{"id":7720,"date":"2021-09-23T02:38:00","date_gmt":"2021-09-23T09:38:00","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=7720"},"modified":"2025-05-19T23:55:09","modified_gmt":"2025-05-20T06:55:09","slug":"p0171-code-system-too-lean-bank-1","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/p0171-code-system-too-lean-bank-1\/","title":{"rendered":"P0171 Code: System Too Lean (Bank 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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column7720_c6fb52-05 > .kt-inside-inner-col,.kadence-column7720_c6fb52-05 > .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-column7720_c6fb52-05 > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column7720_c6fb52-05 > .kt-inside-inner-col{flex-direction:column;}.kadence-column7720_c6fb52-05 > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column7720_c6fb52-05 > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column7720_c6fb52-05{position:relative;}@media all and (max-width: 1024px){.kadence-column7720_c6fb52-05 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column7720_c6fb52-05 > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column7720_c6fb52-05 inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-9a09a2  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-d24bda\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading7720_80dd54-20, .wp-block-kadence-advancedheading.kt-adv-heading7720_80dd54-20[data-kb-block=\"kb-adv-heading7720_80dd54-20\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading7720_80dd54-20 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading7720_80dd54-20[data-kb-block=\"kb-adv-heading7720_80dd54-20\"] 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-heading7720_80dd54-20 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading7720_80dd54-20[data-kb-block=\"kb-adv-heading7720_80dd54-20\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading7720_80dd54-20 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading7720_80dd54-20\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The P0171 code could either mean that the oxygen sensor detects too much oxygen or too little fuel in the air-to-fuel ratio.<\/li>\n\n\n\n<li>Some possible causes for the imbalance include vacuum leaks, malfunctioning mass air flow sensors, and a clogged fuel filter.<\/li>\n\n\n\n<li>Symptoms of the P0171 code include power loss, misfires, and rough idling.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>The <a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ECM\">ECM<\/a> has the power to adjust the amount of fuel injected if an increase in the amount of air being fed into the engine is detected. However, when the computer detects incorrect fuel and air ratio, it could trigger the P0171 code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does Code P0171 Mean?<\/h2>\n\n\n\n<p>When the ECM\/PCM is having to add too much fuel based on input from the <a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"O2 sensor\">O2 sensor<\/a>, the fault code P0171 will be sent to the ECM, which will trigger the check engine light to illuminate. This code could either mean that the oxygen sensor is detecting too much oxygen <em>or<\/em> too little fuel in the mixture.<\/p>\n\n\n\n<p>This lack of fuel is known as a lean mixture. In simpler terms, what the code P0171 means is that your system has too lean of a mixture and is not operating optimally.<\/p>\n\n\n\n<p>A vehicle running on a lean mixture causes more pollution because it emits oxides of nitrogen (NOx) that are harmful to the environment. Lean vehicles also have a tendency to misfire as hydrocarbons from unburnt fuel reach the catalytic converters.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"678\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-1024x678.jpg\" alt=\"check engine light on as a symptom of trouble code\" class=\"wp-image-44201\" style=\"width:1024px;height:678px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-1024x678.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-300x199.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-768x509.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-1536x1017.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-scaled.jpg 2048w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/check-engine-light-on-as-a-symptom-of-trouble-code-150x99.jpg 150w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">When the ECM\/PCM is having to add too much fuel based on input from the O2 sensor, the fault code P0171 will be sent to the ECM, which will trigger the check engine light to illuminate.<\/figcaption><\/figure>\n\n\n\n<p>This could cause a spike in the car&rsquo;s fuel consumption, as well as exhaust damage and <a href=\"https:\/\/www.carparts.com\/blog\/how-to-pass-an-emissions-test\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"emission test failure\">emission test failure<\/a>.<\/p>\n\n\n\n<p>If you wish to learn more about rich and lean OBD codes, you can read our discussion about <a href=\"https:\/\/www.carparts.com\/blog\/p0174-system-too-lean-cylinder-bank-2\/#More_About_P0174_and_Lean_Rich_Codes\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"air-fuel mixture\">air-fuel mixture<\/a>. To gain a technical understanding of how the air-fuel mixture can trigger codes to be stored in a vehicle, you can read our explanation about the <a href=\"https:\/\/www.carparts.com\/blog\/p0172-code-fuel-system-too-rich-bank-1\/#An_In-Depth_Look_at_Air-Fuel_Mixture_and_How_It_Could_Cause_an_OBD_Code_to_Be_Stored\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"ideal mixture and OBD codes\">ideal mixture and OBD codes<\/a>. Otherwise, continue reading the following section to quickly learn the possible causes of P0171.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Possible Causes of the P0171 Code?<\/h2>\n\n\n\n<p>Lean fuel mixture is a common issue among many vehicles, regardless of the model year. Passenger cars and trucks alike can be affected but it isn&rsquo;t always triggered by the same failing component.<\/p>\n\n\n\n<p>For example, a P0171 on your <a href=\"https:\/\/www.carparts.com\/chevrolet\/cruze\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Chevy Cruze\">Chevy Cruze<\/a> could be due to a failing PCV system, while the P0171 on your friend&rsquo;s <a href=\"https:\/\/www.carparts.com\/ford\/f-150\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Ford F-150\">Ford F-150<\/a> could be from a clogged fuel injector.<\/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>Poor fuel mixture is a serious problem that major manufacturers face. If you have a P0171 on your vehicle, for example, the best thing to do is to act as quickly as possible.<\/p>\n\n\n\n<p>The first step is finding out what&rsquo;s causing this OBD-II code. Here are some of the possible causes of a P0171 code:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Vacuum leak due to damaged <a href=\"https:\/\/www.carparts.com\/blog\/web-stories\/what-is-an-intake-manifold-gasket\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"intake manifold gasket\">intake manifold gasket<\/a>s or punctured vacuum and positive crankcase ventilation (PCV) hoses<\/li>\n\n\n\n<li>Malfunctioning <a href=\"https:\/\/www.carparts.com\/blog\/symptoms-of-failing-mass-air-flow-sensor\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"mass airflow (MAF) sensor\">mass airflow (MAF) sensor<\/a><\/li>\n\n\n\n<li>Clogged <a href=\"https:\/\/www.carparts.com\/blog\/the-top-4-signs-of-a-bad-fuel-filter\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel filter\">fuel filter<\/a><\/li>\n\n\n\n<li>Failing <a href=\"https:\/\/www.carparts.com\/blog\/common-fuel-pump-symptoms\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel pump\">fuel pump<\/a><\/li>\n\n\n\n<li>Clogged <a href=\"https:\/\/www.carparts.com\/blog\/the-top-6-signs-of-bad-fuel-injectors\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injectors\">fuel injectors<\/a><\/li>\n\n\n\n<li>Failing <a href=\"https:\/\/www.carparts.com\/blog\/the-top-5-symptoms-of-a-bad-fuel-pressure-regulator\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel pressure regulator\">fuel pressure regulator<\/a><\/li>\n\n\n\n<li>Worn-out <a href=\"https:\/\/www.carparts.com\/blog\/bad-o2-sensor-symptoms-causes-replacement-cost\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"oxygen sensor\">oxygen sensor<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Common Symptoms of the P0171 Code?<\/h2>\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\/2021\/09\/car-stalling-caused-by-trouble-code-1024x683.jpg\" alt=\"car stalling caused by trouble code\" class=\"wp-image-44202\" style=\"width:1024px;height:683px\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/car-stalling-caused-by-trouble-code-1024x683.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/car-stalling-caused-by-trouble-code-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/car-stalling-caused-by-trouble-code-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/car-stalling-caused-by-trouble-code-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/car-stalling-caused-by-trouble-code-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/09\/car-stalling-caused-by-trouble-code.jpg 1500w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A stalling engine is a common symptom of the P0171 Code.<\/figcaption><\/figure>\n\n\n\n<p>Here are the symptoms you need to be aware of that point to a lean mixture problem:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>No symptoms other than the Check Engine Light<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/check-engine-light-flashing\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Illuminated Check Engine Light\">Illuminated Check Engine Light<\/a><\/li>\n\n\n\n<li>Loss of power<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-misfire-plus-common-obd-codes-linked-to-a-misfiring-engine\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Misfiring\">Misfiring<\/a><\/li>\n\n\n\n<li>Rough idling<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/my-car-wont-start-what-should-i-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Difficulty when starting\">Difficulty when starting<\/a> the car<\/li>\n\n\n\n<li><a href=\"https:\/\/www.carparts.com\/blog\/car-shuts-off-while-driving-causes-what-to-do\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Engine stalling\">Engine stalling<\/a><\/li>\n<\/ul>\n\n\n\n    <div class=\"perspective-widget\">\n        <div class=\"pt-child-wrap\">\n\n            <div class=\"pt-col-item1\">\n                <figure class=\"aligncenter size-large\">\n                        <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/dpr_auto,f_auto,q_auto\/carparts\/blog\/plugins\/amp\/avatar-comments\" class=\"com-thumb\" alt=\"Avatar of CarParts.com Research Team\" width=\"100\" height=\"100\">\n                <\/figure>\n                <p>\n                    <strong>CarParts.com Research Team<\/strong> \n                    <span>User<\/span>\n                <\/p>\n            <\/div>\n\n            <div class=\"pt-col-item2\">\n                <div class=\"protip-desc\">\n                    <div class=\"perspective-help-tip\">   \n                        <p>There&rsquo;s more than one way to look at an issue. &ldquo;Community Perspectives&rdquo; highlight authentic personal viewpoints and real-life experiences by the CarParts.com community, including our readers, experts, and product specialists, among others. This can help you make better informed decisions about your car.<\/p>\n                    <\/div>\n                    <div class=\"perspective-help-caption tooltip\"> \n                        <h2>CarParts.com Community Perspectives<\/h2>\n                        <p>A triggered code without any symptoms is fairly common. Even though you don&rsquo;t notice any drivability problems, the PCM is detecting a lean condition. <\/p>\n                        <div class=\"cta-btn\">\n                            <a href=\"https:\/\/www.carparts.com\/blog\/p0171-code-system-too-lean-bank-1\/#commentform\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Jump to Discussions\">Jump to Discussions<\/a>\n                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n        <\/div>\n    <\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How to Diagnose the P0171 Code<\/h2>\n\n\n\n<p>Since there can be more than one faulty part in the system that&rsquo;s causing the P0171 trouble code, pinpointing the problem isn&rsquo;t as straightforward as you would think.<\/p>\n\n\n\n<p>OBD-II codes, in general, can sometimes indicate severe problems that may require the assistance of a licensed professional.<\/p>\n\n\n\n<p>For an idea of how to troubleshoot code P0171, check out the video below:<\/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=\"Causes of lean condition trouble codes P0171, P0174 - GM 5 3L\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/3RFTS22w6tM?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 P0171 Code<\/h2>\n\n\n\n<p>Fixing a P0171 code depends on which component is triggering the fault. You&rsquo;ll need to diagnose the code accurately, as outlined above, then perform any necessary repairs. The code could be triggered by anything from a bad sensor to an engine mechanical concern, so you must do your homework.<\/p>\n\n\n\n<p>Also, keep in mind that all vehicles are different. When troubleshooting and repairing <a href=\"https:\/\/www.carparts.com\/blog\/search-obd2-codes-list\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"diagnostic trouble codes\">diagnostic trouble codes<\/a>, you should <a href=\"https:\/\/www.carparts.com\/blog\/why-you-should-always-consult-a-repair-manual\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"consult the factory repair information\">consult the factory repair information<\/a> for your application. Repair manuals, such as those from Chilton, are useful, but an ALLDATA subscription is even better. ALLDATA has single-vehicle subscriptions for DIYers that provide detailed factory repair information.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Notes About the P0171 Trouble Code<\/h2>\n\n\n\n<p>A P0171 often triggers with at least the P0170 code, which notes that the PCM has detected an anomaly in the fuel trim. Another code that often triggers at the same time as the P0170 code is the P0172 code. The P0172 code indicates the opposite of the P0171 code, as it triggers when the PCM detects negative fuel trim and the engine runs too rich. The P0171 code and its related codes also make a distinction between air-fuel ratio problems in engine Bank 1 and Bank 2. Bank 1 holds the #1 cylinder, while Bank 2 holds the #2 cylinder.<\/p>\n\n\n\n<p>The location of the bank depends on the vehicle&rsquo;s make and model. Bank 2 will either be on the passenger or driver&rsquo;s side. The P0170 to P0175 codes will help you locate and identify the exact fuel trim issue occurring.<\/p>\n\n\n\n<p>While you can operate your vehicle if the P0171 or its related codes are flashing, we strongly recommend against it.<\/p>\n\n\n\n<p>Don&rsquo;t ignore a P0171 code&mdash;address it as soon as possible. A poorly running engine due to a lean fuel mixture can fail if left untreated. A small, inexpensive problem could worsen and make your vehicle undrivable.<\/p>\n\n\n\n<p>Instead of shrugging it off, remember that an OBD-II code P0171 is a serious issue that needs your attention. The consequences of ignoring this trouble code include reduced fuel economy, weak performance, poor ride quality&mdash;and even engine damage.<\/p>\n\n\n\n<p>Bring your vehicle to a trusted mechanic as soon as possible so they can fix any issues causing these codes.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Where to Get Replacement Parts to Clear the P0171 Code<\/h2>\n\n\n\n<p>You don&rsquo;t have to stress yourself out if your scan tool reads a P0171 code. If you need to replace parts, be it the <a href=\"https:\/\/www.carparts.com\/intake-manifold-gasket\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"intake manifold gasket\">intake manifold gasket<\/a> or the <a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"fuel injector\">fuel injector<\/a>, we have you covered here at CarParts.com.<\/p>\n\n\n\n<p>We have a wide selection of top-notch replacement parts to help you get back on the road in no time. Input your ride&rsquo;s year, make, and model into our vehicle selector to view compatible parts, then change the filters to the brand, price range, and specs you prefer. If you have any questions, contact us using our toll-free hotline, and our round-the-clock customer service team will assist you.<\/p>\n\n\n\n<p>Here at <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a>, our replacement parts all come with a low-price guarantee, so you won&rsquo;t have to spend much of your hard-earned savings just to get your ride back on the road. All our products have undergone strict quality control tests during manufacturing. On top of that, our team of industry experts handpicked our products to ensure we&rsquo;re giving you only the best options.<\/p>\n\n\n\n<p>Take a look at our selection now and order your replacement parts today!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Products Mentioned in this Guide<\/h2>\n\n\n\n<div class=\"reusable-productlink\">\n\n<!-- start of editable content -->\n\n<a href=\"https:\/\/www.carparts.com\/fuel-pump\" target=\"_blank\" aria-label=\"Fuel Pump\" 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\/repb314526_1\">\n<strong>Fuel Pump<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/oxygen-sensor\" target=\"_blank\" aria-label=\"Oxygen Sensor\" 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\/set-repb960901-2_1\">\n<strong>Oxygen Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/engine-control-module\" target=\"_blank\" aria-label=\"Engine Control Module\" 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\/a1721001_1\">\n<strong>Engine Control Module<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/mass-air-flow-sensor\" target=\"_blank\" aria-label=\"Mass Air Flow Sensor\" 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\/repb316709_1\">\n<strong>Mass Air Flow Sensor<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/fuel-pressure-regulator\" target=\"_blank\" aria-label=\"Fuel Pressure Regulator\" 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\/repc318103_1\">\n<strong>Fuel Pressure Regulator<\/strong>\n<\/a>\n\n<a href=\"https:\/\/www.carparts.com\/fuel-injector\" target=\"_blank\" aria-label=\"Fuel Injector\" 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\/repf314302_1\">\n<strong>Fuel Injector<\/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\"> 6<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>The ECM has the power to adjust the amount of fuel injected if an increase in the amount of air&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/p0171-code-system-too-lean-bank-1\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1651,"featured_media":7722,"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":[1323,1329,1861],"ppma_author":[2607,2985],"class_list":{"0":"post-7720","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-obd-ii-trouble-codes","8":"tag-engine-control-module-2","9":"tag-intake-manifold-gasket","10":"tag-maf-sensor","11":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>P0171 Code: System Too Lean (Bank 1) - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"OBD-II code P0171, which indicates a lean fuel mixture is fairly common in many vehicles. 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