Common Causes of a Check Engine Light?

There’s nothing more frightening to you and your wallet than seeing that dreaded orange light flash up on your dashboard. Causes can range from a totally drivable car that just needs to be taken in eventually, all the way to a serious issue that needs to be addressed immediately. In this article, we’ll be going over the common causes of a check engine light and what to do about it.

Dirty or Faulty Mass Airflow Sensor (MAF)

The mass air flow (MAF) sensor measures the amount of air entering the engine, allowing the engine control unit to inject the proper amount of fuel for efficient combustion. If the MAF sensor fails or becomes contaminated by dirt and debris, it can cause issues with fuel economy, engine performance, or even lead to stalling. A failed or dirty MAF sensor will often trigger the check engine light and may result in poor acceleration and reduced fuel efficiency.

Loose or Faulty Gas Cap

One of the most common causes of the check engine light to illuminate is a loose or faulty gas cap. If your vehicle’s gas cap is not tightened properly or the seal is cracked, it may cause a pressure drop in the fuel system, triggering the light. This is often overlooked, but it’s a quick fix: either tighten the cap back on or replace the cap entirely. If the check engine light doesn’t turn off after this, you may need to have a trusted mechanic work on your car.

Oxygen Sensor Issues

Your vehicle’s oxygen sensors (or O2 sensors) are responsible for monitoring the oxygen content of the engine’s emissions, and by extension, the air-fuel ratio within the combustion chambers. This helps the engine’s computer adjust the fuel-to-air ratio, which ensures your engine runs at optimal efficiency. A malfunctioning or damaged oxygen sensor can lead to poor fuel economy and increased emissions. If allowed to linger, it can gradually also cause more extensive engine damage over time.​

Worn-Out Spark Plugs

Spark plugs are essential for igniting the air-fuel mixture in your engine’s cylinders. Over time, these crucial components will gradually wear and will eventually fail. A faulty or failed plug can cause the engine to misfire, idle roughly, or even struggle to start. This can trigger the check engine light, and continuing to drive with worn-out spark plugs can lead to reduced performance, lower fuel efficiency, and increased emissions. If you suspect spark plug issues, it’s necessary to have your vehicle inspected by a trusted professional as soon as possible to prevent further issues and potential damage to your engine. ​

Catalytic Converter Issues

The catalytic converter reduces harmful emissions from your engine and plays a critical role in the exhaust system. If it becomes clogged or damaged, your car may experience a loss of power, poor acceleration, reduced fuel efficiency, and the inability to pass emissions tests in applicable areas. The check engine light can also come on as a result of a faulty catalytic converter. This issue is typically more expensive to repair, so it’s crucial to address it as soon as you notice any symptoms like sluggish acceleration or strange exhaust odors.

Dont Ignore the Check Engine Light

While the check engine light may indicate a minor issue, it’s always smart to have it checked out. Ignoring the warning could lead to more expensive repairs down the road and raise overall safety concerns. The best course of action is to have your car diagnosed by a trusted service facility. Many auto repair shops offer diagnostic services that can pinpoint the source of your issue. From there, it can be decided whether it’s an easy fix or if a more serious repair is needed.

Check Engine Light Diagnostics and Service In North Idaho

The check engine light doesn’t always mean disaster, but it’s crucial to identify the cause of it quickly to avoid further issues. Luckily, at Lake City Auto Care, our team has extensive experience in diagnosing and repairing engine issues on a wide variety of makes and models. We have locations in Coeur d’Alene, Rathdrum, and Hayden. Call or schedule online with us today!