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What does it mean when my Honda says check emission system?

When your Honda displays a "Check Emission System" warning, it indicates that there is an issue with the vehicle's emissions control system. This system is responsible for regulating and monitoring the exhaust emissions from your Honda's engine, ensuring they meet environmental regulations.


Understanding the Emission System in Your Honda


The emission system in your Honda includes various components, such as the catalytic converter, oxygen sensors, and the engine control unit (ECU). These components work together to reduce the amount of harmful pollutants released into the atmosphere. When one or more of these components malfunctions, the "Check Emission System" warning light will illuminate on your dashboard.


Common Causes of the "Check Emission System" Warning



  • Faulty oxygen sensors: The oxygen sensors monitor the air-fuel ratio in the exhaust, and if they are not functioning correctly, the emission system cannot operate efficiently.

  • Catalytic converter issues: The catalytic converter is responsible for converting harmful exhaust emissions into less toxic substances. If the catalytic converter is damaged or malfunctioning, it can trigger the "Check Emission System" warning.

  • Problems with the engine control unit (ECU): The ECU is the brain of the emission system, and if it detects any issues, it will illuminate the warning light.

  • Leaks in the exhaust system: Cracks or holes in the exhaust system can cause the emission system to malfunction, leading to the warning light.

  • Faulty fuel system components: Issues with the fuel injectors, fuel pump, or fuel lines can also affect the emission system and trigger the warning light.


If you see the "Check Emission System" warning on your Honda's dashboard, it's essential to have the vehicle inspected by a qualified mechanic as soon as possible. Ignoring the warning can lead to further damage to the emission system and potentially result in higher fuel consumption, reduced engine performance, and even failure to pass emissions testing.


Addressing the "Check Emission System" Warning


When the "Check Emission System" warning appears, the first step is to have the vehicle's diagnostic system scanned for any trouble codes. These codes will provide the mechanic with valuable information about the specific issue causing the warning light. Once the problem has been identified, the mechanic can then proceed to repair or replace the faulty components, ensuring your Honda's emission system is functioning correctly.


Maintaining your Honda's emission system is not only important for the environment but also for the overall health and performance of your vehicle. By addressing any issues promptly, you can help ensure your Honda continues to run efficiently and meet all applicable emissions regulations.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.