{"id":76846,"date":"2025-04-24T11:11:55","date_gmt":"2025-04-24T16:11:55","guid":{"rendered":"https:\/\/www.emanualonline.com\/blog\/?p=76846"},"modified":"2025-06-04T03:31:49","modified_gmt":"2025-06-04T08:31:49","slug":"p0304-obd2-cylinder-4-misfire-detected","status":"publish","type":"post","link":"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected","title":{"rendered":"P0304 OBD2: Cylinder 4 Misfire Detected"},"content":{"rendered":"<p>The P0304 code is a diagnostic trouble code (DTC) indicating a misfire in cylinder number four of your vehicle&#8217;s engine. This code is part of the OBD-II system intended to monitor engine performance and emissions control.<\/p>\n<h2>What Does the P0304 Code Mean?<\/h2>\n<p>OBD-II Code P0304 is defined as a Misfire Detected in #4 Cylinder. This means that the engine control module (ECM) has recognized that cylinder four is not firing correctly, leading to incomplete combustion and potential engine performance issues.<\/p>\n<h2>What Causes the P0304 Code?<\/h2>\n<ul>\n<li>Worn out spark plugs or ignition components<\/li>\n<li>Incorrect ignition timing<\/li>\n<li>Vacuum leaks<\/li>\n<li>Low or weak fuel pressure<\/li>\n<li>Defective EGR system<\/li>\n<li>Faulty Mass Air Flow (MAF) Sensor<\/li>\n<li>Malfunctioning Crankshaft or Camshaft Sensor<\/li>\n<li>Defective Throttle Position Sensor<\/li>\n<li>Mechanical engine problems (e.g., low compression, leaking head gaskets)<\/li>\n<\/ul>\n<h2>What Are the Symptoms of the P0304 Code?<\/h2>\n<ul>\n<li>Check Engine Light flashing<\/li>\n<li>Rough engine running, hesitation, or jerking during acceleration<\/li>\n<li>Performance issues such as stalling at stop signs<\/li>\n<li>Rough idling and decrease in fuel economy<\/li>\n<\/ul>\n<h2>How Serious Is the P0304 Code?<\/h2>\n<p>The P0304 code is considered urgent as it indicates a significant problem that can lead to severe engine damage if not addressed promptly. Continuing to drive with this code could result in costly repairs down the line.<\/p>\n<h2>How to Diagnose the P0304 Code<\/h2>\n<p>To diagnose the P0304 code, follow these steps:<\/p>\n<ol>\n<li>Check the vehicle&#8217;s freeze frame data and replicate the conditions that triggered the code.<\/li>\n<li>Inspect ignition system components for wear, including spark plugs, ignition wires, and coils.<\/li>\n<li>Look for vacuum leaks and check fuel pressure.<\/li>\n<li>Utilize a scan tool to monitor RPM and misfire counters.<\/li>\n<li>Perform a compression test and manifold vacuum test to assess mechanical health.<\/li>\n<\/ol>\n<h2>Common Repairs for the P0304 Code<\/h2>\n<ul>\n<li>Replacing worn spark plugs or ignition components<\/li>\n<li>Repairing vacuum leaks<\/li>\n<li>Adjusting ignition timing<\/li>\n<li>Repairing or replacing defective sensors<\/li>\n<li>Performing engine mechanical repairs if necessary<\/li>\n<\/ul>\n<h2>How Much Does It Cost to Fix the P0304 Code?<\/h2>\n<p>The cost to fix the P0304 code can vary greatly depending on the underlying issue. Basic repairs, like replacing spark plugs or ignition wires, may cost between $100 to $300. More extensive repairs, such as fixing mechanical engine problems, could cost upwards of $1,000.<\/p>\n<h2>Can I Fix the P0304 Code Myself?<\/h2>\n<p>While some basic diagnostics and repairs, like replacing spark plugs or inspecting ignition components, can be done at home with the right tools and knowledge, it\u2019s advisable to consult with a professional mechanic for complex issues. A thorough diagnosis will ensure that the root cause of the misfire is properly addressed, saving time and money on unnecessary repairs.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The P0304 code is a diagnostic trouble code (DTC) indicating a misfire in cylinder number four of your vehicle&#8217;s engine. This code is part of the OBD-II system intended to monitor engine performance and emissions control. What Does the P0304 Code Mean? OBD-II Code P0304 is defined as a Misfire Detected in #4 Cylinder. This &hellip;<\/p>\n","protected":false},"author":26,"featured_media":80607,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_uag_custom_page_level_css":"","footnotes":""},"categories":[11987],"tags":[],"class_list":["post-76846","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-p-obd2-codes-powertrain"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.6 (Yoast SEO v26.0) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>OBD2 Code P0304 \u2013 Causes, Symptoms, and Repairs<\/title>\n<meta name=\"description\" content=\"Learn all about the P0304 code, what causes cylinder 4 misfire, and how to diagnose and fix common issues to maintain optimal engine performance.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0304 OBD2: Cylinder 4 Misfire Detected\" \/>\n<meta property=\"og:description\" content=\"The P0304 code is a diagnostic trouble code (DTC) indicating a misfire in cylinder number four of your vehicle&#039;s engine. This code is part of the OBD-II\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected\" \/>\n<meta property=\"og:site_name\" content=\"eManualOnline Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/EmanualOnline\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/jee514\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-24T16:11:55+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-06-04T08:31:49+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"JC Landry\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:site\" content=\"@eManualOnline\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"JC Landry\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected\"},\"author\":{\"name\":\"JC Landry\",\"@id\":\"https:\/\/www.emanualonline.com\/blog\/#\/schema\/person\/e803434ab3cc70008b22b56253223403\"},\"headline\":\"P0304 OBD2: Cylinder 4 Misfire Detected\",\"datePublished\":\"2025-04-24T16:11:55+00:00\",\"dateModified\":\"2025-06-04T08:31:49+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected\"},\"wordCount\":432,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.emanualonline.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.emanualonline.com\/blog\/p0304-obd2-cylinder-4-misfire-detected#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected.png\",\"articleSection\":[\"P Codes - 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He also loves cats, Johnny Cash and Subarus.","sameAs":["https:\/\/www.facebook.com\/jee514","https:\/\/www.instagram.com\/rat_in_chief\/","https:\/\/www.linkedin.com\/in\/jean-claude-landry-857781186\/"],"url":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"}]}},"uagb_featured_image_src":{"full":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected.png",1200,675,false],"thumbnail":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-150x150.png",150,150,true],"medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-300x169.png",300,169,true],"medium_large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-768x432.png",618,348,true],"large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-1024x576.png",618,348,true],"1536x1536":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected.png",1200,675,false],"2048x2048":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected.png",1200,675,false],"tie-small":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-110x75.png",110,75,true],"tie-medium":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-403x215.png",403,215,true],"tie-large":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-310x205.png",310,205,true],"slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-660x330.png",660,330,true],"big-slider":["https:\/\/www.emanualonline.com\/blog\/wp-content\/uploads\/2025\/05\/p0304-obd2-cylinder-4-misfire-detected-1050x525.png",1050,525,true]},"uagb_author_info":{"display_name":"JC Landry","author_link":"https:\/\/www.emanualonline.com\/blog\/author\/jclandry"},"uagb_comment_info":0,"uagb_excerpt":"The P0304 code is a diagnostic trouble code (DTC) indicating a misfire in cylinder number four of your vehicle&#8217;s engine. This code is part of the OBD-II system intended to monitor engine performance and emissions control. What Does the P0304 Code Mean? OBD-II Code P0304 is defined as a Misfire Detected in #4 Cylinder. 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