The DTC codeP0171 is generic and basically gives us to understand that a very low condition has been detected in the oxygen sensor in bank 1, that is, there is an excess of oxygen in the exhaust gases. In the 6, 8 and 10 cylinder engines, bank 1 corresponds to the side of the engine that has cylinder 1.
This diagnostic code is very common and is activated by the Waterside Sensor, which provides an air reading which are: When the fuel leaves the engine and PCM cylinders of the powertrain. This reading is adjusted, in order to keep the motor running at an optimum ratio of 14.7: 1. In case there is a fault and the PCM cannot maintain it 14.7: 1, the diagnostic code P0171 is obtained.