{"id":527049,"date":"2024-04-23T21:55:39","date_gmt":"2024-04-23T20:55:39","guid":{"rendered":"https:\/\/www.finder.com\/uk\/?p=527049"},"modified":"2026-02-05T16:12:48","modified_gmt":"2026-02-05T16:12:48","slug":"immobilisers","status":"publish","type":"post","link":"https:\/\/www.finder.com\/uk\/car-insurance\/immobilisers","title":{"rendered":"How immobilisers impact car insurance"},"content":{"rendered":"<p>If your car was made from 1998 onwards, it almost certainly has a security device known as an electronic immobiliser installed. Not only can an immobiliser reduce the risk of theft, it can also help keep your car insurance premiums down. Read on to find out how immobilisers work and why owners of older cars might want to think about getting one.<\/p><h3>What is an immobiliser?<\/h3><p>An immobiliser is a device that forms part of your car\u2019s security. It is designed to prevent anyone from driving your car away without the correct key or fob. As such, it helps prevent criminals from stealing your car.<\/p><h4>What are the different types of immobiliser?<\/h4><p>There are a few types of car immobiliser:<\/p><ul><li><strong>Mechanical immobilisers.<\/strong> These are a fairly basic form of immobiliser that you can buy to use on any car. Common types of mechanical immobiliser include steering wheel locks, which prevent your steering wheel from being turned even if someone is able to start the car, and wheel clamps, which can be fastened around your tyres. Parking authorities often use wheel clamps to prevent your car from being moved if it\u2019s illegally parked, but individuals can also buy them as a security device.<\/li><li><strong>Built-in electronic immobilisers.<\/strong> These are built into your car\u2019s ECU (Electronic Control Unit), and prevent your car from starting if a fake key is used in the ignition, or if a thief tries to hotwire your car. They\u2019ve been compulsory for manufacturers to install in new cars since 1998 (known as \u201cfactory-fitted\u201d immobilisers).<\/li><li><strong>Ghost immobilisers.<\/strong> This is one of the newest forms of immobiliser. You have to proactively enter a passcode sequence, using the existing buttons in your car, before your car will start.<\/li><\/ul><h3>How do electronic car immobilisers work?<\/h3><p>The exact details of how immobilisers work isn\u2019t widely publicised, for obvious security reasons. But at a top level, a car immobiliser typically disables 2 or 3 components of your car: the fuel system, the starter motor, and\/or the ignition.<\/p><p>When you use the correct key or fob, it sends a digital code to your car\u2019s ECU. This will then enable the disabled elements and allow your vehicle to start. If a thief tries to use an incorrect key, or tries to hotwire your car, your ECU won\u2019t receive the correct code and the car shouldn\u2019t start.<\/p><h3>How do I know if my car has an electronic immobiliser?<\/h3><p>It became compulsory for car manufacturers to factory-fit immobilisers into cars on 1 October 1998. So, if your car was made since then, you can feel pretty confident that it has an immobiliser.<\/p><p>Immobilisers have been around a bit longer than this though \u2013 since 1992 to be specific. So some pre-1998 cars may have immobilisers that the manufacturer fitted voluntarily. If so, it should be specified in your car\u2019s handbook. You can also try contacting your car\u2019s manufacturer. Other older cars may have had then retrospectively installed. If you have a second-hand car and you\u2019re not sure if it has an immobiliser or not, you can ask a mechanic to check.<\/p><h3>What is a Thatcham device?<\/h3><p>Thatcham is an independent vehicle security firm. The services it offers include rating the security of devices intended to keep cars secure, such as immobilisers and alarms.<\/p><p>It has a number of different categories of car security, with Class 1 offering the most robust security. Immobilisers and other security devices that are \u201cThatcham approved\u201d have been assessed by Thatcham and deemed to have met the criteria for that category of product.<\/p><p>Insurers tend to favour security devices that are Thatcham approved. When you fill in a car insurance application form, you will usually be asked if any devices you have fitted are Thatcham approved.<\/p><ul><li>Category 1 \u2013 Alarm and electronic immobiliser<\/li><li>Category 2 \u2013 Electronic immobiliser<\/li><li>Class 2-1 \u2013 Alarm upgrade (where you add a Thatcham-improved alarm to an existing Category 2 immobiliser)<\/li><li>Category 4 \u2013 Locking wheel devices<\/li><li>Category S5 \u2013Vehicle tracking systems<\/li><li>Category S7 \u2013 Asset location systems (devices that increase the probability of the recovery of a stolen asset)<\/li><\/ul><h3>How do ghost immobilisers work?<\/h3><p>Ghost immobilisers are a more recent innovation than electronic immobilisers, so you\u2019re unlikely to find them built in by the manufacturer. You can add one into a car with an existing electronic immobiliser.<\/p><p>As with electronic immobilisers, a small, discreet device is installed in your car. But it\u2019s not linked to your car key or fob. Instead you set a passcode sequence using the buttons in your car, such as those on the steering wheel, door panels or centre console.<\/p><p>Without putting in the correct passcode, it won\u2019t be possible to start the vehicle.<\/p><h3>Can I fit an electronic immobiliser into an older car?<\/h3><p>Yes. If your car was made before 1998 and doesn\u2019t have a factory-fitted immobiliser, then you can get one fitted retrospectively. You\u2019ll need a mechanic to fit it for you. We\u2019d recommend getting a Thatcham approved one. That\u2019s not only because you\u2019ll have the reassurance that it\u2019s passed independent assessments, but also because insurers are more likely to recognise Thatcham approved devices and offer you a discount on your premiums.<\/p><h3>How much does installing car immobiliser cost?<\/h3><p>If you have an older car without a factory-fitted immobiliser, and want to fit one \u2013 or to upgrade to a ghost immobiliser \u2013 expect to pay between around \u00a3250 and \u00a3600. The cost will depend on the specific features and levels of security. Ghost immobilisers tend to sit at the higher end of the price spectrum.<\/p><article class=\"luna-card luna-card--alt\"><div class=\"luna-card__block\"><div class=\"u-grid\"><div class=\"u-grid__col u-1\/1 no-padding-bottom\"><h3 class=\"has-padding-bottom-x-small\">Will an immobiliser reduce my car insurance premiums?<\/h3><\/div><div class=\"u-grid__col u-1\/6@s\"><p><img decoding=\"async\" class=\"luna-avatar luna-avatar--large\" src=\"https:\/\/www.finder.com\/finder-us\/wp-uploads\/sites\/3\/2020\/07\/Danny-Butler.jpg\" alt=\"Danny Butler\" srcset=\"https:\/\/www.finder.com\/finder-us\/wp-uploads\/sites\/3\/2020\/07\/Danny-Butler.jpg?fit=180 180w, https:\/\/www.finder.com\/finder-us\/wp-uploads\/sites\/3\/2020\/07\/Danny-Butler.jpg?fit=360 360w, https:\/\/www.finder.com\/finder-us\/wp-uploads\/sites\/3\/2020\/07\/Danny-Butler.jpg?fit=600 600w, https:\/\/www.finder.com\/finder-us\/wp-uploads\/sites\/3\/2020\/07\/Danny-Butler.jpg?fit=900 900w, https:\/\/www.finder.com\/finder-us\/wp-uploads\/sites\/3\/2020\/07\/Danny-Butler.jpg?fit=1200 1200w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" loading=\"lazy\"><\/p><div class=\"has-padding-top-small text-x-small\"><em>Finder insurance expert <a href=\"https:\/\/www.finder.com\/uk\/author\/dannybutler\">Danny Butler<\/a> answers <\/em><\/div><\/div><div class=\"u-grid__col u-10\/12@s no-padding-bottom\"><p>Car insurers are a fan of anything that will reduce the risk of you having to make a claim and therefore costing them money. Immobilisers are one of a number of security measures that can reduce the risk of your car being stolen. As such, a car with an immobiliser installed is likely to cost less to insure than an otherwise identical car without an immobiliser.<\/p><p>If you have a modern car, insurers will usually assume when they give a quote that your car has a factory-installed immobiliser. You\u2019ll need to actively correct this assumption if, for whatever reason, the immobiliser has been removed. And you\u2019ll need to actively tell them if you\u2019ve added extra security to a car.<\/p><p>Insurers strongly favour Thatcham approved immobilisers, so if you\u2019re adding an electronic immobiliser to an older car, always opt for a Thatcham approved Category 1 or 2 device.<\/p><p>Ghost immobilisers are a bit of a grey area. They\u2019re a fairly new innovation, and many don\u2019t align with Thatcham\u2019s rating categories. This means most cannot yet be \u201cThatcham approved\u201d. As a result, having a ghost immobiliser fitted might or might not make a difference to your car insurance premiums. This may change over time. But for now, if you\u2019re considering having a ghost alarm fitted, it\u2019s worth checking if there are any models that insurers are more likely to recognise.<\/p><\/div><\/div><\/div><\/article><h3>Do I need an alarm as well as an immobiliser?<\/h3><p>Unlike immobilisers, it is not mandatory for car manufacturers to fit alarms into new cars. Many will now install an alarm voluntarily as a selling point, but there\u2019s no guarantee your car will have an alarm, especially if it\u2019s an older model.<\/p><p>Thatcham (and therefore most insurers, too) regards a combination of an alarm and immobiliser as the top level (Category 1) of car security. So if you want to maximise your car\u2019s security, and the potential savings you can make on your insurance, it\u2019s a good idea to have both an alarm and an immobiliser. You can buy bundled devices or, if your car has an immobiliser but not an alarm, it\u2019s fairly straightforward to get one added. Make sure the alarm you choose is Thatcham approved, as it\u2019s likely to make a difference to your car insurance provider.<\/p><h3>How else can I cut the cost of car insurance?<\/h3><p>The security measures installed in your car are only one of many factors that affects your car insurance premiums. Here are some other tactics to keep costs down.<\/p><ul><li><strong>Compare insurers annually<\/strong>. You might find a much better deal. Even if you\u2019re keen to stay with your current insurer, you can use comparison quotes to negotiate a better deal. <a href=\"https:\/\/www.finder.com\/uk\/car-insurance\">Shopping around<\/a> is particularly important if you\u2019ve been through any big life changes such as getting married or moving house.<\/li><li><strong>Avoid non-essential modifications<\/strong>. While added security is likely to reduce your premiums, most other modifications will do the opposite. So if you care about insurance costs, forego fancy paintwork or massive spoilers.<\/li><li><strong>Pay annually rather than monthly if you can<\/strong>. Insurers apply interest if you pay in monthly instalments, so you\u2019ll usually end up paying less if you\u2019re able to pay in full up-front.<\/li><li><strong>Increase your voluntary excess<\/strong>. Your <a href=\"https:\/\/www.finder.com\/uk\/car-insurance\/car-insurance-excess\">excess<\/a> is the amount you need to pay towards any claim. Typically, the higher you set the excess, the lower your insurance premium will be. Just don\u2019t set it so high you can\u2019t afford to pay it if you need to claim.<\/li><li><strong>Add an experienced driver<\/strong>. Adding a lower-risk, experienced <a href=\"https:\/\/www.finder.com\/uk\/car-insurance\/named-driver-car-insurance\">named driver<\/a> to your policy could lower your premiums, particularly if you\u2019re a young and inexperienced driver.<\/li><li><strong>Drive carefully and avoid the risk of claiming<\/strong>. Every year that you drive safely and avoid needing to claim will increase the <a href=\"https:\/\/www.finder.com\/uk\/car-insurance\/no-claims-bonus\">no-claims discount<\/a> on the following year\u2019s premiums.<\/li><li><strong>Consider telematics insurance<\/strong>. This uses a small device \u2013 a \u201c<a href=\"https:\/\/www.finder.com\/uk\/car-insurance\/young-drivers\/black-box-car-insurance\">black box<\/a>\u201d \u2013 installed in your car to track your driving habits. If you drive carefully and responsibly, you should see your premiums drop.<\/li><\/ul><h3>Pros and cons of having an immobiliser<\/h3><div class=\"fin-pros-cons\">\n            <div class=\"fin-pros-cons__section\">\n            <h4 class=\"fin-pros-cons__heading\">Pros<\/h4>\n            <ul class=\"icon-list icon-list--check-circle\">\n                                    <li>Modern cars almost always have one factory-fitted, so there's no effort required to get one<\/li>\n                                    <li>There's strong evidence that an immobiliser will cut the risk of your car being stolen<\/li>\n                                    <li>Having an immobiliser, especially a Thatcham approved one, should reduce your insurance premiums.<\/li>\n                            <\/ul>\n        <\/div>\n    \n            <div class=\"fin-pros-cons__section\">\n            <h4 class=\"fin-pros-cons__heading\">Cons<\/h4>\n            <ul class=\"icon-list icon-list--x-circle\">\n                                    <li>If your car was made before 1998, you may need to pay to get an immobiliser installed<\/li>\n                                    <li>An immobiliser isn't a fail-safe guarantee against a smart and determined thief<\/li>\n                                    <li>Ghost immobilisers are so new that they're not yet widely recognised by car insurers.<\/li>\n                            <\/ul>\n        <\/div>\n    <\/div>\n<h3>Bottom line<\/h3><p>Immobilisers are an important car security feature. They reduce the risk of your car being stolen and, therefore, also reduce your car insurance premiums. Most people don\u2019t need to weigh up whether or not to get an immobiliser installed in their car, as it\u2019s been compulsory for manufacturers to include them since 1998. If you have an older car, it\u2019s pretty straightforward to get one added. Make sure you get a Thatcham approved one, as they\u2019re more widely recognised by insurers.<\/p><h3>Frequently asked questions<\/h3><ul class=\"luna-accordionGroup accordionGroup\"><li class=\"luna-accordion\" data-accordion=\"accordion\">\n  <div class=\"luna-accordion__summary\">\n    <h4 class=\"luna-accordion__heading\">\n      <button class=\"luna-accordion__action collapsed\" aria-expanded=\"false\" aria-controls=\"accordion0000000000\" data-toggle=\"collapse\" data-target=\"#accordion0000000000\">\n        <span class=\"luna-accordion__title\">How effective are immobilisers at preventing theft?<\/span>\n        <svg class=\"luna-icon\" aria-hidden=\"true\">\n          <use xlink:href=\"#chevron-down\" data-accordion-icon=\"show\"><\/use>\n          <use xlink:href=\"#chevron-up\" data-accordion-icon=\"hide\" class=\"is-hidden\"><\/use>\n        <\/svg>\n      <\/button>\n    <\/h4>\n  <\/div>\n  <div class=\"luna-accordion__details collapse\" aria-hidden=\"true\" id=\"accordion0000000000\" data-accordion=\"details\">\n    <div class=\"accordionContent\"> There\u2019s a decent body of evidence that immobilisers can significantly cut the chance of a car being stolen. But, sadly, for every security innovation, there are plenty of tech-savvy criminals looking for ways to get round the system. The same is true of electronic immobilisers. So while an immobiliser can certainly slow a thief down and reduce the chance of your car being nicked, it\u2019s not a guarantee that \u2013 with enough time \u2013 a thief couldn\u2019t crack the system. Car security specialists must be constantly on their toes to make sure their devices stay ahead of the criminals. <\/div>\n  <\/div>\n<\/li><li class=\"luna-accordion\" data-accordion=\"accordion\">\n  <div class=\"luna-accordion__summary\">\n    <h4 class=\"luna-accordion__heading\">\n      <button class=\"luna-accordion__action collapsed\" aria-expanded=\"false\" aria-controls=\"accordion0000000001\" data-toggle=\"collapse\" data-target=\"#accordion0000000001\">\n        <span class=\"luna-accordion__title\">Does an immobiliser count as a modification?<\/span>\n        <svg class=\"luna-icon\" aria-hidden=\"true\">\n          <use xlink:href=\"#chevron-down\" data-accordion-icon=\"show\"><\/use>\n          <use xlink:href=\"#chevron-up\" data-accordion-icon=\"hide\" class=\"is-hidden\"><\/use>\n        <\/svg>\n      <\/button>\n    <\/h4>\n  <\/div>\n  <div class=\"luna-accordion__details collapse\" aria-hidden=\"true\" id=\"accordion0000000001\" data-accordion=\"details\">\n    <div class=\"accordionContent\"> If it\u2019s factory-fitted, then it\u2019s not a modification. If you have one installed yourself, then yes, it is technically a modification. And if you\u2019ve read any of our other guides on how to keep down the cost of car insurance, you\u2019ll probably be aware that modifying your car is often a bad idea from a car insurer\u2019s perspective. Car customisations can often make you a higher risk for insurers. That\u2019s because many modifications make your car more expensive to repair (such as custom paint jobs or tinted windows), or more likely to be involved in an accident (such as upgrades to the turbocharger). However, insurers look more favourably on modifications that reduce your risk level. So even though if it is a modification, installing an immobiliser \u2013 especially a Thatcham approved one \u2013 is likely to reduce your car insurance premiums. <\/div>\n  <\/div>\n<\/li><li class=\"luna-accordion\" data-accordion=\"accordion\">\n  <div class=\"luna-accordion__summary\">\n    <h4 class=\"luna-accordion__heading\">\n      <button class=\"luna-accordion__action collapsed\" aria-expanded=\"false\" aria-controls=\"accordion0000000002\" data-toggle=\"collapse\" data-target=\"#accordion0000000002\">\n        <span class=\"luna-accordion__title\">What do I do if I'm having problems with my immobiliser?<\/span>\n        <svg class=\"luna-icon\" aria-hidden=\"true\">\n          <use xlink:href=\"#chevron-down\" data-accordion-icon=\"show\"><\/use>\n          <use xlink:href=\"#chevron-up\" data-accordion-icon=\"hide\" class=\"is-hidden\"><\/use>\n        <\/svg>\n      <\/button>\n    <\/h4>\n  <\/div>\n  <div class=\"luna-accordion__details collapse\" aria-hidden=\"true\" id=\"accordion0000000002\" data-accordion=\"details\">\n    <div class=\"accordionContent\"> Faults are fairly uncommon, but if you experience an issue \u2013 for example if your car won\u2019t start even though you\u2019re using the correct fob \u2013 it could simply be a case of needing to replace your key fob\u2019s battery. Failing this, contact the manufacturer, or the garage or dealer you bought the car from for advice. You may need to get a mechanic involved. <\/div>\n  <\/div>\n<\/li><\/ul><article class=\"luna-card luna-card--alt\"><div class=\"luna-card__block\">*Based on data provided by Consumer Intelligence Ltd, www.consumerintelligence.com (January \u201926). 51% of Confused.com car insurance customers could save \u00a3529.15.<\/div><\/article>","protected":false},"excerpt":{"rendered":"<p>Your car&#8217;s security can have an important impact on your insurance premiums; here&#8217;s how immobilisers fit into your vehicle&#8217;s security suite. <\/p>\n","protected":false},"author":805,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"apple_news_api_created_at":"","apple_news_api_id":"","apple_news_api_modified_at":"","apple_news_api_revision":"","apple_news_api_share_url":"","apple_news_cover_media_provider":"image","apple_news_coverimage":0,"apple_news_coverimage_caption":"","apple_news_cover_video_id":0,"apple_news_cover_video_url":"","apple_news_cover_embedwebvideo_url":"","apple_news_is_hidden":"","apple_news_is_paid":"","apple_news_is_preview":"","apple_news_is_sponsored":"","apple_news_maturity_rating":"","apple_news_metadata":"\"\"","apple_news_pullquote":"","apple_news_pullquote_position":"","apple_news_slug":"","apple_news_sections":[],"apple_news_suppress_video_url":false,"apple_news_use_image_component":false,"footnotes":""},"categories":[2645],"tags":[],"asset_tag":[],"class_list":["post-527049","post","type-post","status-publish","format-standard","hentry","category-car-insurance"],"apple_news_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.9 (Yoast SEO v24.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How immobilisers impact car insurance - Finder UK<\/title>\n<meta name=\"description\" content=\"Your car&#039;s security can have an important impact on your insurance premiums; 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