Why am I getting Code P0172 too rich bank 1. Recently replaced maf sensor.

Autozone is a High end "Parts" Retail sales company and they offer this free service to read your codes with a code reader and try and convince you to buy parts that most of the time do not fix your problem(s)! They don't have the proper testing tools nor the knowledge to diagnose your vehicle,they sell parts. The code you have does not mean to replace the MAF Sensor,it's a generic code and a starting point only. https://www.autocodes.com/p0172_buick.html