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Fault Code Definition

  • OBD II P0172 Fuel System Too Rich (Bank 1)
  • OBD II P0175 Fuel System Too Rich (Bank 2)
P0175 Symptoms

  • Check Engine Light will illuminate
  • In some cases, no adverse conditions may be noticed by the driver
  • In other cases, there may be performance problems, such as a lack of power on acceleration and some "coughing" or misfiring. The vehicle may have trouble idling, especially when warm or when sitting at a stoplight.
  • Other codes may be set, such as P0300 (random, multiple misfires)

Common Problems That Trigger the P0172 and P0175 Code


  • PCM software needs to be updated
  • Mass Airflow Sensor (MAF)
  • Defective Manifold Absolute Pressure Sensor (MAP)
  • Engine mechanical problems
  • Defective Oxygen Sensor
  • Defective Fuel Pressure Regulator
  • Defective Coolant and/or Air Temperature Sensor
  • Thermostat is stuck open
  • Ignition Misfires
  • Defective Throttle Position Sensor
  • Defective or restricted fuel return line
  • Defective Fuel Injectors


 

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1,649 Posts
They should add dirty air filter to the list.
Usually that is caused by the injectors stuck open
 

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2,555 Posts
Should add EGR valve also
 
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