{"id":1181,"date":"2025-09-04T09:26:56","date_gmt":"2025-09-04T09:26:56","guid":{"rendered":"https:\/\/www.way.com\/ask\/?p=1181"},"modified":"2026-04-28T08:13:59","modified_gmt":"2026-04-28T08:13:59","slug":"how-do-i-fix-code-p0174","status":"publish","type":"post","link":"https:\/\/www.way.com\/ask\/how-do-i-fix-code-p0174\/","title":{"rendered":"How do i fix code P0174?"},"content":{"rendered":"<p>The most efficient combustion engines use an air-fuel ratio of 14.7 parts air to 1 part fuel. A lean condition occurs when there is more than 14.7 parts of air for every 1 part of fuel, which triggers the P0174 code.<\/p>\n<p>A lean state can be caused by a vacuum leak that allows too much air into the mix, or a fuel system that doesn&#8217;t supply enough fuel. The powertrain control module (PCM) tries to fix the lean condition by adding more fuel to keep the mixture at the correct 14.7:1 ratio. A code P0174 appears when these adjustments become too large.<\/p>\n<p><span data-preserver-spaces=\"true\">The diagnostic trouble code (DTC) P0174 shows \u2018System Too Lean (Bank 2).\u2019 This means the air-fuel mixture in your vehicle is too lean. For your car to run, the fuel needs to mix with oxygen before it burns.<\/span><\/p>\n<p><span data-preserver-spaces=\"true\">The mixture burns completely when the air and gas are present in the correct proportions. Your vehicle will not run efficiently if the mixture is too lean.\u00a0<\/span><\/p>\n<p><strong>The codes P0171 and P0174 appear when the engine is in a lean condition. The P0171 code activates when cylinder bank 1 is in a lean condition, while the P0174 code activates when cylinder bank 2 is in a lean condition.<\/strong><\/p>\n<p><span data-preserver-spaces=\"true\">The Engine\/Powertrain Control Module (ECM\/PCM) can fix a lean situation to some extent. However, it stores the P0174 code to alert you to resolve this issue.<\/span><\/p>\n<h2><span data-preserver-spaces=\"true\">P0174 code causes<\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">The P0174 engine code indicates <\/span><span data-preserver-spaces=\"true\">that there is<\/span><span data-preserver-spaces=\"true\"> an issue with the air\/fuel ratio provided to your engine. There are several reasons for this, ranging from air leaks and fuel injector issues to malfunctioning sensors. These include:<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Faulty mass airflow (MAF) sensor\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Presence of blockage in the fuel filter and fuel injectors<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">The fuel pump is getting weak\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Weakening the fuel pressure regulator\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">The vacuum connector or PCV line can have cracks or damage\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Defective oxygen sensor\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Issues with PCM\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Leakage in the brake booster\u00a0<\/span><\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-3914 aligncenter\" src=\"https:\/\/www.way.com\/ask\/wp-content\/uploads\/2025\/09\/obd-scan-3-1.png\" alt=\"code 0174\" width=\"1536\" height=\"1024\" \/><\/p>\n<h2><span data-preserver-spaces=\"true\">Symptoms of the P0174 code\u00a0<\/span><\/h2>\n<p><span data-preserver-spaces=\"true\">You may notice the following symptoms if your vehicle has an error code P0174.<\/span><\/p>\n<ul>\n<li><span data-preserver-spaces=\"true\">Check Engine Light turns on\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Decrease in engine performance. You will feel a lack of power while accelerating.\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">The engine starts to misfire\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Increase in fuel consumption\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Rough idling\u00a0\u00a0<\/span><\/li>\n<li><span data-preserver-spaces=\"true\">Engine stalling\u00a0<\/span><\/li>\n<\/ul>\n<p><span data-preserver-spaces=\"true\">Lean-running vehicles release nitrogen oxides (NOx), which can harm your health and lead to respiratory issues like asthma. Running your engine lean can also cause misfires. These misfires can damage your car&#8217;s catalytic converter and other parts over time. If you notice any of these symptoms, take your car to a qualified technician as soon as possible.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The most efficient combustion engines use an air-fuel ratio of 14.7 parts air to 1 part fuel. A lean condition occurs when there is more than 14.7 parts of air for every 1 part of fuel, which triggers the P0174 code. A lean state can be caused by a vacuum leak that allows too much&hellip; <a class=\"more-link\" href=\"https:\/\/www.way.com\/ask\/how-do-i-fix-code-p0174\/\">Continue reading <span class=\"screen-reader-text\">How do i fix code P0174?<\/span><\/a><\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1181","post","type-post","status-publish","format-standard","hentry","category-car-repair-maintenance","entry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How do i fix code P0174? - ask<\/title>\n<meta name=\"description\" content=\"Engine code P0174 can result in your car&#039;s lean condition. What is P0174 code? How does it happen? How can you fix it? 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