{"id":3804,"date":"2026-02-04T14:46:03","date_gmt":"2026-02-04T14:46:03","guid":{"rendered":"https:\/\/www.regplates.com\/blog\/?p=3804"},"modified":"2026-02-04T14:47:48","modified_gmt":"2026-02-04T14:47:48","slug":"mot-number-plate-fails-the-10-most-common-reasons-and-how-to-fix-them-cheaply","status":"publish","type":"post","link":"https:\/\/www.regplates.com\/blog\/2026\/02\/04\/mot-number-plate-fails-the-10-most-common-reasons-and-how-to-fix-them-cheaply\/","title":{"rendered":"MOT Number Plate Fails: The 10 Most Common Reasons (and How to Fix Them Cheaply)"},"content":{"rendered":"\n<p>When MOT time rolls around, most drivers worry about brakes, emissions, or suspension issues. But one of the most common \u2014 and easily avoidable \u2014 reasons for MOT failure is the humble number plate. It might seem like a small detail, yet the MOT test has strict rules around plates, and even minor issues can lead to a fail.<\/p>\n\n\n\n<p>The good news? Almost all number plate\u2011related MOT failures are quick, simple, and inexpensive to fix. In this guide, we\u2019ll break down the <strong>10 most common MOT number plate fails<\/strong>, explain why they matter, and show you how to sort them without spending a fortune.<\/p>\n\n\n\n<p><strong>1. Number Plates That Are Too Dirty to Read<\/strong><\/p>\n\n\n\n<p>It sounds obvious, but thousands of vehicles fail their MOT every year because the plates are simply too dirty. Mud, road salt, and grime can obscure characters, making them unreadable to both MOT testers and ANPR cameras.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>A bucket of warm water and a sponge. That\u2019s it. Clean your plates before the test \u2014 front and back \u2014 and you\u2019ll avoid one of the easiest fails on the list.<\/p>\n\n\n\n<p><strong>2. Cracked or Damaged Plates<\/strong><\/p>\n\n\n\n<p>Even small cracks can distort characters or create sharp edges, which is enough for an MOT fail. Damage often comes from minor bumps, pressure washers, or stones flicked up from the road.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Replacement plates are inexpensive, especially when ordered online. RegPlates offers fully road\u2011legal replacements that meet all DVLA and MOT standards. <a href=\"https:\/\/www.regplates.com\/pawn-your-number-plate\" title=\"\">You can explore options here: <\/a><\/p>\n\n\n\n<p><strong>3. Incorrect Spacing or Fonts<\/strong><\/p>\n\n\n\n<p>The MOT test follows strict DVLA rules on character spacing, margins, and font style. If your plate has been customised illegally \u2014 for example, squeezed spacing to mimic a name \u2014 it will fail.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Order a new, fully compliant plate. If you\u2019re unsure whether your current spacing is legal, RegPlates has a helpful guide: https:\/\/www.regplates.com\/number-plate-rules(regplates.com in Bing)<\/p>\n\n\n\n<p><strong>4. Faded or Discoloured Plates<\/strong><\/p>\n\n\n\n<p>Over time, UV exposure and weathering can cause plates to fade. Yellow rear plates often bleach to a pale cream, and white front plates can yellow or dull. If the contrast between the background and characters is reduced, it\u2019s an MOT fail.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Replacement is the only option. Fortunately, modern acrylic plates are durable and affordable. If your plates are more than 5\u20137 years old, replacing them before the MOT is often a smart move.<\/p>\n\n\n\n<p><strong>5. Loose or Poorly Secured Plates<\/strong><\/p>\n\n\n\n<p>A number plate that\u2019s hanging off, rattling, or insecure is a fail. MOT testers must ensure the plate is firmly attached and won\u2019t fall off during normal driving.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>A simple fix:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use new screws or sticky pads<\/li>\n\n\n\n<li>Ensure the plate is flush against the vehicle<\/li>\n\n\n\n<li>Avoid overtightening, which can cause cracks<\/li>\n<\/ul>\n\n\n\n<p>A pack of adhesive pads costs just a few pounds and can be fitted in minutes.<\/p>\n\n\n\n<p><strong>6. Incorrect Colour or Reflectivity<\/strong><\/p>\n\n\n\n<p>UK law requires:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>White reflective plate with black characters at the front<\/strong><\/li>\n\n\n\n<li><strong>Yellow reflective plate with black characters at the rear<\/strong><\/li>\n<\/ul>\n\n\n\n<p>If your plates have tinted covers, coloured backgrounds, or non\u2011reflective materials, they will fail.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Remove any tinted covers immediately \u2014 they\u2019re illegal. If the plate itself is non\u2011compliant, replace it with a standard reflective acrylic plate.<\/p>\n\n\n\n<p><strong>7. Missing Supplier Name or BS AU 145e Marking<\/strong><\/p>\n\n\n\n<p>Since September 2021, all new number plates must meet the <strong>BS AU 145e<\/strong> standard. This includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The supplier\u2019s name and postcode<\/li>\n\n\n\n<li>The British Standard code<\/li>\n\n\n\n<li>A valid font and layout<\/li>\n<\/ul>\n\n\n\n<p>If these markings are missing, the plate is not road\u2011legal and will fail the MOT.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Order a new plate from a DVLA\u2011registered supplier. RegPlates ensures all plates meet the latest standards, so you\u2019re covered.<\/p>\n\n\n\n<p><strong>8. Illegal Decorative Elements<\/strong><\/p>\n\n\n\n<p>This includes:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Stickers<\/li>\n\n\n\n<li>Background patterns<\/li>\n\n\n\n<li>Non\u2011standard flags<\/li>\n\n\n\n<li>3D gel characters that don\u2019t meet the new standard<\/li>\n\n\n\n<li>Raised lettering that exceeds permitted dimensions<\/li>\n<\/ul>\n\n\n\n<p>While some decorative styles used to be tolerated, MOT rules have tightened significantly.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Remove any stickers or covers. If the plate itself is non\u2011compliant, replace it with a legal version. You can still personalise your plate legally \u2014 just ensure it meets DVLA rules.<\/p>\n\n\n\n<p><strong>9. Incorrect or Missing Flags and Identifiers<\/strong><\/p>\n\n\n\n<p>Legal flags include:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Union Jack<\/li>\n\n\n\n<li>Cross of St George<\/li>\n\n\n\n<li>Cross of St Andrew<\/li>\n\n\n\n<li>Red Dragon of Wales<\/li>\n\n\n\n<li>EU flag (for older plates only)<\/li>\n<\/ul>\n\n\n\n<p>Anything else \u2014 such as football badges or novelty icons \u2014 is an MOT fail.<\/p>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>If your plate has an illegal flag, you\u2019ll need a replacement. Legal flags are inexpensive and can be added when ordering a new plate.<\/p>\n\n\n\n<p><strong>10. Number Plates That Don\u2019t Match DVLA Records<\/strong><\/p>\n\n\n\n<p>If the plate on the vehicle doesn\u2019t match the DVLA registration, the MOT tester must fail the vehicle. This can happen if:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>A private plate was removed but the old plates weren\u2019t refitted<\/li>\n\n\n\n<li>A plate was misprinted<\/li>\n\n\n\n<li>A cloned plate was unknowingly purchased<\/li>\n<\/ul>\n\n\n\n<p><strong>How to Fix It Cheaply<\/strong><\/p>\n\n\n\n<p>Check your V5C and ensure the plate on the car matches the official registration. If you\u2019ve recently transferred a private plate, confirm the change on the <a href=\"https:\/\/www.personalisedvehicleregistration.service.gov.uk\/assign\/vehicle-lookup\" target=\"_blank\" rel=\"noopener nofollow\" title=\"\">official DVLA site:<\/a><\/p>\n\n\n\n<p>If you suspect your plate may be cloned, contact the police and DVLA immediately.<\/p>\n\n\n\n<p><strong>How to Avoid MOT Number Plate Fails Altogether<\/strong><\/p>\n\n\n\n<p>A quick pre\u2011MOT check can save you time, money, and stress. Before your test:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Clean both plates<\/li>\n\n\n\n<li>Check for cracks or fading<\/li>\n\n\n\n<li>Ensure the plate is secure<\/li>\n\n\n\n<li>Confirm spacing and font are legal<\/li>\n\n\n\n<li>Look for the BS AU 145e marking<\/li>\n\n\n\n<li>Remove any covers or decorations<\/li>\n<\/ul>\n\n\n\n<p>If anything looks questionable, replacing the plate is usually the cheapest and easiest solution.<\/p>\n\n\n\n<p><strong>Why Number Plates Matter More Than You Think<\/strong><\/p>\n\n\n\n<p>Number plates aren\u2019t just for identification \u2014 they\u2019re essential for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ANPR enforcement<\/li>\n\n\n\n<li>Speed cameras<\/li>\n\n\n\n<li>Congestion and clean\u2011air zone charging<\/li>\n\n\n\n<li>Vehicle security<\/li>\n\n\n\n<li>Insurance validation<\/li>\n<\/ul>\n\n\n\n<p>A non\u2011compliant plate can lead to:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MOT failure<\/li>\n\n\n\n<li>Police fines<\/li>\n\n\n\n<li>Points on your licence<\/li>\n\n\n\n<li>Your vehicle being flagged as suspicious<\/li>\n<\/ul>\n\n\n\n<p>Given how inexpensive legal plates are, it\u2019s simply not worth the risk.<\/p>\n\n\n\n<p><strong>Final Thoughts<\/strong><\/p>\n\n\n\n<p>Number plate\u2011related MOT failures are some of the easiest to avoid \u2014 and the cheapest to fix. Whether your plates are dirty, damaged, faded, or non\u2011compliant, the solution is usually quick and affordable.<\/p>\n\n\n\n<p>If you need new plates, want to check the legality of your current ones, or are considering a<a href=\"https:\/\/www.regplates.com\/private-number-plate-ideas\" title=\"\"> personalised registration<\/a>, RegPlates has everything you need to stay road\u2011legal and stylish.<\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>When MOT time rolls around, most drivers worry about brakes, emissions, or suspension issues. But one of the most common \u2014 and easily avoidable \u2014 reasons for MOT failure is the humble number plate. It might seem like a small<\/p>\n<p><a class=\"btn btn-xs btn-info read-more\" href=\"https:\/\/www.regplates.com\/blog\/2026\/02\/04\/mot-number-plate-fails-the-10-most-common-reasons-and-how-to-fix-them-cheaply\/\" role=\"button\">read more<\/a><\/p>\n","protected":false},"author":2,"featured_media":3805,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[2,85],"tags":[],"class_list":["post-3804","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-car-reg-plate-news","category-how-to"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/posts\/3804","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/comments?post=3804"}],"version-history":[{"count":1,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/posts\/3804\/revisions"}],"predecessor-version":[{"id":3806,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/posts\/3804\/revisions\/3806"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/media\/3805"}],"wp:attachment":[{"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/media?parent=3804"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/categories?post=3804"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.regplates.com\/blog\/wp-json\/wp\/v2\/tags?post=3804"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}