{"id":517958,"date":"2025-12-10T11:50:52","date_gmt":"2025-12-10T16:50:52","guid":{"rendered":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/"},"modified":"2025-12-10T11:50:52","modified_gmt":"2025-12-10T16:50:52","slug":"dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean","status":"publish","type":"post","link":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/","title":{"rendered":"P1151 Code Symptoms, Causes, Diagnosis &#038; Repair Guide"},"content":{"rendered":"<div class=\"container\">\n<section class=\"hero\">\n<div class=\"code-badge\">P1151<\/div>\n<h1>P1151 Code Symptoms, Causes, Diagnosis &amp; Repair Guide<\/h1>\n<p class=\"hero-subtitle\">\n<\/section>\n<div class=\"quick-summary\">\n<h2>Quick Summary<\/h2>\n<ul>\n<li>P1151 = \u201cLack of HO2S21 Switch \u2013 Sensor Indicates Lean.\u201d <\/li>\n<li>Check\u2011engine light comes on; drivers may see reduced fuel economy or hesitation as the ECU trims fuel. <\/li>\n<li>Primary causes are wiring faults, ECM\/PCM communication loss, or internal module failure. <\/li>\n<li>Diagnosis starts with a live scan, voltage checks on the HO2S21 circuit, and a module communication test. <\/li>\n<li>Replacement of the ECM\/PCM is often the most reliable fix; Flagship One supplies VIN\u2011matched, pre\u2011programmed units. <\/li>\n<\/ul>\n<\/div>\n<h3>P1151 Code: Symptoms, Causes, and How to Repair the Issue <\/h3>\n<p>When the P1151 code appears, the check\u2011engine lamp flashes on the dash and the engine control module (ECM) reports a lean condition from the HO2S21 oxygen\u2011sensor circuit. Drivers typically notice a dip in fuel efficiency\u2014often 2\u20114 mpg lower than normal\u2014or a momentary hesitation when the throttle is opened. The ECU compensates by pulling back fuel, which can feel like a \u201csoft\u201d acceleration. In some cases the vehicle may run a few miles before the light resets, but the code will reappear on the next drive cycle.<\/p>\n<h2>Symptoms <\/h2>\n<ul>\n<li>Check\u2011engine light illuminated (steady or flashing). <\/li>\n<li>Fuel\u2011economy drop of roughly 5\u201110 % compared with baseline. <\/li>\n<li>Brief hesitation or \u201cflat\u2011spot\u201d during initial throttle application. <\/li>\n<li>No obvious engine\u2011performance problems such as misfires, rough idle, or stalling. <\/li>\n<\/ul>\n<p>These signs are consistent with the ECM detecting a lean signal from the HO2S21 sensor circuit and reacting by reducing fuel delivery.<\/p>\n<h2>Why P1151 Problems Occur <\/h2>\n<h3>Faulty HO2S21 Wiring or Connector <\/h3>\n<p>Corrosion, broken pins, or a loose connector can interrupt the voltage signal from the HO2S21 sensor to the ECM. When the module receives an open\u2011circuit reading, it interprets the condition as a lack of sensor input and logs P1151.<\/p>\n<h3>ECM\/PCM Communication Failure <\/h3>\n<p>The ECM processes sensor data through internal analog\u2011to\u2011digital converters. A failure in the module\u2019s input stage, a damaged microcontroller pin, or software corruption can prevent the HO2S21 signal from being recognized, even if the sensor and wiring are intact.<\/p>\n<h3>Internal Sensor\u2011Circuit Damage Within the Module <\/h3>\n<p>Manufacturing defects, water intrusion, or age\u2011related PCB degradation can cause the HO2S21 input channel to short or open internally. The ECM then reports a missing sensor, triggering P1151.<\/p>\n<h3>Incorrect Calibration or Software Version <\/h3>\n<p>After a major software update, the ECM may expect a different sensor type or voltage range. If the installed sensor does not match the calibrated parameters, the module flags a lean condition and stores P1151.<\/p>\n<h2>Diagnostic and Repair Procedures <\/h2>\n<ol>\n<li><strong>Retrieve Freeze\u2011Frame Data<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Use a professional scan tool to read the P1151 code and capture the associated fuel\u2011trim values. A long\u2011term fuel trim (LTFT) consistently negative (\u201110 % to \u201120 %) confirms a lean condition.<\/p>\n<ol>\n<li><strong>Perform a Live Data Scan of HO2S21 Voltage<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; With the engine at idle, monitor the sensor voltage. A healthy sensor swings between ~0.1 V (lean) and ~0.9 V (rich) each cycle. A steady 0 V or 5 V indicates an open or short circuit.<\/p>\n<ol>\n<li><strong>Inspect Wiring Harness and Connectors<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Visually check for frayed wires, corrosion, or damaged pins in the HO2S21 circuit. Use a multimeter to verify continuity and resistance (should be &lt; 1 \u03a9). Repair any faults before proceeding.<\/p>\n<ol>\n<li><strong>Test ECM Communication<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; Run a module communication test from the scan tool. If the ECM fails to respond or reports \u201cno data\u201d for the HO2S21 channel, the fault likely resides inside the module.<\/p>\n<ol>\n<li><strong>Module Reprogramming<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; If the hardware checks out, reflash the ECM with the latest manufacturer calibration. Many cases of P1151 are resolved after updating the sensor map to match the installed HO2S21 type.<\/p>\n<ol>\n<li><strong>Module Repair or Replacement<\/strong>\n<\/li>\n<\/ol>\n<p> &#8211; When the ECM fails the communication test or shows internal voltage anomalies, a repair (e.g., board re\u2011soldering) may be attempted, but reliability is limited. Replacement of the ECM\/PCM is typically the definitive solution.<\/p>\n<p><strong>Cost Estimates<\/strong> <\/p>\n<ul>\n<li>Live scan and wiring inspection: $80\u2011$120 labor. <\/li>\n<li>ECM reprogramming: $150\u2011$250 (software license included). <\/li>\n<li>Module repair (if available): $200\u2011$400 plus labor. <\/li>\n<li>ECM\/PCM replacement: $600\u2011$900 for the unit, $200\u2011$300 labor. <\/li>\n<\/ul>\n<p>All labor rates assume a qualified technician with access to manufacturer\u2011level diagnostics.<\/p>\n<h2>When Replacement Makes More Sense Than Repair <\/h2>\n<div class=\"flagship-logo-section\">\n<a href=\"https:\/\/www.fs1inc.com\/\" rel=\"noopener noreferrer\" target=\"_blank\"><br \/>\n<img decoding=\"async\" alt=\"Flagship One\" class=\"flagship-logo\" src=\"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg\"\/><br \/>\n<\/a>\n<\/div>\n<p>Modern control modules are complex, integrating engine management, emissions control, and vehicle security functions. A replacement is not merely a hardware swap; it must be precisely programmed to match the vehicle\u2019s VIN, immobilizer keys, and emission certification. <\/p>\n<p>Flagship One specializes in VIN\u2011matched control modules, providing a plug\u2011and\u2011drive solution backed by a comprehensive warranty. Their units arrive pre\u2011programmed to the exact software version required for your vehicle, eliminating the need for on\u2011site calibration. When an ECM\u2019s internal sensor\u2011circuit has failed, a Flagship One replacement ensures long\u2011term reliability and compliance with emissions regulations. <\/p>\n<h2>Preventive Maintenance <\/h2>\n<ul>\n<li><strong>Keep Sensor Wiring Clean and Dry<\/strong> \u2013 Regularly inspect the HO2S21 harness for signs of moisture or corrosion, especially in high\u2011humidity climates. <\/li>\n<li><strong>Use OEM\u2011Quality Connectors<\/strong> \u2013 When repairing wiring, replace any damaged pins with OEM\u2011spec connectors to maintain proper shielding. <\/li>\n<li><strong>Schedule Periodic ECM Calibration Checks<\/strong> \u2013 During routine service, have the technician verify that the ECM software is current and that all sensor calibrations match factory specifications. <\/li>\n<li><strong>Address Check\u2011Engine Light Promptly<\/strong> \u2013 Early scanning prevents prolonged lean operation, which can increase exhaust\u2011system temperature and accelerate catalyst wear.<\/li>\n<\/ul>\n<div class=\"info-section\">\n<p><strong>Service Recommendation:<\/strong> Most issues related to this fault are diagnosed and corrected through inspection, wiring repair, and calibration rather than module replacement. For modules not typically replaced through aftermarket suppliers, diagnosis and repair should be performed by a certified automotive technician with access to factory service information and tooling.<\/p>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Lean\u2011running engine and check\u2011engine light on your vehicle? A missing HO2S21 sensor signals lean mix\u2014diagnose the sensor circuit now to prevent damage.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-517958","post","type-post","status-publish","format-standard","hentry","category-auto-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P1151 Code Symptoms, Causes, Diagnosis &amp; Repair Guide - Flagship One Blog<\/title>\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.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"P1151 Code Symptoms, Causes, Diagnosis &amp; Repair Guide - Flagship One Blog\" \/>\n<meta property=\"og:description\" content=\"Lean\u2011running engine and check\u2011engine light on your vehicle? A missing HO2S21 sensor signals lean mix\u2014diagnose the sensor circuit now to prevent damage.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/\" \/>\n<meta property=\"og:site_name\" content=\"Flagship One Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/flagshipone\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/flagshipone\/\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-10T16:50:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg\" \/>\n<meta name=\"author\" content=\"FlagshipOne\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:site\" content=\"@theflagshipone\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"FlagshipOne\" \/>\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.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/\"},\"author\":{\"name\":\"FlagshipOne\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\"},\"headline\":\"P1151 Code Symptoms, Causes, Diagnosis &#038; Repair Guide\",\"datePublished\":\"2025-12-10T16:50:52+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/\"},\"wordCount\":943,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"articleSection\":[\"Auto News\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/\",\"name\":\"P1151 Code Symptoms, Causes, Diagnosis & Repair Guide - Flagship One Blog\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"datePublished\":\"2025-12-10T16:50:52+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#primaryimage\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"contentUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/12\\\/fs1inc_logo2-scaled.jpg\",\"width\":2560,\"height\":617},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"P1151 Code Symptoms, Causes, Diagnosis &#038; Repair Guide\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"name\":\"Flagship One Blog\",\"description\":\"Flagship One Inc. OEM Engine Computers  Control Modules\",\"publisher\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#organization\",\"name\":\"Flagship One, Inc.\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"contentUrl\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/web-lg-fs1-logo.png\",\"width\":1341,\"height\":1098,\"caption\":\"Flagship One, Inc.\"},\"image\":{\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/logo\\\/image\\\/\"},\"sameAs\":[\"https:\\\/\\\/www.facebook.com\\\/flagshipone\",\"https:\\\/\\\/x.com\\\/theflagshipone\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\",\"https:\\\/\\\/www.youtube.com\\\/channel\\\/UC0oyKphffBM2qkJ-gKPmMXw\"]},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/#\\\/schema\\\/person\\\/a3cf463514bd03eb7656953ef8f75700\",\"name\":\"FlagshipOne\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g\",\"caption\":\"FlagshipOne\"},\"description\":\"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.\",\"sameAs\":[\"https:\\\/\\\/www.fs1inc.com\\\/\",\"https:\\\/\\\/www.facebook.com\\\/flagshipone\\\/\",\"https:\\\/\\\/www.instagram.com\\\/flagship_one\\\/\",\"https:\\\/\\\/www.linkedin.com\\\/company\\\/fs1inc\"],\"url\":\"https:\\\/\\\/www.fs1inc.com\\\/blog\\\/author\\\/flagship1inc\\\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"P1151 Code Symptoms, Causes, Diagnosis & Repair Guide - Flagship One Blog","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/","og_locale":"en_US","og_type":"article","og_title":"P1151 Code Symptoms, Causes, Diagnosis & Repair Guide - Flagship One Blog","og_description":"Lean\u2011running engine and check\u2011engine light on your vehicle? A missing HO2S21 sensor signals lean mix\u2014diagnose the sensor circuit now to prevent damage.","og_url":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/","og_site_name":"Flagship One Blog","article_publisher":"https:\/\/www.facebook.com\/flagshipone","article_author":"https:\/\/www.facebook.com\/flagshipone\/","article_published_time":"2025-12-10T16:50:52+00:00","og_image":[{"url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","type":"","width":"","height":""}],"author":"FlagshipOne","twitter_card":"summary_large_image","twitter_creator":"@theflagshipone","twitter_site":"@theflagshipone","twitter_misc":{"Written by":"FlagshipOne","Est. reading time":"5 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#article","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/"},"author":{"name":"FlagshipOne","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700"},"headline":"P1151 Code Symptoms, Causes, Diagnosis &#038; Repair Guide","datePublished":"2025-12-10T16:50:52+00:00","mainEntityOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/"},"wordCount":943,"commentCount":0,"publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#primaryimage"},"thumbnailUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","articleSection":["Auto News"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#respond"]}]},{"@type":"WebPage","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/","url":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/","name":"P1151 Code Symptoms, Causes, Diagnosis & Repair Guide - Flagship One Blog","isPartOf":{"@id":"https:\/\/www.fs1inc.com\/blog\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#primaryimage"},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#primaryimage"},"thumbnailUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","datePublished":"2025-12-10T16:50:52+00:00","breadcrumb":{"@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/"]}]},{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#primaryimage","url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","contentUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2025\/12\/fs1inc_logo2-scaled.jpg","width":2560,"height":617},{"@type":"BreadcrumbList","@id":"https:\/\/www.fs1inc.com\/blog\/dtc-p1151-lack-ho2s21-switch-sensor-indicates-lean\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/www.fs1inc.com\/blog\/"},{"@type":"ListItem","position":2,"name":"P1151 Code Symptoms, Causes, Diagnosis &#038; Repair Guide"}]},{"@type":"WebSite","@id":"https:\/\/www.fs1inc.com\/blog\/#website","url":"https:\/\/www.fs1inc.com\/blog\/","name":"Flagship One Blog","description":"Flagship One Inc. OEM Engine Computers  Control Modules","publisher":{"@id":"https:\/\/www.fs1inc.com\/blog\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/www.fs1inc.com\/blog\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"},{"@type":"Organization","@id":"https:\/\/www.fs1inc.com\/blog\/#organization","name":"Flagship One, Inc.","url":"https:\/\/www.fs1inc.com\/blog\/","logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/","url":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","contentUrl":"https:\/\/www.fs1inc.com\/blog\/wp-content\/uploads\/2019\/06\/web-lg-fs1-logo.png","width":1341,"height":1098,"caption":"Flagship One, Inc."},"image":{"@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/logo\/image\/"},"sameAs":["https:\/\/www.facebook.com\/flagshipone","https:\/\/x.com\/theflagshipone","https:\/\/www.instagram.com\/flagship_one","https:\/\/www.youtube.com\/channel\/UC0oyKphffBM2qkJ-gKPmMXw"]},{"@type":"Person","@id":"https:\/\/www.fs1inc.com\/blog\/#\/schema\/person\/a3cf463514bd03eb7656953ef8f75700","name":"FlagshipOne","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/351b81e51993825aea73280c48061a7205fdd2189730ebbdee5d63894c5cebb4?s=96&d=mm&r=g","caption":"FlagshipOne"},"description":"The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.","sameAs":["https:\/\/www.fs1inc.com\/","https:\/\/www.facebook.com\/flagshipone\/","https:\/\/www.instagram.com\/flagship_one\/","https:\/\/www.linkedin.com\/company\/fs1inc"],"url":"https:\/\/www.fs1inc.com\/blog\/author\/flagship1inc\/"}]}},"_links":{"self":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/517958","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/comments?post=517958"}],"version-history":[{"count":0,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/posts\/517958\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/media?parent=517958"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/categories?post=517958"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fs1inc.com\/blog\/wp-json\/wp\/v2\/tags?post=517958"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}