P0172 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

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Old 09-24-2009, 12:14 AM   #1
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Default P0172


System Too Rich (Bank 1)

The oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust).

You will more than likely not notice any drivability problems, although there may be a misfire.

A code P0172 may mean that one or more of the following has happened
  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters can cause the MAF to become dirty if the filter is over-oiled.
  • Vacuum leak.
  • Fuel pressure or delivery problem
  • Throttle position sensor
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