P0172 ERROR CODE: MEANING, SYMPTOMS, CAUSES AND SOLUTIONS (system too rich). In this video, we will discuss error code P0172, what causes it and how to fix it.

P0172 is an OBDII diagnostic trouble code that indicates that the engine control module (ECM) has detected a toorich fueltoair mixture in the engine's bank 1. In simple terms, this code indicates excessive fuel being injected into the engine's cylinders, resulting in poor fuel economy. The ECM monitors the oxygen sensors to determine the fueltoair mixture, and when it detects a rich condition, it will trigger the P0172 code. Though this error code is not serious, it can cause longterm damage to the engine if left unaddressed.


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