ANSWERED: Where is Bank 1 Sensor 2? (Ford Explorer) - CarGurus.ca
Check engine light Codes: P0172 “System Too Rich (Bank 1)” & P016B “Closed Loop Air/Fuel Ratio Control At Limit - System Too Rich” | Hyundai Veloster N Forum
P0420 Code: Catalyst System Efficiency Below Threshold (Bank 1) - In The Garage with CarParts.com
P0172 Code: Fuel System Too Rich (Bank 1) - In The Garage with CarParts.com