Question about 1999 Honda Civic

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2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced

Vehicle inspection report Failed
Fault Codes p0171:System too lean bank 1
p0300 random/multiple cylinder misfire detected
p0303 cylinder 3 misfire detected
p0304 cylinder 4 misfire detected

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  • 13 more comments 
  • gblanchette1 Feb 14, 2009

    I was unable to find a vaccum leak The car runs fine but will not pass the inspection test

  • gblanchette1 Feb 15, 2009

    Used strater fluid around intake

  • gblanchette1 Feb 16, 2009

    Diagnostic showed that Oxygen Sensor bank 1 may be bad I unplug it with the engine running it did not chang the way it ran is this a bad sensor I did find a vaccum leak on the intake it is missing a hose or a plug

  • gblanchette1 Feb 23, 2009

    replaced the intake gasket checked for leak found no leaks but the check engine light is on

  • gblanchette1 Mar 12, 2009

    This was not a vacuum leak or a sensor or electronic problem

    The gas pressure was to low 20pis needed to be 35pis adjusted electronic fuel pump all codes gone and passed inspection

  • yadayada
    yadayada May 11, 2010

    adjusted fuel pump pressure? doubt that. someone is pulling our leg here.

  • yadayada
    yadayada May 11, 2010

    I don't believe it runs fine or it would not have the misfire codes and O2 code's, how did u check the intake? did u use propane enrichment?

  • yadayada
    yadayada May 11, 2010

    check the intake gasket for vacuum leaks.

  • Anonymous Mar 12, 2014

    No spark at no 1&4 cylinders

  • Anonymous Mar 16, 2014

    Cylinder 6 misfire detected

  • Anonymous Mar 17, 2014

    Misfire cyl 1-2-3 misfire on start up running lean m so sick of my truck already

  • Anonymous Mar 17, 2014

    Won't pass

  • Anonymous Mar 22, 2014

    Getting misfire codes 2 3 4 5 6

  • Anonymous Mar 22, 2014

    Misfire code 2 3 4 5 6

  • Anonymous Mar 29, 2014

    cylinder misfire

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  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

Posted on Feb 14, 2009

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I would like to know what these codes mean


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