Why is the Engine Light ON?

If the light comes ON and stays ON, the On-Board Diagnostic (OBD) system has detected a problem. The OBD system monitors the vehicle performance and regulates engine speed (RPM), fuel mixture and ignition timing.

Engine Light common causes:


Loose or damage gas cap:

The gas cap is used to hold and maintain pressure in the gas tank. Loose or damaged gas cap will cause gasoline fumes to escape the gas tank to the atmosphere. Re-tighten or replacing the gas cap will fix the problem.

Damage catalytic converter:

The catalytic converter helps convert harmful exhaust gas into an environmental friendly gasses. Deterioration of the catalytic converter will trigger the engine light. Replacing the catalytic converter will fix the problem. If the catalytic converter is not totally damage, using high octane gas for a couple of weeks may repair the problem.

Damage Oxygen (O2) Sensor(s):

The oxygen sensors measures the amount of unburned oxygen exhausted by the engine. Replacing the oxygen sensor will fix the problem.

Engine Light other common causes:


  • Exhaust leaks
  • Intake leaks
  • Mass Air Flow Sensor
  • Spark plugs
  • Ignition coils
  • Fuel injectors

    How to read engine codes


    An OBDII scanner is the best alternative to read codes, although there some manufacturers have instructions on how to read the code using the engine warning light, using an OBDII scanner is more accurate.

    How to clear or erase engine light


    After the problem is fixed, the engine light can be cleared with an OBDII scanner or by disconnecting the car battery for more than 30 minutes.

  • Related Information


    Browse All Codes For Specific Model YearBeta
    Ford F150 1998 Ford F150
    1999 Ford F150
    2000 Ford F150
    2001 Ford F150
    2002 Ford F150
    2003 Ford F150
    Ford Fusion 2006 Ford Fusion
    2007 Ford Fusion
    2008 Ford Fusion
    2009 Ford Fusion
    2010 Ford Fusion
    2011 Ford Fusion
    2012 Ford Fusion
    Honda Accord 2008 Honda Accord
    2009 Honda Accord
    2010 Honda Accord
    Honda Civic 1996 Honda Civic
    1997 Honda Civic
    1998 Honda Civic
    1999 Honda Civic
    2000 Honda Civic
    Infiniti G35 2003 Infiniti G35
    2004 Infiniti G35
    2005 Infiniti G35
    2006 Infiniti G35
    Nissan Altima 2002 Nissan Altima
    2003 Nissan Altima
    2004 Nissan Altima
    2005 Nissan Altima
    2006 Nissan Altima
    2008 Nissan Altima
    2009 Nissan Altima
    2010 Nissan Altima
    2011 Nissan Altima
    2012 Nissan Altima
    Nissan Maxima 2005 Nissan Maxima
    2006 Nissan Maxima
    2007 Nissan Maxima
    2008 Nissan Maxima
    Nissan Pathfinder 2005 Nissan Pathfinder
    2006 Nissan Pathfinder
    2007 Nissan Pathfinder
    2008 Nissan Pathfinder
    2009 Nissan Pathfinder
    2010 Nissan Pathfinder
    2011 Nissan Pathfinder
    2012 Nissan Pathfinder
    Nissan Rogue 2008 Nissan Rogue
    2009 Nissan Rogue
    2010 Nissan Rogue
    2011 Nissan Rogue
    2012 Nissan Rogue
    2013 Nissan Rogue
    Nissan Sentra 2002 Nissan Sentra
    2003 Nissan Sentra
    2004 Nissan Sentra
    2005 Nissan Sentra
    2006 Nissan Sentra
    2007 Nissan Sentra
    2008 Nissan Sentra
    2009 Nissan Sentra
    2010 Nissan Sentra
    2011 Nissan Sentra
    2012 Nissan Sentra
    Toyota Camry 1997 Toyota Camry
    1998 Toyota Camry
    1999 Toyota Camry
    2000 Toyota Camry
    2001 Toyota Camry
    2006 Toyota Camry
    2007 Toyota Camry
    2008 Toyota Camry
    2009 Toyota Camry
    2010 Toyota Camry
    2011 Toyota Camry
    Toyota Corolla 2005 Toyota Corolla
    Toyota Echo 2000 Toyota Echo
    2001 Toyota Echo
    2002 Toyota Echo
    Toyota Highlander 2001 Toyota Highlander
    2002 Toyota Highlander
    2003 Toyota Highlander
    2004 Toyota Highlander
    2005 Toyota Highlander
    2006 Toyota Highlander
    2007 Toyota Highlander
    Toyota Prius 2004 Toyota Prius
    2005 Toyota Prius
    2006 Toyota Prius
    2007 Toyota Prius
    2008 Toyota Prius
    2009 Toyota Prius
    Scion xB 2005 Scion xB
    2006 Scion xB
    2007 Scion xB
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