Once they fail, they will throw misfire fault codes such as P0300 and cause your engine to shake. If spark plugs are not changed at the recommended interval, they will eventually start to wear or, even worse, stop working. Many Honda owners don’t realize that spark plugs must be changed between the 60,000 and 100,000-mile mark. Honda cars last a long time, but spark plugs don’t. Let’s look at some common problem that triggers the Honda check engine light to stay on. Auto parts stores such as Advance Auto Parts and Autozone will scan the codes for you free of charge. If you don’t have an OBD2 scanner, visit a Honda dealer or an auto mechanic. Write down the code and search for the fault code online. Scroll up and down to see all stored codes. Your first code will show up, such as P0300 – Cylinder Misfire. Allow your scanner to turn on and communicate with the Engine Control Unit (ECU).Locate the OBD-II port under the dashboard, driver’s side.The YOUCANIC Full System Scanner can read and clear the code, giving you a good idea of what is causing the check engine light to stay on. ![]() Honda-specific scanners will provide more information and scan more systems than a generic scanner. If your Honda check engine light is on, the first thing that you, your mechanic, or your dealer should do is scan the engine codes using an OBD-II scanner. ![]() This may include inspecting the engine, emissions system, sensors, and wiring.įor example, if a DTC indicates a problem with an oxygen sensor, the mechanic would inspect the sensor for damage or malfunction and also check for any other issues that may be affecting the sensor’s performance, such as a vacuum leak or a clogged fuel injector. Once the DTCs have been read, the mechanic would perform a thorough inspection of the vehicle’s systems to identify the cause of the problem. Another code could be P0420, indicating that the catalytic converter is not working efficiently. The DTCs will give a specific code, such as P0171, which indicates that the engine control module (ECM) has detected a problem with the fuel system, specifically a lean condition in the fuel mixture. ![]() These codes can provide information about the issue causing the CEL to come on. How to Diagnose Honda Check Engine LightĪs a mechanic, the first step in identifying the cause of a Honda check engine light (CEL) would be to use a diagnostic tool to read the vehicle’s diagnostic trouble codes (DTCs). This would be the case with a loose gas cap. The Honda check engine light may come on in some cases, but no other symptoms are present. Emission System Problem message on the dashboard.In addition to the check engine light (CEL) coming on, you may also notice the following. Driving a car when the check engine light is flashing will damage your catalytic converter and cause the engine to overheat. It is not recommended to drive your Honda if the check engine light is flashing. The engine will shake, and you will notice a poor throttle response. How to Diagnose Honda Check Engine Light.
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