{"id":12640,"date":"2025-10-29T20:35:42","date_gmt":"2025-10-29T20:35:42","guid":{"rendered":"https:\/\/carexamer.com\/blog\/?p=12640"},"modified":"2026-01-25T00:30:12","modified_gmt":"2026-01-25T00:30:12","slug":"will-a-car-fail-mot-with-the-airbag-light-on","status":"publish","type":"post","link":"https:\/\/carexamer.com\/blog\/will-a-car-fail-mot-with-the-airbag-light-on\/","title":{"rendered":"Will a Car Fail MOT with the Airbag Light On?"},"content":{"rendered":"\n<p>If your <strong>airbag warning light<\/strong> is on, it can raise an important question before your MOT: <em>will my car fail the test?<\/em> The airbag system, also known as the <strong>Supplemental Restraint System (SRS)<\/strong>, is a critical safety feature that protects you in the event of a crash. In the UK, MOT testers must ensure all safety systems are working correctly. Since the airbag is part of the car\u2019s safety restraint system, any fault indicated by the warning light will affect your MOT result. This guide explains what the airbag light means, whether it causes an MOT failure, and how much repairs typically cost in the UK.<\/p>\n\n\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-16018d1d wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button has-custom-font-size has-small-font-size\"><a class=\"wp-block-button__link has-vivid-cyan-blue-background-color has-background wp-element-button\" href=\"https:\/\/carexamer.com\/\">Book inspection<\/a><\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What the Airbag Light Means<\/h2>\n\n\n\n<p>When you start the car, the airbag light should turn on for a few seconds and then go out. This short illumination is a normal self-check.<\/p>\n\n\n\n<p>If the light stays on or flashes, it means the system has detected a problem. The issue could be caused by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A <strong>faulty seatbelt pretensioner sensor<\/strong><\/li>\n\n\n\n<li><strong>Loose wiring<\/strong> under the front seats<\/li>\n\n\n\n<li>A <strong>broken clock spring<\/strong> in the steering wheel<\/li>\n\n\n\n<li>A <strong>defective airbag module or crash sensor<\/strong><\/li>\n\n\n\n<li><strong>Low battery voltage<\/strong> or a recent power issue<\/li>\n<\/ul>\n\n\n\n<p>When this light is illuminated, one or more airbags may not deploy correctly in an accident, which reduces overall protection for the driver and passengers.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Will a Car Fail an MOT with the Airbag Light On?<\/h2>\n\n\n\n<p>Yes, your car <strong>will fail the MOT<\/strong> if the airbag light is on.<\/p>\n\n\n\n<p>The <strong>DVSA (Driver and Vehicle Standards Agency)<\/strong> states that an illuminated SRS light is classed as a <strong>major defect<\/strong>. The MOT tester must fail the car if:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The light stays on after the system check<\/li>\n\n\n\n<li>The light does not illuminate at all when the ignition is turned on<\/li>\n\n\n\n<li>Any part of the airbag system appears to be missing, disconnected, or deliberately disabled<\/li>\n<\/ul>\n\n\n\n<p>In other words, the airbag system must work correctly, and the light must operate as designed for your car to pass the MOT.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Common Causes of an Airbag Warning Light<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Cause<\/th><th>Description<\/th><th>Typical UK Repair Cost<\/th><\/tr><\/thead><tbody><tr><td>Faulty Seatbelt Pretensioner<\/td><td>Broken connector or sensor fault<\/td><td>\u00a3150 \u2013 \u00a3300<\/td><\/tr><tr><td>Steering Wheel Clock Spring<\/td><td>Worn or damaged wiring connection<\/td><td>\u00a3200 \u2013 \u00a3400<\/td><\/tr><tr><td>Airbag Control Module Fault<\/td><td>Internal failure or software error<\/td><td>\u00a3300 \u2013 \u00a3800<\/td><\/tr><tr><td>Loose Wiring Under Seat<\/td><td>Common due to seat movement<\/td><td>\u00a360 \u2013 \u00a3150<\/td><\/tr><tr><td>Low Battery Voltage<\/td><td>Weak battery causing fault code<\/td><td>\u00a350 \u2013 \u00a3120<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Fix the Airbag Light Before MOT<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Inspect the seat wiring<\/strong> under the front seats. Loose or corroded connections are very common.<\/li>\n\n\n\n<li><strong>Use a diagnostic scanner<\/strong> to identify the fault code accurately.<\/li>\n\n\n\n<li><strong>Repair or replace the faulty part<\/strong>, such as a sensor, module, or wiring harness.<\/li>\n\n\n\n<li><strong>Clear the error codes<\/strong> using professional diagnostic equipment and verify that the light stays off.<\/li>\n<\/ol>\n\n\n\n<p>Most garages can repair airbag issues within a few hours once the fault is identified.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Is It Safe to Drive with the Airbag Light On?<\/h2>\n\n\n\n<p>It is <strong>not safe<\/strong> to drive long-term with the airbag light on. While the car may still operate normally, the airbags may not deploy in a collision.<\/p>\n\n\n\n<p>In some cases, a faulty SRS system can disable airbags completely or cause them to deploy incorrectly. This poses a real safety risk.<\/p>\n\n\n\n<p>If both the <strong>airbag light<\/strong> and <strong>seatbelt light<\/strong> are illuminated, you should have the system checked immediately by a qualified technician.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">How to Prevent Airbag Light Problems<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Avoid moving seats<\/strong> while the ignition is on.<\/li>\n\n\n\n<li><strong>Keep battery voltage healthy<\/strong>; low power can trigger SRS faults.<\/li>\n\n\n\n<li><strong>Service the airbag system<\/strong> according to the manufacturer\u2019s schedule.<\/li>\n\n\n\n<li><strong>Do not remove or replace seats<\/strong> without disconnecting the battery first.<\/li>\n\n\n\n<li><strong>Address warning lights quickly<\/strong> to prevent further damage.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">MOT and Pre-Purchase Inspection Advice<\/h2>\n\n\n\n<p>If you are buying a used car and notice that the airbag light stays on, this means the SRS system is not functioning properly. It may pass a basic drive test but will fail its MOT.<\/p>\n\n\n\n<p>A <strong>CAREXAMER pre-purchase inspection<\/strong> can detect dashboard warning lights, wiring faults, and airbag-related issues before you buy the car.<\/p>\n\n\n\n<p>If your car fails its MOT due to an airbag warning light, you must have the fault repaired and the car retested before you can legally drive it again.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Summary of Airbag Light Causes and Costs<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Problem<\/th><th>Effect<\/th><th>UK Repair Cost<\/th><\/tr><\/thead><tbody><tr><td>Loose seat wiring<\/td><td>Intermittent airbag fault<\/td><td>\u00a360 \u2013 \u00a3150<\/td><\/tr><tr><td>Pretensioner sensor fault<\/td><td>Warning light stays on<\/td><td>\u00a3150 \u2013 \u00a3300<\/td><\/tr><tr><td>Clock spring fault<\/td><td>Airbag disabled<\/td><td>\u00a3200 \u2013 \u00a3400<\/td><\/tr><tr><td>Control module fault<\/td><td>Entire system failure<\/td><td>\u00a3300 \u2013 \u00a3800<\/td><\/tr><tr><td>Battery voltage issue<\/td><td>False warning<\/td><td>\u00a350 \u2013 \u00a3120<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p>A <strong>car will fail its MOT if the airbag light is on<\/strong>, as it means a critical safety system is not working properly.<\/p>\n\n\n\n<p>Although the car may still drive, it will not offer full protection in an accident.<\/p>\n\n\n\n<p>Typical <strong>UK repair costs<\/strong> range from <strong>\u00a350 for a simple wiring repair<\/strong> to about <strong>\u00a3800 for a full airbag module replacement<\/strong>, depending on the issue.<\/p>\n\n\n\n<p>For safety and compliance, always have the airbag system repaired by a qualified professional. If you are buying a used car, a <strong>CAREXAMER inspection<\/strong> can highlight any airbag or electrical problems before you purchase.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/carexamer.com\/blog\/sed-volkswagen-vw-vehicle-inspection\/\">Buying a used VW.<\/a>\u00a0<a href=\"https:\/\/carexamer.com\/blog\/a-guide-to-inspecting-a-used-vauxhall-vehicle\/\">Buying used vauxhall<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-bmw-inspection\/\">BMW<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-jaguar-inspection\/\">Jaguar<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-ford-vehicle-inspection\/\">Ford<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-volvo-car-inspection\/\">Volvo<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-range-rover-suv-inspection\/\">Range rover<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-bentley-vehicle-inspection\/\">Bentley<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-aston-martin-vehicle-inspection\/\">Aston Martin<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/the-used-porsche-vehicle-inspection\/\">Porsche<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-ferrari-vehicle-inspection\/\">Ferrari<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-lamborghini-vehicle-inspection\/\">Lamborghini<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-maserati-vehicle-inspection\/\">Maserati<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/used-hyundai-vehicle-inspections\/\">Hyunda<\/a>i,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/comprehensive-guide-to-tesla-vehicle-inspection\/\">Tesla<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/comprehensive-guide-to-a-used-honda-pre-purchase-inspection\/\">Honda<\/a>,\u00a0<a href=\"https:\/\/carexamer.com\/blog\/comprehensive-guide-to-used-pagani-pre-purchase-inspection\/\">Pagani<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If your airbag warning light is on, it can raise an important question before your MOT: will my car fail<\/p>\n","protected":false},"author":2,"featured_media":12641,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-12640","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car-problems-and-repair-costs"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.0 (Yoast SEO v23.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Will a Car Fail MOT with the Airbag Light On?<\/title>\n<meta name=\"description\" content=\"Find out if your car will fail MOT with the airbag light on. 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