A check engine light is often a nuisance for most drivers since the warning could mean several potential issues with the car. However, there is no need to panic. If the light is solid, there is an issue that needs attention at your earliest convenience. If the light is flashing, however, you need to pull over immediately and contact an auto repair shop. Here are the most likely causes for the check engine light.

Why Is the Check Engine Light On?

1. Bad Oxygen Sensor

Your car's oxygen sensor monitors the amount of oxygen in its exhaust. An element within the exhaust pipe produces voltage out of that oxygen in the exhaust. If that level of voltage falls below a certain point, it will trigger the check engine light to engage.

2. Loose Gas Cap

If your gas cap is loose, missing, or cracked, the fuel system is no longer properly pressurized. When your car performs its regular systematic diagnostic check and finds that this is the case, it will trigger the check engine light to illuminate. You'll also lose fuel from evaporation until you can make it to the auto repair shop for a replacement.

3. Failed Catalytic Converter

The catalytic converter breaks down harmful compounds in your car's exhaust using platinum-covered ceramic and heat. By super heating these compounds, the converter converts them into harmless molecules of carbon dioxide or water. When the catalytic converter fails, oxygen sensors will detect the change and trigger the check engine light.

4. Worn Spark Plugs

Spark plugs ignite the mixture of fuel and air that enters your car's combustion chamber. This small spark triggers the combustion that creates the engine's power. When a spark plug becomes worn or cracked, it will trigger an engine misfire code and light up the check engine light on your dash.

If your check engine light is on and you're not sure why, you can count on The Shop Auto Service in Cincinnati, OH. This auto repair shop has provided high-quality repairs and exceptional customer service since 1970. Their ASE-certified technicians are familiar with all makes and models and can have your car diagnosed in no time. Visit their website to see a full list of services, and call (513) 861-4445 to schedule an appointment.