Posted on February 7, 2024 by Rick Griffith

The check engine light is an ominous glow on any dashboard. Often leaving a driver wondering, “How much will this cost?” It’s that tiny yet attention-demanding indicator that something might be awry under the hood.

But what exactly triggers this vague light? In today’s blog, we’ll explore why the check engine light comes on, provide insights for used car buyers to be aware of, and shed light on potential issues that should never be ignored.

Understanding the Check Engine Light

Before we dive into the common reasons behind the illumination of the check engine light, it’s crucial to grasp its purpose and functionality. The check engine light is a warning system connected to the vehicle’s OBD system. It monitors various engine components and systems, signaling a potential malfunction or error.

Common Culprits: Faulty or Loose Gas Cap

A faulty or loose gas cap is one of the most frequent causes that trigger the check engine light. If the seal around the gas cap cannot create a tight vacuum, it can result in evaporative emissions escaping from the fuel system. Thankfully, there’s a simple fix to resolve this issue: tighten the gas cap securely or replace it if necessary.

Sensor Sensibility: Oxygen Sensor Issues

A malfunctioning oxygen sensor is another common culprit behind the check engine light illumination. The sensor measures the oxygen level in the exhaust, providing crucial feedback for the engine’s fuel-to-air ratio. A faulty oxygen sensor will decrease fuel efficiency and increase emissions. Replacing the sensor is usually the solution, although proper diagnostics are recommended to confirm the issue.

Ignition System Woes: Spark Plugs and Ignition Coils

An ignition system ensures the right amount of fuel-air mixture to ignite a spark within the combustion chamber to start an engine. If the check engine light illuminates, it’s likely due to a faulty spark plug or ignition coil misfire. Regular maintenance, including timely replacement of spark plugs and ignition coils, can prevent these issues and ensure optimal engine performance.

Tangled Web of the Emissions System

The emissions system is a complex network of components that reduces harmful pollutants. Any malfunction within this system, such as a faulty catalytic converter, can trigger the check engine light. Proper diagnosis and repair of emissions-related issues are vital for the vehicle’s smooth operation and for environmental reasons.

Bottom Line: Never Ignore the Check-Engine Light

In conclusion, the check engine light serves as an early warning system. While its illumination can cause momentary panic, understanding its common reasons can help used car owners make informed decisions.

Whether it’s a loose gas cap, faulty sensors, ignition system woes, or issues within the emissions system, addressing these concerns promptly is essential for the longevity and performance of any vehicle. So, the next time the check engine light illuminates, approach it as an opportunity to ensure your car’s well-being and seek the necessary professional assistance.

Buying a Safe, Reliable Car

When buying a used car, it is important to find a safe, reliable one, whether from a dealer or an individual. Car Credit owner Rick Griffith says that ” every used car they sell undergoes extensive reconditioning to meet safety and reliability standards.”

Griffith says that their business focus is to ensure every vehicle at the dealership “drives off safely and reliably, regardless of the price.” You can request a detailed copy of the reconditioning expense at Car Credit. Any reputable dealer should provide this information.

Be sure to ask your personal mechanic to assess any used car before you buy. It could be the difference between safety and reliability. To speed up your car-buying experience, begin by reviewing Car Credit’s current online inventory and completing their online credit application today!

The team at Car Credit in Joplin, Missouri, is committed to ensuring that your car-buying experience is fast and efficient. Once you have completed the application, a Car Credit team member will contact you to address any questions you may have and schedule a time for you to test drive a car. Then you can begin finalizing your purchase.