My check engine light is on. What is triggering it?

Howard Automotive • Dec 27, 2023

If your check engine light flashes on, it doesn’t necessarily mean that disaster is imminent. However, you should promptly visit the shop for computerized diagnostics so that the issue can be identified and resolved before it gets worse. At Howard Automotive, we provide expert check engine light diagnostics and repair in the greater Kansas City area. Here are five common causes of an illuminated check engine light.


Catalytic Converter Issues

The catalytic converter reduces harmful emissions by converting carbon monoxide and other pollutants into less harmful gasses. If it fails, it can trigger the check engine light. Signs of a faulty catalytic converter include worsening acceleration and a smell like rotten eggs.


Faulty Oxygen Sensor

The oxygen sensor plays a pivotal role in monitoring the level of oxygen in the exhaust gasses. A malfunctioning sensor can lead to a decrease in fuel-efficiency and an increase in harmful emissions. If ignored, it may also cause problems with your catalytic converter. 


Loose or Missing Gas Cap

The gas cap helps maintain pressure in the fuel system and prevents fuel vapors from escaping. If it's not sealing properly, it might trigger the check engine light. Fortunately, you can prevent this issue by simply checking to ensure that your gas cap is tightly sealed after each time you fill up.


Malfunctioning Mass Airflow Sensor

The mass airflow sensor monitors the amount of air entering the engine and adjusts the fuel injection accordingly. A malfunctioning sensor can lead to a poor air-fuel mixture, affecting engine performance and MPGs. 


Ignition System Problems

Issues with the ignition system, such as faulty spark plugs or ignition coils, can trigger the check engine light. A misfiring engine can lead to reduced performance and increased fuel consumption. 


Check Engine Light Repair in Kansas City, MO

When you need diagnostics and auto repair in Kansas City and the surrounding area, contact Howard Automotive at (816) 439-7527. At our local auto shop, we can expertly handle your vehicle’s repair and maintenance needs. Feel free to give us a call today to make an appointment!


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