5 Common Causes of the Check Engine Light

Few things interrupt your peace of mind behind the wheel quite like that small amber light glowing on the dashboard. But a check engine light doesn’t always mean something serious. More often, it’s your vehicle asking for a little attention, and understanding what it’s telling you puts you back in control. The Autobarn Mazda of Evanston covers five of the most common causes.

A Loose or Worn Gas Cap

Surprisingly, your gas cap is one of the most common causes for your check engine light. The gas cap seals your fuel system and prevents vapors from escaping. If it’s loose or cracked, it can set off the light. Try tightening it and driving for a day or two to see if the issue resolves.

A Failing Oxygen Sensor

Your oxygen sensor monitors unburned oxygen in the exhaust and helps maintain the right fuel-to-air balance. When it fails, not only will it trigger your check engine light, but your fuel efficiency also drops and emissions rise. Putting off repairing it can lead to catalytic converter damage, so it’s worth addressing early.

Worn Spark Plugs or Ignition Coils

Spark plugs create the combustion that keeps everything moving. Over time, they wear down, causing misfires, rough idling, and a Mazda check engine light. Ignition coils can fail too, and both are relatively affordable to replace when caught early.

Catalytic Converter Issues

The catalytic converter cleans harmful exhaust gases before they leave your vehicle. When it starts to fail, performance suffers. This one’s usually a downstream symptom of something else, like a neglected oxygen sensor or prolonged misfiring. Regular maintenance goes a long way toward preventing it.

Mass Airflow Sensor Problems

The mass airflow sensor measures incoming air so the engine receives the right amount of fuel. A dirty or failing mass airflow sensor can cause stalling, poor acceleration, and reduced fuel economy. Keeping up with air filter replacements helps protect it.

Fix Your Check Engine Light Woes in Evanston, IL

A check engine light is a conversation your car is starting with you, and you’ll want to listen. The service team at The Autobarn Mazda of Evanston can run a full diagnostic, identify the issue, and get you back to enjoying the drive. Stop by or schedule a visit and we’ll take it from there.