![]() In addition, here are some additional causes of throwing code PO172. The most common reasons include a faulty oxygen sensor or a dirty mass air flow sensor (MAF). There are several reasons why this problem could exist. Strong fuel or rotten egg smell from exhaust.But in addition to that, here are some additional symptoms: Normally, your check engine light will be on (unless the bulb is burnt out). The symptoms of trouble code P0172 are usually the same symptoms of an engine running rich. Related: Bank 1 vs Bank 2 (Locate the Right Oxygen Sensor) Symptoms of Code P0172 If the engine control unit detects the bank 1 cylinder is “too rich,” it means it has too much fuel and not enough in oxygen. This ensures the engine generates the most amount of power possible with the least amount of fuel. The normal ratio is 14.7:1 for most gasoline engines. If the sensors detect that there is very little oxygen present, it means the ratio of air-to-fuel is not where it needs to be. The oxygen sensors measure the quantity of oxygen in the exhaust gases that are in this cylinder. The term “Bank 1” refers to the area of the engine that has the first cylinder, which is technically cylinder #1. Whenever there is too much fuel, that means there is not enough oxygen. These include the manifold absolute pressure, mass air flow sensor, and the oxygen sensors. There are several sensors and instruments used to detect the quantity of fuel within the exhaust gases of the chamber. If the unit detects that too much fuel is in the combustion chamber, the powertrain will generate diagnostic trouble code (DTC) P0172. Your engine control unit is constantly monitoring and communicating with the sensors of your fuel injection system.
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