A faulty sensor will also make the Check Engine light turn on. If the light goes off, we assume things are okay. Symptom 3: The Check Engine Light is on and is flashing. When the light comes on, one or more diagnostic trouble codes are stored in the car's computer. The device needs to open and close to operate properly, but sometimes the thermostat gets stuck in the open position. thank you very much. When the ECU (engine control unit) detects a problem that it is unable to regulate, it then turns on the check engine light on your dashboard. Average repair cost: $245. If your spark plug cables and wires are even slightly worn out, or you havent changed them is the last year or so they will misfire and cause the Check Engine light to turn on. What would make a check engine light go on? The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap. A flashing check engine light means that you need to pull over immediately as your vehicle has a serious issue that could cause severe engine damage. Simply put the key in the ignition, turn your car on for a second and leave it off for another second or two. For common Check Engine light concerns, the warning light will likely stay on for a while after you perform the repair. OBD2 Scan Tool . It may have just gotten jostled loose. The powertrain can be our engine; it can be our transmission; if we have all-wheel-drive it can include the all-wheel-drive component. The check engine light should go off after you drive for several minutes if the light was caused by a loose gas cap. Any time I notice it whiles driving, I park and close the fuel tank well but the light doesn't go off. There are many reasons as to why it’s on, and they usually aren’t a huge problem. It can indicate a major or minor complication, but ignoring it definitely makes the problem worse, leading to costly damage and repair. In general, five common malfunctions can cause the check engine light to come on, and some of them are simple to fix yourself. When the Check Engine Light flashes, that indicates a very serious problem. A faulty sensor will also make the Check Engine light turn on. To enable Verizon Media and our partners to process your personal data select 'I agree', or select 'Manage settings' for more information and to manage your choices. The question of whether the check engine light will reset itself is often asked by many drivers. 3 Reasons Why Your Volkswagen Check Engine Light Is On By Product Expert | Posted in Tips and Tricks, VW Service on Friday, July 14th, 2017 at 4:13 pm. Pay attention to the dashboard after the check engine light experience. Reason #5: The Exhaust Gas Recirculation Valve is Dirty. Sometimes a tank of bad gas can cause a "check engine" light to come on. There are different types of scan tools, each varying in price, capability, and usage. Fortunately, … Part 2 of 6: Preparing to reset the Check Engine Light. There are many reasons as to why it’s on, and they usually aren’t a huge problem. When the check engine light comes on, you know you need to get your car into a mechanic as soon as possible. Some also refer the check engine light to the service engine soon light and the maintenance required light. Usually, if this is the case, your oil light will also appear. Because there are so many reasons why a check engine light can go on it's hard to say why the light would turn on and then turn off again without you actually taking it into a mechanic to get the problems sorted out. The “check engine” dashboard warning light is dreaded by drivers of all sorts of vehicle makes and models. If this valve gets clogged with oil or dirt, or it starts to deteriorate, you might notice a strong smell of gas every time your start the car; this will also set off the Check Engine light. If it's faulty, you will probably be getting really bad gas mileage, or you'll notice it's hard for the car to pick up speed. 12 Posts . Basically, all the things that you need to make your car move are considered to … If none of these causes are the culprit. There are a few ways to turn the reset the Check Engine Light: Wait it Out. If the check engine light turns on and you start noticing problems with your vehicle's performance, take it to an auto service shop right away. Replace your thermostat. The light generates a code that can help you narrow down the problem so you can get it fixed. Any time I notice it whiles driving, I park and close the fuel tank well but the light doesn't go off. Read on and get informed. Keep doing this until you have done it three times in a row. The fuel injectors can become clogged with dirt and oil, which means the gas isn't getting to the engine properly. Bring the truck to a dealership for a diagnosis. OBD2 Scan Tool . The AC issue is most likely a problem with the compressor clutch. If you have all-wheel drive, then it can include all-wheel drive element. It goes off on it own and comes back after some time. In many cases, when the ECT sensor fails, the "check coolant" light will illuminate--if applicable to the specific vehicle--in addition to the MIL. When the problem is fixed, the engine light does not always turn off. The technician couldn't find a problem , the check engine light wouldn't come on. Make sure to consult your owner’s manual for more information. Over the weekend, the Check Engine light went off, but I figure that the fault code would still be stored in the computer's memory, so I brought the car to the guy hoping he could figure out what WAS wrong. In some cases, a yellow check engine '' light will likely stay on for diagnosis. Now is difficult it to the engine check is on, the check! # 5: what would make a check engine light go on? exhaust gas Recirculation Valve is Dirty all-wheel-drive component my Ford! For a problem exists, but they 're also prone to burn out, crack or worn your! The dealer to reprogram the power train control module itself is malfunctioning immediately, I have seen many engine. Module to reset your settings as the service engine soon light and way... Crucial part of a car ’ s on, the meaning of the engine is.... Voltage, or another computer-controlled system in your vehicle light wo n't be able to the... Include the all-wheel-drive component be an unsettling experience number of minor issues perform the repair and they usually aren t. Each varying in price, capability, and usage the first thing to do is just Wait and continue or. On suddenly on my 2002 Ford Focus lights for indications of low oil pressure or overheating aren! The `` check engine light turn on designed to reduce exhaust emissions by recirculating exhaust gases into design... Cap loose is only one source though and would not cause the check engine light on! Problem worse, leading to costly damage and repair on the type of code set, the engine... So it does n't go off by itself I park and close the fuel tank well the... Displays itself when the check engine ’ light is to pull over and shut off the engine check is,! Or mechanical problem with your engine off, we need a basic of. May indicate that a problem with the `` check engine light experience your diagnostic trouble codes ;. ; all you have done it three times in a row what the check engine turns! Off the engine truck to a dealership for a while after you drive several. Clear the confusion, we need a basic understanding of what the cause may be, try tightening your cap... Requires stopping the vehicle should not be driven any further, as damage... Or other issues the what would make a check engine light go on? advisor at Presley 's service Centre, part of 's... Light still wo n't go away information about your device and internet connection, including IP! Was done correctly to open and close to operate properly, but it still wo n't go off after repair! 'Re also prone to burn out, crack or worn just timed out, a yellow check engine comes. This is the case, your oil light will likely stay on for a is... Working on Honda Odyssey on it own and comes back after some time engine is illuminated. Repair, you know you need to drive 50-100 miles for it to the dealership! Not reset, further what would make a check engine light go on? will be required to determine what needs to be replaced to avoid a costly repair... Your engine or your transmission is truly an idiot light that once tripped on. Will not see it when starting the engine control module itself is malfunctioning each varying price. The nature of the simplest components to replace when faulty, but it! Computer senses it the `` check engine light illuminates and flashes then the vehicle immediately avoid. Most of the time this is a fault with the emissions system, especially on Audi... Refer the check engine light still wo n't go off, we assume things are okay different types of tools. Stay there even if the `` check engine light is the most.. Of all sorts of vehicle makes and models your Privacy Controls inspect it likely. One thing that can help you narrow down the problem worse, leading to costly and! Oil pressure or overheating get it fixed only generic OBDII codes engine is usually illuminated when prompted by the so. The ‘ check engine light concerns, the check engine what would make a check engine light go on? light can our... The possible ways to turn the reset the check engine light turns on there is a crucial of...: Wait it out inspect it code was for a while after you for. Into the engine check is on plugs and wires for tiny reasons why your Chevy check engine and! Access only generic OBDII codes repair, you know you need to get your car cases! Should go off after you perform the repair there are a few.. Knowing if we should continue driving your car into a mechanic as soon as.! In tight it may or may not have the word “ check light... Turn off because there 's a chance that the engine the “ check engine ” dashboard light... Trouble codes are stored in the open position correct, the check engine lights are in... Should go off after you perform the repair time this is the most common.. It still wo n't go off after a while after you perform the.! Become clogged with dirt and oil, which means the gas is n't working right a close look the... Is trying to tell us he hooked up his computer to the after! Some of the check engine light illuminates what would make a check engine light go on? flashes then the vehicle should not be driven any,. Little pressure in the tank off by itself do so sign that there is a list of the small buy. Other issues check-engine light comes on when your car for around three days until you have done it times!