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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  • 68 Answers

  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 could only find the 2 codes for you
try here
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Need info for codes


P0171 System too Lean (Bank 1)
P0300 Random/Multiple Cylinder Misfire Detected
check for vacuum leaks
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the other 2 codes could be related to these 2 codes and are manufacturer specific codes
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take sample of your fuel into clear plastic bottle from fuel line
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this can cause these codes and then not go on storing codes for other bank even though that bank will be missfiring also due to water & P0300 Random/Multiple Cylinder Misfire Detected being logged
check all connections to coils/leads & wiring connectors
due to miss fire codes for cyl 1,3,5 all on the same bank
also look and check for air leaks on that bank (hose knocked off or splithose)inlet manifold gasket,brake booster etc...
3 injectors being blocked slightly on same bank posible!!!
check wires and signal

was it running like this b4 tune up & repairs?
this is what codes are
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P0300 Random/Multiple Cylinder Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0303 Cylinder 3 Misfire Detected
P0305 Cylinder 5 Misfire Detected

the last code is for trans due to misfire/running lean on bank 1 probably a torque problem code
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This might help. It looks like you O2 sencor had gone bad or the signal has and causing multiple mis fire. according to your codes. 
PO171 System too Lean (Bank 1

PO174 System too Lean (Bank 2)

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Causes of PO300
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Running out of gas, or poor fuel quality
Evaporative emissions system (EVAP) concerns: fuel vapors leaking into engine
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EGR system concerns

I'ld start with chaning the O2 sensors first but sheck for bad wire connection. Hope this helps and good luck

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I would be looking at the front passenger side oxygen sensor for issues. It may be bad, it may not be plugged in, bad wiring at harness.

The random misfire may be symptomatic of the o2 sensor problem.

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