Check Engine Light Diagnosis

What Can Cause A Check Engine Light To Turn On?

There are many reasons why a check engine light can be activated. Some of the reasons your vehicle’s check engine light is on can be minor, while other reasons can be quite serious. Here’s a look at some of the top reasons your vehicle’s check engine light may be on:

• Loose Fuel Cap – Your check engine light can be activated if your vehicle’s gas cap is loose.
• Spark Plugs – Old or non-working spark plugs are the most common reason why a check engine light will be activated.
• Oxygen Sensor – The oxygen sensor measures how much-unburned oxygen is in your vehicle’s exhaust system. Too much or too little unburned oxygen can damage your vehicle’s engine.
• Catalytic Converter – The catalytic converter is an integral part of your vehicle’s exhaust system. A poorly functioning or non-functioning catalytic converter will activate the vehicle’s check engine light.
• Mass Airflow Sensor – The mass airflow sensor measures the air/fuel mixture in your vehicle’s engine. If the mixture level is off, then the check engine light will be activated.