Engine Misfire? Trouble Code P0303 Meaning, Diagnose Spark Plugs & Ignition Coils

Have you encountered check engine code P0303, signaling an engine misfire on cylinder 3? In a video, Sue demonstrates how to diagnose a misfire without specialized tools, by simply moving the spark plug and ignition coil. By doing this, you can determine if the issue is with the spark plug or ignition coil, and replace it on your own. This video focuses on cylinder 3 of a 6 cylinder engine, but the process can apply to any cylinder on engines with different cylinder counts. Explore more diagnostic tips from Sue and the 1A Auto team in their playlist.