What Is Your Check Engine Light Trying to Tell You?

Seeing the check engine light come on can be stressful, especially when you aren’t sure what caused it. While a check engine light doesn’t always mean there’s a major problem, it should never be ignored. Your vehicle’s computer monitors many different systems and components. When it detects something outside of the expected range, it can turn on the check engine light. So, what could be causing it?

1. A Loose or Damaged Gas Cap

One surprisingly common reason for a check engine light is a loose or damaged gas cap. Your fuel system is designed to remain sealed. If the gas cap isn’t tightened properly or the seal is damaged, your vehicle may detect a leak in the evaporative emissions system and turn on the light. If you recently filled up your tank and noticed the light afterward, checking the gas cap is a simple first step. However, if the light stays on, there may be another issue that needs to be diagnosed.

2. An Oxygen Sensor Problem

Oxygen sensors monitor the amount of oxygen in your vehicle’s exhaust. This information helps the engine computer maintain the proper air and fuel mixture. A failing oxygen sensor can affect fuel economy and engine performance and may cause the check engine light to come on. Because several problems can produce similar symptoms, proper diagnosis is important before replacing parts.

3. Worn or Failing Spark Plugs

Spark plugs play an important role in the combustion process that powers your engine. When spark plugs become worn or develop problems, your engine may misfire. You might notice rough running, reduced performance, poor fuel economy, or difficulty starting. A misfire can also trigger the check engine light.

4. Catalytic Converter Problems

The catalytic converter helps reduce harmful emissions from your vehicle’s exhaust. If it isn’t working properly, you may notice reduced engine performance, decreased fuel economy, or a check engine light. Ignoring a problem with the emissions system can sometimes lead to more expensive repairs, so it’s worth having the vehicle checked.

What Should You Do When the Check Engine Light Comes On?

The first thing to determine is whether the light is steady or flashing. A steady check engine light generally means the vehicle has detected a problem that should be diagnosed. A flashing check engine light can indicate a more serious issue, such as an active engine misfire. If this happens, avoid continuing to drive the vehicle unnecessarily and have it inspected as soon as possible.

Don’t Guess. Get the Problem Diagnosed

A check engine light doesn’t tell you exactly which part has failed. It provides a starting point for diagnosis. At MotorAbility, we can help determine why your check engine light is on and what your vehicle may need. If you’re looking for check engine light diagnostics in Green Bay, WI, contact MotorAbility to schedule service.