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help with an engine light

Discussion in 'Civic - EP, FA, FG' started by 91_stylin_civic, Apr 25, 2010.

  1. 91_stylin_civic

    91_stylin_civic Member

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    I got an 02 civic si with an engine light on. code PO172B bank 1 system too rich. I was wondering if anyone has come acrossed this code that could help me out. The O2 sensor is switching and was replaced about 2 months ago. No miss firing. If anyone has any input for me that would be great. Thanks
     
  2. 8secHonda

    8secHonda New Member

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    code P0172 may mean that one or more of the following has happened:
    The MAF (Mass Air Flow) Sensor is dirty or faulty. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
    There could be a vacuum leak
    There could be a fuel pressure or delivery problem
    Possible solutions include:

    Inspect all vacuum and PCV hoses, replace if necessary
    Clean the MAF sensor.
    Inspect fuel lines for cracks, leaks, or pinches
    Check the fuel pressure at the fuel rail
    Check the fuel injectors, they may be dirty.
    Check for an exhaust leak before the first oxygen sensor (this is unlikely to cause the problem, but it is possible)
     
  3. 91_stylin_civic

    91_stylin_civic Member

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    thank you. I was thinking it maybe dirt on the sensor, the kid just changed his air filter like 2 wks ago. The old filter was nasty. I will let you know how i make out
     
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