{"id":85948,"date":"2023-06-22T19:32:10","date_gmt":"2023-06-23T02:32:10","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=85948"},"modified":"2025-08-26T19:24:24","modified_gmt":"2025-08-27T02:24:24","slug":"why-is-my-catalytic-converter-rattling-3-reasons","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/why-is-my-catalytic-converter-rattling-3-reasons\/","title":{"rendered":"Why Is My Catalytic Converter Rattling? 3 Reasons"},"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-column85948_fe2845-4b > .kt-inside-inner-col,.kadence-column85948_fe2845-4b > .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-column85948_fe2845-4b > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column85948_fe2845-4b > .kt-inside-inner-col{flex-direction:column;}.kadence-column85948_fe2845-4b > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column85948_fe2845-4b > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column85948_fe2845-4b{position:relative;}@media all and (max-width: 1024px){.kadence-column85948_fe2845-4b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column85948_fe2845-4b > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column85948_fe2845-4b inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-50e6bc  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-0d221e\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading85948_f44a19-31, .wp-block-kadence-advancedheading.kt-adv-heading85948_f44a19-31[data-kb-block=\"kb-adv-heading85948_f44a19-31\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading85948_f44a19-31 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading85948_f44a19-31[data-kb-block=\"kb-adv-heading85948_f44a19-31\"] 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-heading85948_f44a19-31 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading85948_f44a19-31[data-kb-block=\"kb-adv-heading85948_f44a19-31\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading85948_f44a19-31 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading85948_f44a19-31\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Regular wear and tear, broken honeycombs, and a loose heat shield can cause the catalytic converter to rattle.<\/li>\n\n\n\n<li>Driving with a faulty catalytic converter can lead to a failed emissions test.<\/li>\n\n\n\n<li>Faulty catalytic converters are intended to be replaced, not repaired.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>At some point, you might have asked yourself: &ldquo;Is the catalytic converter supposed to rattle?&rdquo;<\/p>\n\n\n\n<p>The answer is no.<\/p>\n\n\n\n<p>Normally, rattling <a href=\"https:\/\/www.carparts.com\/catalytic-converter\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"catalytic converters\">catalytic converters<\/a> are caused by loose heat shields. If this happens, a simple fix would be to deal with the heat shield. However, if the rattling comes from the catalytic converter itself, it might be a sign to get it replaced.<\/p>\n\n\n\n<p>Still, it&rsquo;s important to fix the root cause of the problem first to prevent the replacement catalytic converter from suffering the same fate. Keep an eye out for the different problems that could cause rattling in your catalytic converter:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Weathering from age and overuse<\/li>\n\n\n\n<li>Damage in the honeycombs<\/li>\n\n\n\n<li>Heat shield has come loose<\/li>\n\n\n\n<li>Clogging caused by the buildup of oil and dirt<\/li>\n<\/ul>\n\n\n\n<p>Some have quick fixes, while others require a catalytic converter replacement to resolve.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">3 Reasons Why the Catalytic Converter Is Rattling<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-1024x681.jpg\" alt=\"catalytic converter starting to rattle\" class=\"wp-image-85950\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-1024x681.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-768x511.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-1536x1022.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/catalytic-converter-starting-to-rattle.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">If you&rsquo;re wondering whether or not it&rsquo;s safe to drive with a rattling catalytic converter, it&rsquo;s important to consider the risks a rattling converter entails.<\/figcaption><\/figure>\n\n\n\n<p>If you&rsquo;re wondering whether or not it&rsquo;s safe to drive with a rattling catalytic converter, it&rsquo;s important to consider the risks a rattling converter entails. To do so, you&rsquo;ll need to learn what causes catalytic converters to rattle in the first place.<\/p>\n\n\n\n<p>Here&rsquo;s a list of the different problems that could cause rattling noises from your vehicle&rsquo;s catalytic converter:<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Weathering From Age and Faulty Engines<\/h3>\n\n\n\n<p>Catalytic converters will inevitably weather the more you drive your vehicle, causing it to rattle. On average, a catalytic converter lasts up to 10 years.<\/p>\n\n\n\n<p>Despite their long service life, many catalytic converters fail prematurely in rough driving conditions. For example, <strong>a faulty engine could cause a catalytic converter to degrade faster than normal<\/strong>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Simple Fix:<\/h4>\n\n\n\n<p>If your catalytic converter is too <a href=\"https:\/\/www.carparts.com\/blog\/bad-catalytic-converter-symptoms\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"old and weathered to work\">old and weathered to work<\/a>, it might be best to have it replaced. Forcing an old device to work could do more harm than good.<\/p>\n\n\n\n<p>A <a href=\"https:\/\/www.carparts.com\/blog\/best-catalytic-converters\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"total replacement\">total replacement<\/a> is safer than repairing something that&rsquo;s on its last legs.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Broken Honeycombs<\/h3>\n\n\n\n<p>Broken honeycomb structures in the catalytic converter can cause it to rattle. These honeycombs serve as catalyst supports, catalyzing the burning of any leftover unburned fuel that comes from the exhaust. They minimize the overall emission of toxic gases from your vehicle.<\/p>\n\n\n\n<p><strong>If these honeycombs break, your engine (if not your entire vehicle) will be at risk of taking significant and expensive damage.<\/strong> It&rsquo;s also worth mentioning that broken honeycombs can plug your exhaust and prevent the crank from starting. Because of this, it&rsquo;s important to fix broken honeycombs as soon as possible.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Simple Fix:<\/h4>\n\n\n\n<p>Your best bet when it comes to dealing with a broken honeycomb structure is to get your catalytic converter replaced.<\/p>\n\n\n\n<p>Damaged honeycomb structures tend to crack and fragment. On occasion, the heat can cause these fragments to fuse with other parts of the honeycomb.<\/p>\n\n\n\n<p>Replacing the converter guarantees you won&rsquo;t have to worry about clogged honeycombs.<\/p>\n\n\n\n<div class=\"rsi-card\">\n  <div class=\"rsi-thumb\">\n    <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/d_noimage.jpg\/b_white\/e_sharpen,e_auto_brightness,e_auto_contrast\/f_auto\/q_auto:eco,dpr_auto\/w_873,h_873,c_pad\/images\/repg960301_2\">\n  <\/div>\n  <div class=\"rsi-info\">\n    <span class=\"rsi-title\">Recommended Catalytic Converters<\/span>\n    <span class=\"rsi-desc\">Find out which brands of catalytic converters are the best on the market. Weigh pros and cons, check for compatibility and emission standards, then select a catalytic converter that works best for you.<\/span>\n    <a href=\"https:\/\/www.carparts.com\/blog\/recommended-catalytic-converters\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Discover Your Options\">Discover Your Options<\/a>\n  <\/div>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">Heat Shield Is Loose<\/h3>\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/catalyst-heat-shield\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"heat shield\">heat shield<\/a> of the catalytic converter might be loose if you can hear rattling noises when you drive. <strong>This happens when the bolts have either been damaged by corrosion or come loose through overuse<\/strong>.<\/p>\n\n\n\n<p>It&rsquo;s dangerous to drive a vehicle with a loose heat shield because it helps prevent internal components from overheating. Simultaneously, heat shields protect things around the catalytic converter, shielding everything around the exhaust. Neglecting a loose heat shield puts your catalytic converter at risk of overheating.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Simple Fix:<\/h4>\n\n\n\n<p>If the heat shield of your catalytic converter is ever knocked loose, you must secure it immediately. Tighten the bolts or replace the heat shield. The heat shield can also be tack welded back in place if total replacement seems too drastic.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Clogging Caused by Contaminants<\/h3>\n\n\n\n<p>Lastly, if you hear any rattling noises coming from your catalytic converter, there&rsquo;s a good chance it&rsquo;s simply <a href=\"https:\/\/www.carparts.com\/blog\/how-to-tell-if-the-catalytic-converter-is-clogged\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"clogged\">clogged<\/a>. <strong>Oil, dirt, and other contaminants can get inside your catalytic converter while you drive, and they can build up over time.<\/strong><\/p>\n\n\n\n<p>It&rsquo;s almost impossible to prevent blockage because gunk buildup is an inevitable part of every vehicle. Still, as prevalent as this problem is, don&rsquo;t put off resolving it. After all, clogged catalytic converters can make your engine stall and struggle to accelerate, or even fail to start outright.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Simple Fix:<\/h4>\n\n\n\n<p>Fortunately, dealing with a clogged catalytic converter is relatively simple. While the simplest fix would be to replace the catalytic converter entirely, it&rsquo;s worth trying to salvage your original first. Since catalytic converters cannot be unclogged with cleaning solutions, your best bet would be to try and find what&rsquo;s clogging it and remove it.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Since catalytic converters cannot be unclogged with cleaning solutions, your best bet would be to try and find what&rsquo;s clogging it and remove it.<\/p>\n<cite><em>&ndash;<\/em><a href=\"https:\/\/www.carparts.com\/blog\/author\/anthonyharlin\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Anthony Harlin, ASE Certified Master Automobile Technician\">Anthony Harlin, ASE Certified Master Automobile Technician<\/a><\/cite><\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\">Is It Bad to Drive With a Rattling Catalytic Converter?<\/h2>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-1024x682.jpg\" alt=\"car with increased harmful emissions\" class=\"wp-image-85949\" style=\"width:1024px;height:682px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-1200x800.jpg 1200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-with-increased-harmful-emissions.jpg 2000w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">Driving with a rattling or damaged catalytic converter isn&rsquo;t too dangerous. However, it increases your vehicle&rsquo;s harmful emissions, which in turn means you&rsquo;ll be exposed to more pollutants.<\/figcaption><\/figure>\n\n\n\n<p>Driving with a rattling or damaged catalytic converter isn&rsquo;t too dangerous. However, it increases your vehicle&rsquo;s harmful emissions, which in turn means you&rsquo;ll be exposed to more pollutants.<\/p>\n\n\n\n<p>The odds of a damaged converter getting you into a car accident are quite low because it won&rsquo;t affect how you drive in the same way that a vehicle&rsquo;s brake system or engine does.<\/p>\n\n\n\n<p>Bear in mind that this doesn&rsquo;t mean you should drive with a rattling catalytic converter. <strong>Faulty catalytic converters can still cause damage to the engine, and the odds of your vehicle failing emissions tests will increase drastically.<\/strong><\/p>\n\n\n\n<p>Because of this, you should get your catalytic converter repaired or replaced as soon as it shows signs of age or damage.<\/p>\n\n\n\n<!-- Error, Advert is not available at this time due to schedule\/geolocation restrictions! -->\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>At some point, you might have asked yourself: &ldquo;Is the catalytic converter supposed to rattle?&rdquo; The answer is no. Normally,&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/why-is-my-catalytic-converter-rattling-3-reasons\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":85951,"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":[52,3750],"tags":[3819,1189],"ppma_author":[2607,3742],"class_list":{"0":"post-85948","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-diy","8":"category-exhaust-system","9":"tag-catalyst-heat-shield","10":"tag-catalytic-converter-2","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why Is My Catalytic Converter Rattling? 3 Reasons - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"If your catalytic converter is rattling and you don\u2019t know why, read on to learn about some of the potential causes and how to fix them!\" \/>\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\/why-is-my-catalytic-converter-rattling-3-reasons\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why Is My Catalytic Converter Rattling? 3 Reasons - In The Garage with CarParts.com\" \/>\n<meta property=\"og:description\" content=\"If your catalytic converter is rattling and you don\u2019t know why, read on to learn about some of the potential causes and how to fix them!\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/why-is-my-catalytic-converter-rattling-3-reasons\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2023-06-23T02:32:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-27T02:24:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2023\/06\/car-catalytic-converter-showing-signs-of-rattling.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2000\" \/>\n\t<meta property=\"og:image:height\" content=\"1331\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"CarParts.com Research Team, Anthony Harlin, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@https:\/\/twitter.com\/CarPartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"CarParts.com Research Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/why-is-my-catalytic-converter-rattling-3-reasons\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/why-is-my-catalytic-converter-rattling-3-reasons\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1651\",\"name\":\"CarParts.com Research Team\",\"jobTitle\":\"Expert Automotive Writer\",\"description\":\"The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. 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