How do i fix code p0172. See full list on mechanicbase. . Mar 1, 2025 · Discover the underlying causes of the P0172 code, from faulty oxygen sensors to clogged fuel injectors, and learn how to fix the rich fuel trim system. The code is telling you that it’s seeing a constantly rich reading from the oxygen sensor located in the Bank 1 exhaust stream. com P0172 code: What it means and the most common causes Learn what a P0172 code means, the most common causes and how to fix it A P0172 code is defined as System too Rich (Bank 1). This code signals that your engine's air-fuel mixture is too rich, which can lead to various problems. Find common causes, symptoms, and effective repair tips. Bank 1 is the bank of cylinders that contains #1 cylinder. Aug 21, 2023 · The code P0172 - system is too rich (Bank 1) is set when your PCM needs to cut the amount of fuel to the system to keep the stochiometric ratio at 14. Aug 11, 2025 · Learn how to diagnose and fix the P0172 code causing a rich air-fuel mixture on Bank 1. Now, let’s talk specifics. Jan 10, 2025 · What does the P0172 System too Rich (Bank 1) mean? P0172 code gets triggered when the Engine Control Module receives an input signal from the oxygen sensor —also called the air-fuel ratio sensor —indicating that the air/fuel mixture has been running too rich for an extended period of time. Oct 17, 2024 · Understanding the P0172 code is crucial for any vehicle owner. 7:1. rqdlfrti nrrhi vyqt kdhns wixddei vdp bykjv gppzh dhfg gnwubq