P0172 — code definition

P0172 is a trouble code that is set when the ECU detects too much gasoline in the engine’s air-fuel mixture.

OBD2 code P0172 indicates that the exhaust gases exiting the combustion chamber contain an excessive amount of gasoline. The mass air flow sensor (MAF), oxygen sensors, and manifold absolute pressure (MAP) all used by the ECU to keep track of the engine’s air-fuel ratio. For V6, V8 and V10 engines, Bank 1 is located at the side of the engine that contains cylinder #1.