensor? I tried to clean once a ~yr ago.
Any guidance on how to fix? If I were to replace the MAP sensor is it recommended to go with OEM or any reputable aftermarket model?
Thanks