DTC P0175: 2/1 Fuel System Rich: Description

Fuel system rich condition is monitored with engine running in closed loop mode, ambient/battery temperature at more than 20°F (-6.7°C), and at altitude less than 8000 feet. DTC will set in Powertrain Control Module (PCM) memory when PCM senses fuel system is running too rich on 2 sequential trips. Possible causes for DTC to set are: restricted fuel supply line, fuel pump inlet strainer plugged, defective fuel pump module, defective 2/1 Heated Oxygen Sensor (HO2S), 2/1 HO2S signal circuit open or shorted to voltage, faulty EVAP system operation, defective Throttle Position (TP) sensor, TP sensor voltage more than .92 volt with throttle closed, binding throttle linkage, defective Engine Coolant Temperature (ECT) sensor, engine mechanical problem, defective fuel pressure regulator, defective Manifold Absolute Pressure (MAP) sensor or defective PCM.