{"id":15625,"date":"2021-08-11T23:36:00","date_gmt":"2021-08-12T06:36:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=15625"},"modified":"2026-02-10T19:51:50","modified_gmt":"2026-02-11T03:51:50","slug":"p0030-ho2s-heater-control-circuit-bank-1-sensor-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0030-ho2s-heater-control-circuit-bank-1-sensor-1\/","title":{"rendered":"P0030: HO2S Heater Control Circuit (Bank 1, Sensor 1)"},"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-column15625_5870fd-15 > .kt-inside-inner-col{border-top-width:0px;border-right-width:0px;border-bottom-width:0px;border-left-width:0px;}.kadence-column15625_5870fd-15 > .kt-inside-inner-col,.kadence-column15625_5870fd-15 > .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-column15625_5870fd-15 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column15625_5870fd-15 > .kt-inside-inner-col{flex-direction:column;}.kadence-column15625_5870fd-15 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column15625_5870fd-15 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column15625_5870fd-15{position:relative;}@media all and (max-width: 1024px){.kadence-column15625_5870fd-15 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column15625_5870fd-15 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column15625_5870fd-15 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-6f6fde  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-746365\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading15625_7ae3c4-4d, .wp-block-kadence-advancedheading.kt-adv-heading15625_7ae3c4-4d[data-kb-block=\"kb-adv-heading15625_7ae3c4-4d\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading15625_7ae3c4-4d mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading15625_7ae3c4-4d[data-kb-block=\"kb-adv-heading15625_7ae3c4-4d\"] 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-heading15625_7ae3c4-4d img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading15625_7ae3c4-4d[data-kb-block=\"kb-adv-heading15625_7ae3c4-4d\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading15625_7ae3c4-4d summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading15625_7ae3c4-4d\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>DTC P0030 stands for &ldquo;HO2S Heater Control Circuit (Bank 1, Sensor 1).&rdquo;<\/li>\n\n\n\n<li>P0030 is typically triggered when your vehicle&rsquo;s control module detects problems in the heater circuit in oxygen sensor Bank 1, Sensor 1.<\/li>\n\n\n\n<li>You can tell when P0030 is in effect if the check engine light is lit and if your vehicle suffers from decreased fuel mileage.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>When one of your oxygen sensors or any of its related components go bad, a trouble code may be logged. Learn more about the OBD-II code P0030, one of the codes related to faults in the emission system.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"683\" height=\"1024\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-intake-683x1024.jpeg\" alt=\"oxygen sensor intake\" class=\"wp-image-15636\" style=\"width:683px;height:1024px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-intake-683x1024.jpeg 683w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-intake-200x300.jpeg 200w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-intake-768x1151.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-intake-150x225.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/oxygen-sensor-intake.jpeg 1001w\" sizes=\"(max-width: 683px) 100vw, 683px\"><figcaption class=\"wp-element-caption\">Code P0030 may be set by your PCM if there&rsquo;s a fault in the heater circuit in oxygen sensor Bank 1, Sensor 1.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What Does the P0030 Code Mean? <\/h2>\n\n\n\n<p>Diagnostic Trouble Code (DTC) P0030 stands for &ldquo;HO2S Heater Control Circuit (Bank 1, Sensor 1).&rdquo; It may be triggered when your vehicle&rsquo;s control module detects a fault in the heater circuit in oxygen sensor Bank 1, Sensor 1.<\/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>Bank 1 is where cylinder number 1 is located. On a Ford Pickup, Bank 1 is the passenger side bank, but on Chevy and Dodge pickups, Bank 1 is the driver side bank. Make sure you know bank 1 from bank 2 before you start trying to fix the issue. If there is only one bank (as on an inline 4 cylinder) there is no Bank 2.<\/p>\n\n\n\n<p>Bank 1 Sensor 1 is between the engine and the catalytic converter. Bank 2 has a sensor 1 and a sensor 2 laid out the same way.<\/p>\n\n\n\n<p>Oxygen sensors need to be heated to work. An O2 sensor won&rsquo;t work below a certain temperature &ndash; for conventional oxygen sensors, that magic number is 600&deg;F. You can learn more about how O2 sensors are heated and how an OBD code like P0030 can be logged as a result of this process <a href=\"https:\/\/www.carparts.com\/blog\/p0141-code-oxygen-sensor-heater-circuit-malfunction-bank-1-sensor-2\/#Why_Do_Oxygen_Sensors_Need_Heat\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"here\">here<\/a>.<\/p>\n\n\n\n<p><em><strong>Note:<\/strong> The definition of code P0030 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor-1024x683.jpeg\" alt=\"o2 sensor\" class=\"wp-image-15634\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor-1024x683.jpeg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor-300x200.jpeg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor-768x512.jpeg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor-600x400.jpeg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor-150x100.jpeg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2020\/09\/o2-sensor.jpeg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">An issue with the oxygen sensor heater circuit, such as a blown fuse, damaged wires or poor connections can cause code P0030.<\/figcaption><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0030 Code? <\/h2>\n\n\n\n<p>Here are some of the possible triggers of code P0030: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Faulty oxygen sensor <\/li>\n\n\n\n<li>An issue with the oxygen sensor heater circuit, such as a blown fuse, damaged wires or poor connections <\/li>\n\n\n\n<li>An issue with the PCM, such as software in need of an update <\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0030 Code? <\/h2>\n\n\n\n<p>Since the P0030 code is a generic <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"code\">code<\/a>, it is supported by most vehicles. However, symptoms for each make and model may vary. Here are some of the common symptoms related to the code: <\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Check engine light turns on\">Check engine light turns on<\/a><\/li>\n\n\n\n<li>Decreased fuel mileage (depending on fault)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0030 Code <\/h2>\n\n\n\n<p>The diagnostic and repair steps for code P0030 may vary depending on your vehicle&rsquo;s year, make, and model. For example, repair steps for a code P0030 in a Chevy may not work for a P0030 code in a Subaru. To help you get an idea of what the process might involve, here are videos you can watch: <\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-4-3 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Diagnose And Repair A P0030 and P0135 On A Chevy Cobalt\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/WUJF7nIlC_g?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<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=\"P0030 trouble code. Oxygen Sensor Bad heater circuit. (Better Version)\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/3SVzaekI0jU?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 P0030 Code<\/h2>\n\n\n\n<p>Once you&rsquo;ve determined the exact cause of the P0030 code, the next step to resolving it is finding the appropriate repair steps. Research confirmed fixes that are specific to your vehicle&rsquo;s year, make, and model. You may use <a href=\"https:\/\/www.carparts.com\/blog\/best-online-resources-to-help-you-learn-how-to-fix-cars\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"online auto repair resources and guides\">online auto repair resources and guides<\/a> as a reference.<\/p>\n\n\n\n<p>If you&rsquo;re not confident with your automotive know-how and DIY repair skills, it may be best to let a mechanic resolve this code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Get a Replacement Oxygen Sensor Without Leaving Your Home<\/h2>\n\n\n\n<p>It&rsquo;s highly advisable to stop driving your car or truck if one of its oxygen sensors develops a problem. Exhaust problems are costly to repair and can lead to equally expensive engine issues. But here&rsquo;s some good news&ndash;you can get an affordable replacement oxygen sensor at CarParts.com.<\/p>\n\n\n\n<p>Why pay dealership prices for an oxygen sensor if you can get the same quality at a lower price? At <a href=\"http:\/\/carparts.com\" target=\"_blank\" rel=\"noreferrer noopener nofollow\" aria-label=\"CarParts.com\">CarParts.com<\/a>, our competitively priced parts help you get your car back on the road while staying within your budget. Furthermore, our parts meet world-class standards because we exclusively source them from trusted veterans of the auto parts industry. We efficiently process your order and ship your new part from our nearest distribution center, so you can expect the oxygen sensor you ordered to arrive in only several business days.<\/p>\n\n\n\n<p>CarParts.com offers a wide selection of <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensors\">oxygen sensors<\/a> for vehicles of various years, makes, and models. Don&rsquo;t miss out on the best deals on O2 sensors and order what you need today!<\/p>\n\n\n\n<div class=\"shop-project\">\n\n    <h2>Shop this Project<\/h2>\n\n    <ul class=\"shop-project-list\">\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960915_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960915_1\" alt=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated\">DriveWire &ndash; Oxygen Sensor, 4-Wire, Heated<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$49.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/oxygen-sensor\/drivewire\/repn960915\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/repn960344\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960344_1\" alt=\"Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/repn960344_1\" alt=\"Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/repn960344\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine\">Evan Fischer&reg; &ndash; Rear Catalytic Converter, Federal EPA Standard, 46-State Legal, 2.5L Engine<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$154.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/catalytic-converter\/evan-fischer\/repn960344\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/engine-control-module\/dorman\/rb318022\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/images\/rb318022_1\" alt=\"Dorman&reg; &ndash; 318-022 OE Solutions Series Engine Control Module - Direct Fit, Sold individually\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/images\/rb318022_1\" alt=\"Dorman&reg; &ndash; 318-022 OE Solutions Series Engine Control Module - Direct Fit, Sold individually\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/engine-control-module\/dorman\/rb318022\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Dorman&reg; &ndash; 318-022 OE Solutions Series Engine Control Module &ndash; Direct Fit, Sold individually\">Dorman&reg; &ndash; 318-022 OE Solutions Series Engine Control Module &ndash; Direct Fit, Sold individually<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-5.svg\" alt=\"5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$321.40<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/engine-control-module\/dorman\/rb318022\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n            <\/ul>\n<\/div>\n\n\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>When one of your oxygen sensors or any of its related components go bad, a trouble code may be logged&#8230;. <a href=\"https:\/\/www.carparts.com\/blog\/p0030-ho2s-heater-control-circuit-bank-1-sensor-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":15637,"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":[1190],"ppma_author":[2607,2985],"class_list":{"0":"post-15625","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-oxygen-sensor-2","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>P0030: HO2S Heater Control Circuit (Bank 1, Sensor 1) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"Learn more about OBD-II code P0030, its possible causes, and common symptoms. 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