{"id":9520,"date":"2021-06-04T02:05:00","date_gmt":"2021-06-04T09:05:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=9520"},"modified":"2024-05-27T18:30:31","modified_gmt":"2024-05-28T01:30:31","slug":"p0303-code-cylinder-3-misfire-detected","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0303-code-cylinder-3-misfire-detected\/","title":{"rendered":"P0303 Code: Cylinder 3 Misfire Detected"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column_bef309-e3 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column_bef309-e3 > .kt-inside-inner-col,.kadence-column_bef309-e3 > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column_bef309-e3 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column_bef309-e3 > .kt-inside-inner-col{flex-direction:column;}.kadence-column_bef309-e3 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column_bef309-e3 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column_bef309-e3{position:relative;}@media all and (max-width: 1024px){.kadence-column_bef309-e3 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column_bef309-e3 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column inner-column-1 kadence-column_bef309-e3 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-201276  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-a57948\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading_0e6a64-b1, .wp-block-kadence-advancedheading.kt-adv-heading_0e6a64-b1[data-kb-block=\"kb-adv-heading_0e6a64-b1\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading_0e6a64-b1 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading_0e6a64-b1[data-kb-block=\"kb-adv-heading_0e6a64-b1\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading_0e6a64-b1 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading_0e6a64-b1[data-kb-block=\"kb-adv-heading_0e6a64-b1\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading_0e6a64-b1 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading_0e6a64-b1\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li>Code P0303 stands for &ldquo;Cylinder 3 Misfire Detected&rdquo; which indicates that there have been numerous misfires in engine cylinder 3.<\/li><li>P0303 is typically caused by problems with the ignition system, faulty fuel injectors, or damage to the engine.<\/li><li>The most common symptoms of a P0303 are a lit check engine light, acceleration issues, and poor vehicle performance.<\/li><\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>A misfire occurs when there is an insufficient amount of fuel burning in a cylinder. Since the way the <a href=\"https:\/\/www.carparts.com\/blog\/car-engine-parts\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"engine\">engine<\/a> runs relies heavily on the proper functioning of its cylinders, a misfire can cause big problems. That&rsquo;s why the OBD-II code P0303 is considered a serious issue and should be addressed immediately.<\/p>\n\n\n\n<p>Find out what you need to know about this trouble code.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-engine-cylinder-head-taken-out-to-be-repaired-1024x683.jpeg\" alt=\"Car engine cylinder head taken out to be repaired\" class=\"wp-image-9522\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-engine-cylinder-head-taken-out-to-be-repaired-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-engine-cylinder-head-taken-out-to-be-repaired-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-engine-cylinder-head-taken-out-to-be-repaired-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-engine-cylinder-head-taken-out-to-be-repaired-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/05\/car-engine-cylinder-head-taken-out-to-be-repaired.jpeg 1516w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption> The P0303 code belongs to a series of diagnostic trouble codes starting from P0300 that refer to an engine misfire or incomplete combustion in one of the engine cylinders. <\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0303 Code Mean?<\/h2>\n\n\n\n<p>Diagnostic trouble code (DTC) P0303 stands for &ldquo;Cylinder 3 Misfire Detected.&rdquo; The code indicates that the powertrain control module (PCM), has counted enough misfire events on cylinder 3 to store the misfire code for that cylinder.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<p>Cylinder number 3 would refer to the third cylinder as the cylinders are numbered.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Cylinder number 3 would refer to the third cylinder as the cylinders are numbered.<\/p><cite>&ndash;<a href=\"https:\/\/www.carparts.com\/blog\/author\/richardmccuistian\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Richard McCuistian, ASE Certified Master Automobile Technician\">Richard McCuistian, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<p>To learn more about firing order, read our explanation <a href=\"https:\/\/www.carparts.com\/blog\/error-code-p0301-cylinder-1-misfire-detected\/#Cylinder_Number_1_Location_and_Firing_Order\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>.<\/p>\n\n\n\n<p>For an in-depth discussion of how the engine computer knows which cylinder is misfiring, you can read more <a href=\"https:\/\/www.carparts.com\/blog\/p0300-code-random-or-multiple-cylinder-misfire-detected\/#An_In-Depth_Look_at_Cylinder_Misfires\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0303 Code?<\/h2>\n\n\n\n<p>A multitude of possible causes can set a misfire resulting in a stored P0303 trouble code. You can learn more about how misfires happen <a href=\"https:\/\/www.carparts.com\/blog\/error-code-p0301-cylinder-1-misfire-detected\/#How_a_Misfire_Happens\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>. Here&rsquo;s a list of possible causes for the P0303 code:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Ignition system problems, such as:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>A faulty worn spark plug<\/li><li>A failed coil pack or coil-on-plug coil<\/li><li>A bad <a href=\"https:\/\/www.carparts.com\/spark-plug-wire\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"spark plug wire\">spark plug wire<\/a> on a vehicle that has plug wires<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Fuel delivery issues, such as:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>A faulty fuel injector<\/li><li>Wiring issues with the fuel injector circuit (e.g., loose connections, damaged wires)<\/li><li>Problems with the powertrain control module, such as a damaged injector driver<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Engine mechanical problems, such as:<\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>A leaking valve<\/li><li>A worn <a href=\"https:\/\/www.carparts.com\/piston-ring-set\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"piston ring\">piston ring<\/a>, a damaged piston or damaged cylinder walls<\/li><li>A worn camshaft lobe or <a href=\"https:\/\/www.carparts.com\/blog\/bad-lifter-symptoms-noise-replacement-cost-and-more\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"damaged lifter\">damaged lifter<\/a><\/li><li>A leaking <a href=\"https:\/\/www.carparts.com\/head-gasket-set\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"head gasket\">head gasket<\/a><\/li><\/ul>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug-1024x683.jpg\" alt=\"worn out spark plug\" class=\"wp-image-39735\" width=\"1024\" height=\"683\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/06\/worn-out-spark-plug.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption>A broken spark plug can trigger the code P0303.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0303 Code?<\/h2>\n\n\n\n<p>There are several P303 engine misfire symptoms to look out for. Below are some of them:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check Engine light is illuminated\">Check Engine light is illuminated<\/a> or blinking<\/li><li>Vehicle jerks or hesitates during acceleration<\/li><li>Reduced performance exhibited through rough idling, stalling, reduced fuel economy, and loss of power<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0303 Code<\/h2>\n\n\n\n<p>Most <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"OBD-II\">OBD-II<\/a> codes have many possible causes. Because of this, diagnosing the exact cause will be a challenge. For the engine code P0303, there are several online resources that can help you accurately assess the situation.<\/p>\n\n\n\n<p>We recommend that you check out the video below for some helpful information to help you troubleshoot the P0303 code.<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Misfire Quick Tests (Is it a spark, fuel or compression problem?)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/uB9XCDO8oa8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the P0303 Code<\/h2>\n\n\n\n<p>With the wide variety of possible causes for the error code P0303, there isn&rsquo;t one surefire way to fix it. There are a few different repair options, and how you address the code will depend on the exact cause.<\/p>\n\n\n\n<p>That&rsquo;s why the key to effectively fixing the P0303 code is to diagnose it properly and pinpoint the exact cause.<\/p>\n\n\n\n<p>Before proceeding with diagnosing or fixing any trouble codes, remember to <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"consult your owner&rsquo;s manual or service manual\">consult your owner&rsquo;s manual or service manual<\/a> for more information on how to go about certain repairs.<\/p>\n\n\n\n<p>Chilton repair manuals are useful but getting an ALLDATA subscription has even more benefits for DIYers like you. A single-vehicle subscription from ALLDATA comes in handy because it provides you with the detailed factory repair information that you need.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Replacement Auto Parts for Your Vehicle<\/h2>\n\n\n\n<p>Once you&rsquo;ve determined what triggered the the P0303 code, don&rsquo;t put off addressing it. If you need to replace a part, be it a faulty <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injector\">fuel injector<\/a> or a bad <a href=\"https:\/\/www.carparts.com\/spark-plug\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"spark plug\">spark plug<\/a>, make sure to a choose high-quality replacement. The best way to ensure that is to shop at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>.<\/p>\n\n\n\n<p>All our replacement parts passed the highest quality control standards from industry professionals. That means you can count on them to perform like your stock part and last a long time.<\/p>\n\n\n\n<p>We make purchasing car parts online easier by providing accurate and detailed fitment information, making for a straightforward and hassle-free shopping experience. Use our vehicle selector to narrow down the catalog to the parts that fit your ride. Then, adjust the filters to view the products that match your preferred brand, price, and features.<\/p>\n\n\n\n<p>Expect fast and reliable shipping when you order from CarParts.com. After all, all our parts are on hand and ready to ship from a warehouse near you.<\/p>\n\n\n\n<p>Order the replacement auto parts you need to clear this trouble code today!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<br><\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/spark-plug\" target=\"_blank\" aria-label=\"spark plug\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/ng2164_1\">\n<strong>Spark Plug<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/ignition-coil\" target=\"_blank\" aria-label=\"ignition coil\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repi504604_1\">\n<strong>Ignition Coil<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/spark-plug-wire\" target=\"_blank\" aria-label=\"spark plug wire\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/reps504801_1\">\n<strong>Spark Plug Wire<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/distributor-cap\" target=\"_blank\" aria-label=\"distributor cap\" rel=\"noopener\">\n<img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/d_noimage.jpg,h_200,w_200,c_pad,f_auto,q_auto,dpr_auto,e_sharpen\/images\/repn314106_1\">\n<strong>Distributor Cap<\/strong>\n<\/a>\n\n<!-- end of editable content -->\n\n<\/div>\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>A misfire occurs when there is an insufficient amount of fuel burning in a cylinder. Since the way the engine&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0303-code-cylinder-3-misfire-detected\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":4,"featured_media":9523,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[1314],"tags":[3354],"ppma_author":[2607,2985],"class_list":{"0":"post-9520","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-car-engine-all-articles","9":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0303 Code: Cylinder 3 Misfire Detected - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Find out in this article what a P0303 code means, its common causes, and the associated symptoms with this OBD-II trouble code. Read on!\" \/>\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.carparts.com\/blog\/p0303-code-cylinder-3-misfire-detected\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P0303 Code: Cylinder 3 Misfire Detected - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"Find out in this article what a P0303 code means, its common causes, and the associated symptoms with this OBD-II trouble code. 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