10 Reasons Why Your Check Engine Light Is On



"Why Is My Check Engine Light On?"
You can instantly identify the check engine symbol in your car as the engine-shaped icon that accurately indicates when there is an issue with the engine. 
In this article, we review the top ten reasons why your check engine light may be on.


    1. The Gas Cap Is Loose 

    The key function of the gas cap is to typically prevent gasoline fumes from leaving the fuel tank and properly maintain the accurate system pressure. Check the proper fitting on the gas cap to effectively prevent any fluid leakage. 


    2. Oxygen Sensor Failure

    When your oxygen sensor is damaged, the vehicle typically burns more fuel than needed. It is naturally meant to carefully track the unburnt oxygen in the exhaust system.


    3. Mass Airflow Sensor Dysfunction

    When the mass airflow sensor fails, the vehicle cannot properly monitor the specific amount of air entering the engine, causing trouble to the vehicle while you drive across varying altitudes. 


    4. Spark Plug And Ignition Coil Failure

    The spark plug and ignition coil need to generate electricity to enable the air cylinders. When these key components are damaged, the vehicle is at risk of shutting down.


    5. Dysfunctional Spark Plug Wires

    When the wires connecting the spark plug fail to function properly, the ignition coil will be unable to efficiently transfer the electricity responsible for the functioning of the air cylinders.


    6. Failure Of Catalytic Converter

    A damaged catalytic converter is quite expensive to adequately replace. The primary function of this essential component is to efficiently convert carbon monoxide emitted during the combustion process into carbon dioxide. 


    7. Dead Battery

    The car's battery is definitely an important element of the vehicle. A dead battery will not allow the engine to start correctly. 


    8. Exhaust Gas Recirculation (EGR) Valve Failure

    The primary function of this component is to progressively reduce the nitrogen oxide emitted from the exhaust. If the EGR valve is clogged up, the car will not run efficiently.


    9. Vacuum Issues

    The car’s vacuum system ensures that the brake booster functions well and also lowers harmful emissions. A damaged vacuum would therefore negatively impact your car’s proper functioning. 


    10. Faulty Alarm

    An alarm that's poorly installed causes unnecessary trouble and drains out the battery. A faulty car alarm can also trigger your check engine light to flash, indicating that you need to replace it soon.


    Contact us at Jerry’s Ford of Leesburg Today!

    If you would like to seek professional advice, call our team of service experts at (703) 777-0000 or schedule your appointment online. The Service Staff and technicians at Jerry's Ford of Leesburg are highly trained on all factory services for your car.