The P0172 diagnostic trouble code indicates that the engine control module (ECM) has detected an excessively rich air-fuel mixture on Bank 1 of the engine.
In simple terms, the engine is receiving too much fuel and not enough air.
When this happens, the Check Engine Light turns on, fuel consumption increases, and engine performance may decrease.
P0172 is one of the most common fuel-trim related OBD2 trouble codes worldwide.


