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
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O2 Sensor / System too Rich Fault Codes, Seems to be running fine?? - Ranger-Forums - The Ultimate Ford Ranger Resource
How to Fix Error Code P0172 | [nonda Auto DIY Center] P0172 is one of the most common engine error codes, it stands for [System too Rich (Bank1)]. It indicates one of
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HELP CEL ON: Rich at idle bank 1 and 2 / Lean under load bank 1 and 2 - 6SpeedOnline - Porsche Forum and Luxury Car Resource
![P0172 System too rich Bank 1 - fuel injector issue? - Page 4 - Ford F150 Forum - Community of Ford Truck Fans P0172 System too rich Bank 1 - fuel injector issue? - Page 4 - Ford F150 Forum - Community of Ford Truck Fans](https://www.f150forum.com/attachments/f4/460881d1482699767-p0172-system-too-rich-bank-1-fuel-injector-issue-fuel-tank-pressure-sensor-location.jpg)