Top 6 Reasons Why Your Check Engine Light Could Be On

February 21, 2019

1. A Loose, Missing, or Faulty Fuel Cap

This is one of the factors that ignite the check engine light. The gas cap prevents the gasoline from evaporating and also keeps the fuel system under the appropriate pressure. Should the gas cap be broken or missing, replace it immediately at your next service stop.

2. Oxygen Sensor Failure

This is the component responsible for monitoring unburned oxygen. It also monitors how much fuel you have. A faulty oxygen sensor if not attended to immediately could have damaging effects on the car’s catalytic converter.

3. A Damaged Catalytic Converter

This is part of the car’s exhaust system that is responsible for the turning of the carbon monoxide and other harmful gases produced during combustion into harmless compounds. With regular maintenance, catalytic converter failure can be avoided. Reduced fuel economy and low performance are common symptoms of a failed catalytic converter.

4. A Malfunctioned Mass Airflow (MAF) Sensor

This component is responsible for monitoring the amount of air that gets into the engine. Common symptoms of a MAF failure include reduced gas mileage, trouble starting, an abrupt change in the throttle pedal’s position, and stalling.

5. A Failed Exhaust Gas Recirculation (EGR) Valve

This is a system that lowers the volume of nitrogen oxide that emanates from the car’s engine enabling it to run more efficiently. It redirects the hot exhaust gases into the combustion chambers so that the fuel warms up and burn more easily. A clogged valve can be cleaned and re-installed.

6. Vacuum Leak

Every car has a vacuum system responsible for a wide array of functions. The brake, for example, is vacuum operated. Vacuum hoses dry out and crack over time as they are exposed to extreme cold and intense heat. Vacuum leaks can trigger your check engine lights. The safest way to avoid these spontaneous leaks is by scheduling regular car maintenance visits.