Why is My Check Engine Light On?

The check engine light flashes when it senses that there's something wrong with the engine. The following list describes some reasons as to why your check engine light may be on.
The Gas Cap is Loose 
The function of the gas cap is to prevent gasoline fumes from leaving the fuel tank, which also helps in maintaining optimum pressure in the system. 
Oxygen Sensor Failure
The purpose of the oxygen sensor is to monitor any unburnt oxygen in the exhaust system. When the oxygen sensor fails to detect oxygen, the engine burns more fuel than needed, leading to the check-engine light illuminating itself.
Failure of the Catalytic Converter 
The catalytic converter is meant to convert carbon monoxide into carbon dioxide during the combustion process. When the catalytic converter is damaged, a replacement may prove quite expensive.
Dysfunctional Spark Plug Wires and Ignition Coil
The air cylinders in the car engine function properly with the help of the spark plug and ignition coil. Both components work together to generate electricity. The spark plug wires do the job of transferring the power from the coil to the spark plug. When there are any issues within this system, the check engine light will flash, and the car may also shut down unexpectedly.
Mass Airflow Sensor Dysfunction
When the mass airflow sensor fails to work correctly, the vehicle becomes incapable of tracking the amount of air entering the engine. The car will then face much trouble moving between different altitudes.
Exhaust Gas Recirculation (EGR) Valve Failure
The engine emits nitrogen oxide when it is on, and this emission stays in control with the help of the EGR valve. We suggest checking your EGR valve for clogging or damage regularly.
Vacuum Issues
The vacuum system will not be able to lower harmful emissions and overlook the functioning of the brake booster. 
Faulty Alarm
A faulty alarm system drains the car battery and damages the engine. The alarm should be fitted properly by a trained mechanic to prevent any damage to the engine.

Contact Kelly Mitsubishi's Service Department Today! 
If you'd like to seek professional help when it comes to the check-engine light, you can have your engine checked for any issues at Kelly Mitsubishi in Emmaus, Pennsylvania.