https://stream.echo6.co/videos/watch/2a235cae-6566-4ee8-8968-4084fcfa77d5 For More Info visit us at: https://1aau.to/h-cpp Do you have a check engine code P0303, which indicates an engine misfire on cylinder 3? In this video, Sue shows you how you can diagnose a misfire without any special tools, just by moving around the spark plug and ignition coil! From there, you can find out whether it is the spark plug or ignition coil that is causing the problem, and replace it yourself! This video focuses on cylinder 3 of a 6 cylinder engine, but the process would be the same for any cylinder on a 4, 6, 8, 12 cylinder engine! Check out this playlist for more great diagnostic tips from Sue and the rest of the 1A Auto crew! http://www.youtube.com/playlist?list=PL17C5A3ED23485B90 Subscribe: https://www.youtube.com/channel/UCVvE8kQTuZEykvMFZBVzftg?sub_confirmation=1 📱 Download the 1A Auto Repair App for more videos, torque specifications, and car repair information: https://1aau.to/appdownloadyt 🚗 For More Info visit us at https://1aau.to/h-cpp ⚠ DISCLAIMER: While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video. Wed, 15 Apr 2026 11:41:42 GMT https://validator.w3.org/feed/docs/rss2.html PeerTube - https://stream.echo6.co https://stream.echo6.co/client/assets/images/icons/icon-512x512.png https://stream.echo6.co/videos/watch/2a235cae-6566-4ee8-8968-4084fcfa77d5 All rights reserved, unless otherwise specified in the terms specified at https://stream.echo6.co/about and potential licenses granted by each content's rightholder.