{"id":395,"date":"2020-03-30T12:11:42","date_gmt":"2020-03-30T11:11:42","guid":{"rendered":"https:\/\/leasecar.uk\/blog\/?p=395"},"modified":"2025-11-10T11:11:39","modified_gmt":"2025-11-10T11:11:39","slug":"what-to-do-if-your-emission-light-comes-on","status":"publish","type":"post","link":"https:\/\/leasecar.uk\/blog\/what-to-do-if-your-emission-light-comes-on\/","title":{"rendered":"What to do if your emission light comes on"},"content":{"rendered":"\n<p>An\namber symbol of an engine is glowing on your dashboard, but what does it mean?\nEvery image on your dashboard has a purpose and when something lights up to\nindicate a potential problem, it shouldn\u2019t be ignored. The check engine light,\nwhich signifies several possible issues including <a href=\"https:\/\/leasecar.uk\/car-leasing-guide\/what-is-co2-and-why-does-it-matter\/\">emissions<\/a>, is the most common.<\/p>\n\n\n\n<p>The\ncheck engine light (CEL) illuminates after being prompted by the engine control\nunit that manages the engine. If the control unit determines that something in\nyour engine is not functioning properly, it will send the signal to light up\nthe symbol on the dashboard. So, you see it blink to life, but what should you\ndo? <br>\n<br>\nUnlike certain symbols which tell you exactly what is wrong with your vehicle,\nsuch as the coolant temperature light that alerts you of overheating, the CEL\ncan glow for several reasons. Because of this, you should take it to a garage\nfor the technicians to determine the root cause and go from there. <br>\n<br>\nAs you won\u2019t be immediately aware of the cause, there are several things you\ncan do initially to try and solve the issue. <br>\n<br>\n<strong>1. Observe <\/strong><br>\n<br>\nCheck that there are no other symbols on your dashboard indicating additional\nproblems, such as low oil pressure or overheating. If this is the case, pull\nyour vehicle over, shut the engine off and contact a roadside service. <br>\n<br>\n<strong>2. Check gas cap <\/strong><\/p>\n\n\n\n<p>Tighten\nor replace your gas cap as sometimes a broken or loose rubber seal can trigger\nthe light to come on.<\/p>\n\n\n\n<p><strong>3. Reduce pressure <\/strong><br>\n<br>\nIf you think that your vehicle feels different on the road, especially if the\nperformance has decreased, reduce your speed and avoid transporting heavy\ngoods.<\/p>\n\n\n\n<p><strong>4. Check whether the engine light\nis constant or flashing<\/strong><\/p>\n\n\n\n<p>A\nsolid glow tells you that you should have your vehicle inspected soon, however\na blinking CEL is a greater cause for concern and indicates that your vehicle\nshould be inspected by a professional immediately. <\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong> What can cause the emissions light to come on? <\/strong><\/h2>\n\n\n\n<p>There are several different possible triggers for an illuminated engine light. The following are some of the most frequent causes.<br> <\/p>\n\n\n\n<ul>\n<li><strong>Emissions system fault <\/strong><\/li>\n<\/ul>\n\n\n\n<p>Your\nemissions control monitors the volume of carbon monoxide that your vehicle\nemits while in motion. This is something that people are becoming increasingly\naware of by opting for more <a href=\"https:\/\/leasecar.uk\/blog\/guides\/7-best-eco-friendly-cars\/\">eco-friendly\nvehicles<\/a> to\nreduce their carbon footprint. A component of this is the oxygen sensor, which\ncan sense if the engine is burning too much or not enough fuel. This can\ntrigger the CEL to indicate that the car is either running too rich or too\nlean, or that there\u2019s an issue with the sensor itself.&nbsp;&nbsp; <\/p>\n\n\n\n<ul>\n<li><strong>Blocked diesel particulate filter<\/strong><\/li>\n<\/ul>\n\n\n\n<p>This\nfunction measures how easily gas is able to travel through the exhaust. As this\ngas moves through the system, it must pass through the particulate filter,\nwhich removes harmful particles from the exhaust. It does this by oxidising the\nparticles into a fine ash. The CEL may illuminate if this process fails in some\nway, or if the filter becomes blocked. <\/p>\n\n\n\n<ul>\n<li><strong>Mass airflow sensor fault <\/strong><\/li>\n<\/ul>\n\n\n\n<p>The\nengine control unit calculates how much fuel to add to the combustion chambers\nbased on data from the mass airflow sensor. This sensor gathers information\nfrom an air filter, which, if incorrectly installed or clogged, can damage the\nsensor. If this is the case, the CEL will appear.<\/p>\n\n\n\n<ul>\n<li><strong>Ignition system fault <\/strong><\/li>\n<\/ul>\n\n\n\n<p>Responsible\nfor burning the fuel that starts an engine is the ignition system. Faults with\ncomponents such as glow plugs, spark plugs and coil cylinders can all be\nindicated by the CEL. These kinds of faults are known as \u2018misfires\u2019 and repair\noften involves getting replacements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>How to reset an emission warning light <\/strong><\/h2>\n\n\n\n<p>You should take your car to a garage, who will give it a\nfull examination, solve the problem and turn off the light for you. If the\nlight doesn\u2019t turn off automatically, then you can try the following methods.\nIt\u2019s important that you get the problem fixed rather than simply resetting your\nlight without looking into any potential causes. <\/p>\n\n\n\n<p>The easiest method to reset the check engine light is to\ndrive your car as you normally would and let the light turn off naturally by\nitself. If it hasn\u2019t turned off after three days, turn the car on and off three\ntimes consecutively. <\/p>\n\n\n\n<p>If the CEL still isn\u2019t turning off, it\u2019s time to\ndisconnect and reconnect the battery. While the engine is not running, use a\nwrench to disconnect the positive power cable and leave it for 20 minutes. Turn\nthe key in the ignition to the \u2018ON\u2019 position. Reconnect the positive battery\ncable and turn the key in the ignition, wait a few minutes and the CEL should\nbe gone.<\/p>\n\n\n\n<p>If neither of these work, it\u2019s best to take your vehicle\ninto a garage so that a professional can reset your light. They will also run\nproper diagnostics and find the exact cause behind it illuminating in the first\nplace and determine if there are any issues with your car.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Can you drive with the exhaust emissions light on? <\/strong> <\/h2>\n\n\n\n<p>It is safe to drive with an amber check engine light glowing on your dashboard, especially if you cannot detect any problems with the smooth operation of the car. However, it\u2019s always best to find the reason why it came on in the first place, even if that means taking it to be looked at by a professional. If the CEL glows up in red, that is greater cause for concern and you should pull over where appropriate and arrange for immediate inspection. <\/p>\n","protected":false},"excerpt":{"rendered":"An amber symbol of an engine is glowing on your dashboard, but what does it mean? Every image on your dashboard has a purpose and when something lights up to indicate a potential problem, it shouldn\u2019t be ignored. The check engine light, which signifies several possible issues including emissions, is the most common. The check&#8230;","protected":false},"author":1,"featured_media":397,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What to do if your emission light comes on - Leasecar Blog<\/title>\n<meta name=\"description\" content=\"Do you know what to do if your emission light comes on? 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