Check Engine Light On? We Can Help!

Your check engine light could be on for a variety of reasons. It can be caused by something minor like a loose gas cap or a major problem such as a bad catalytic converter. Below are some of the top reasons for why your check engine light is on. To have it diagnosed by professionals, contact Menlo Park Chevron today!

  1. Oxygen Sensor needs replacing - The oxygen sensor measures the amount of unburned oxygen in the exhaust system. If you don't replace your oxygen sensor as needed, you can expect to your vehicle to: burn more fuel than necessary; lose fuel economy; get less miles per gallon; and damage your spark plugs and catalytic converter.

  2. Gas cap is loose, damaged, or missing - Gas caps seal the fuel system to maintain pressure in the gas tank and prevent fumes from being released into the air. If you don't tighten or replace your gas cap, your vehicle can lose gas through evaporation.

  3. Failing Catalytic Converter - Catalytic converters protects the environment by converting harmful carbon monoxide into carbon dioxide. If you don't replace a bad catalytic converter, you can expect a failed smog test; reduced performance and fuel economy; and high temperatures while the vehicle is running.

  4. Mass Airflow Sensor (MAF) needs replacing - The MAF measures the amount of air entering your car's engine to determine how much gas is needed to run efficiently. If you don't replace the MAF as needed, faulty sensors can damage spark plugs, oxygen sensors, or the catalytic converter; and your vehicle will experience reduced performance and fuel economy.

  5. Spark plugs needs replacing - Spark plugs ignite the air and fuel mixture in the combustion chamber of your vehicle. If you don't replace your spark plugs as needed, your vehicle will experience poor performance; reduced fuel economy; clogged catalytic converters; or damage to ignition coils and oxygen sensors.