Causes and Fixes P0172 Code: Fuel System Too Rich (Bank 1)

How to fix P0172 Code: Fuel System Too Rich (Bank 1)
A Rich condition exists if the engine is getting more gas than air into the cylinders. (Air/Fuel Ratio is off.
(How a P0172 Code is triggered.) The oxygen sensor is reading the amount of oxygen burnt off during combustion and is reporting the information to the computer. The sensor is reading there is more oxygen than should be on Bank-1 side of the engine.
P0172 Code can be problematic to fix since it can be caused by several things.
Possible Causes of a P0172 Code:
Oxygen Sensor (Bank 1 Sensor 1)
Bad Fuel Injector
Vacuum Leak
Other Possible Causes but Usually Would also Cause Bank-2 Issues (P0175 Code: Engine Too Rich Bank 2)
Bad Mass Air Flow Sensor or Other Sensor
Blocked Air Intake
Bad Fuel Pressure Regulator or Fuel Pump
How To Test 02 Sensor Video
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By using this information user assumes all risk of use.

[@Discovery_and_Change]

I got the 'Bank 1 Too Rich' error at a smog station, then went to Auto Zone and their machine suggested I replace the Mass Air Flow Sensor, which I did and will now test drive and hope the 'check engine' light does not return 🤞

[@figgiefigueroa7372]

Thank you for sharing your knowledge!!!

[@joeybalogny6095]

great video

[@jslade7959]

I had a misfire check engine reporting on and off for 2 years with '14 GM Sierra 1500 5.3L. Decided to tackle it. Changed plugs, plug wires, ignition coils and all injectors (100k miles), why not. Now I'm sitting with a p219A (bank 1 air-fuel ratio imbalance and p0175 (system too rich bank 2). I've also replaced PCV Valve, Purge Cannister, and MAP Sensor. I can't win for losing. Both banks for long-term fuel trims sitting -30%. I'm feeling bad high fuel pressure pump since the regulator is built into it. Next up I'm smoking the evap system. Any ideas?

[@SFahad-bb2wx]

i am getting...P0101, P0172 and P0175.........i just replaced MAF sensor with a used one as at that time it was showing P0101 and P0102......any suggestion dear.....many times i clean MAF sensor, air filter is new.....how to start...what you suggest

[@ignaciobenavides1278]

Thanks you but I have po446 code I can't find it can you please help me

[@DJGalorenj]

I did a muffler delete. Would that cause it?

[@sheerwillsurvival2064]

👍🏻👊🏻