write the code down. The Check Engine Light looks different in different car models. The gas cap has a rubber seal on it that pushes over the inlet to create a seal. Check to see if the check engine light reset. The light should then begin to flash and potentially beep before turning off. Finally, if those two steps don’t work, take your car to a mechanic or dealership to have it checked out. . The gas cap protects the gas tank from spills, evaporation, and contamination Dec 9, 2017 · Got a gas cap, dealer gave me one without a tether, said it was the same just no tether, one with tether has been on backorder for 2 months. Nov 11, 2023 · Just remove the ground cable on the battery for a couple seconds, that will reset the issue immediately. If the light doesn’t turn off after several trips, it might be time to replace Nov 2, 2022 · A faulty or damaged gas cap will also cause the check engine light to come on. Driving a few miles with the new fuel cap should turn off the warning light. However, if it is the gas cap a new OEM one will fix it. Turn on the ignition, and then check if the check engine light (CEL) is steady or flashing. Mar 13, 2024 · It is designed to create a tight seal on the fuel tank, preventing fuel vapors from escaping into the air. It’s easy to forget your gas cap when you’re filling the tank. Find the negative terminal on your battery. When this happens, the engine should be turned off immediately to prevent further damage. Feb 25, 2018 · Video tutorial on how I solved a p0457 gas cap code, along with a constant gas cap loose indicator light going on the dash. If your gas cap is loose or cracked, fumes may be escaping, causing your check engine to light up on your dash. For example, if the cause of your check engine light coming on was a loose gas cap, if it's tightened, the light will turn itself off. If your BMW’s check engine light comes on, there are several steps you can take to diagnose and potentially resolve the problem. Step 3. A steady light typically indicates a problem with the vehicle's computer system, such as a sensor that is not delivering or receiving the correct data needed. How to fix code P0457 and P1456. It is possible for the check engine light to come on in Altima due to a loose or bad gas cap. It can also be possible that there is an EVAP system leak or fault even though the check engine light is not on Mar 18, 2023 · After tightening your loose gas cap or replacing a damaged gas cap with a good one, you will need to drive for some miles (5 miles to 10 miles) before it resets. But a loose fuel cap certainly isn’t the only reason for the warning. This method does have a drawback, though. This will reset your check engine light. May 19, 2023 · 1. Modern vehicles require a tight cap to prevent harmful fuel vapors from escaping into the environment. Luckily, CEL caused by a loose gas cap is an easy fix and you don’t need to pay your mechanic a visit. It is also possible for an engine light to be turned on by a cracked or damaged gas cap. May 19, 2016 · This is a simple fix. Loosen the nut on the negative terminal with a wrench, then Apr 2, 2023 · A loose gas cap may be the reason for the check engine light to turn on. 2. Mar 21, 2024 · For this reason, it’s best to turn off the engine before you open the gas cap. As such, it’s best to deal with the problem directly. Jan 23, 2013 · And the check engine light & "gascap" warning lights were on. Does not require a mechanic to do really. When there is a failing in this system (including the gas cap) the check engine light will come on with an EVAP related code stuck in its memory (such as P0457 EVAP System Leak). Sep 18, 2023 · Can The Gas Cap Affect The Check Engine Light? Yes, a loose gas cap can cause the check engine light to come on. A cycle is when you start your car cold and drive it until it is warm and then switch off the engine and are done with your driving. Make sure the cap is sealing after you refuel and make sure the vehicle is turned off also. In many cases, a faulty gas cap or simply a loose gas cap can trigger your check engine light. Faulty Oxygen Sensor: The oxygen sensor measures the amount of oxygen in the exhaust gases and Jan 8, 2016 · An illuminated Check Engine Light is another symptom of a potential issue with the vehicle’s gas cap. 5L 4 Cyl. I did a lot of research trying to find out why they wouldn't turn off. 0L Dec 2, 2015 · The Check Engine Light may not turn off as soon as it passes, and it may not even turn off until a technician clears the code even though there is no repair required at all. 1. Low coolant level can cause problems too. GET THE REPLACEMNT PART HERE ( AMA If the check engine light is off, follow the steps below to reset the light: Find the OBD-II port under your Jeep’s dashboard or steering column. Jan 1, 2017 · It may be best to have a certified technician look into the gas cap fault. This is the button that you need to press in order to turn off the fuel cap light. Wait for 10–15 seconds. It is possible for the check engine light to come on in Cobalt due to a loose or bad gas cap. We invite you to Mar 25, 2024 · Loose fuel cap A loose fuel cap will allow air to enter your fuel tank. Turn on the automobile for about a second, then switch it off and wait for another brief moment. You can do this if the indicator is switching on for no reason, or if you’ve just had a tune-up and need to reset your indicator. For reference, the positive cap is red and will have a positive (+) symbol. The red positive (+) terminal will be close by. It may be necessary to run the “Drive Cycle” to clear the service engine light, depending on the fault. A loose or faulty fuel cap can result in unintended emissions, leading to the check engine light turning on. Release the latch and pop the hood of your car. In the event that it is loose, the fumes released will cause the check engine light to illuminate. If your vehicle still has a problem Oct 22, 2023 · Common Causes of a Check Engine Light. On some automobiles these issues set the P0440 code. Once the codes are gone, then the check engine light will disappear as well. If you are sure that you have fixed the problem causing the check engine light, the engine light will reset itself after 10-20 Jul 12, 2023 · Ensure the engine is cool. Dec 28, 2013 · You need to run the check on the truck. Driving around with a set P0457 code is not a good idea. Aug 2, 2023 · Solutions for BMW Check Engine Light. Usually, it has a black cap and a negative (–) symbol. Dec 14, 2016 · P-AC-04N Mounting Clamps for Truck Cap Camper Shell Toyota Tacoma/Tundra - 4 PCS. Put the cap back on. The EVAP systems job is to send the fuel vapor to the engine to be burned off. But there are a few ways you can manually turn off the check engine light. You can disconnect the positive (red) cable on the battery for about 3 min. If you need to replace the gas cap, they can be installed quickly and easily. It is possible for the check engine light to come on in Camaro due to a loose or bad gas cap. ” Technically, this is a Check Gas Cap light. For example, if the oil pressure dropped low for some reason, it could have triggered the Check Engine Light. Key Takeaways May 20, 2023 · 1. Loosen the nut on the negative terminal with a wrench, then pull the negative connector from the battery. Have not been able to get the codes read yet. It is possible for the check engine light to come on in Colorado due to a loose or bad gas cap. Dan Loose of Land Rover of Naperville demonstrates how to properly use the gas cap on Land Rovers to avoid the Check Engine light turning on. Loose battery terminals can cause the Check Engine light with 'low voltage' trouble codes. Whereas a steady check engine light may mean you merely need to tighten you gas cap next time you stop in order to reset the service engine soon Oct 11, 2022 · If there is a problem with the EVAP system, it could cause the gas cap light to come on. I guess with it being a common issue, step 1 unhook neg terminal on battery, step 2 open gas cap and close again, turning several times after it clicks, step 3 replace negative terminal and see if the light goes off, if not, then take it to autozone for a free diagnostic check. The code will pop up, then it will say done. Turn off the engine and tighten up that gas cap, then take it to a mechanic if the problem persists. This is actually one of the most common reasons why a check engine light is triggered. Repeat steps 1–3 two more times. Importance of addressing the issue: It is important to address the gas cap light issue as it could indicate a more significant problem with the fuel Your fuel economy will also take a hit. 4. Problem solved by replacing worn and deteriorating fuel pressure harness which is attached to the fuel pressure regulator. Once you’ve switched on/off your vehicle three times, your check engine light must go off by itself. So, you’re going to be turning the car on, then turning it off and back on three times in a row. Mar 4, 2015 · Step 1 – Examine the check engine light on the dash. A missing gas cap is the #1 cause of this warning light illuminating, and the fix is really simple. Apr 12, 2023 · GET FIXD 67% OFF. Get out of the car and look for the gas cap. 2013 Toyota Camry SE 2. Your ignition coils may be faulty, but the solution isn't a new set of spark plugs – it's actually a replacement ignition coil pack, which can solve all kinds of Toyota / By The GearShifters Team. Sep 29, 2009 · 13 posts · Joined 2003. 3. Replacing or tightening it may not immediately turn off the fuel cap warning. The best way to clear the check engine light is to pull the trouble code, identify and fix the issue and then drive your Q7 around until the module that threw the code recognizes that the problem is fixed. Simply tighten the gas cap correctly until it clicks 3-4 times. Turn on the ignition, then, press the red button on the scanner. Put on safety glasses and gloves, and park in an open, well-ventilated area. Thought it had something to do with gas cap as I had just filled up at a Citgo about 5 minutes before it came on. Drive your Odyssey for a couple of days. The battery replacement may also disrupt the electric flow to one or more sensors. When this happens the check engine light will turn off eventually. Push button to unlock the gas cap door, if your vehicle is equipped with a locking gas cap door. A loose gas cap is code 170, despite what the code interpreter says about a fuel system bank fault. This is usually located on the floorboard next to the driver side seat, or beneath the steering column. Intermittent Problem. If there is any abnormal wear or damage to it, even a new gas cap may not seal properly. If your blinker doesn't blink, or blinks rapidly, you likely have a burnt out bulb. It is possible for the check engine light to come on in Tacoma due to a loose or bad gas cap. Look for signs of wear, and examine your gas cap for damage. Feb 9, 2021 · Turn the car on. First, check your gas cap. Jul 25, 2020 · Check Engine Light Gas Cap and Small Evap Leak Fix. A loose cap can allow fuel vapors to escape, leading to an emissions system issue. Apr 16, 2024 · Loose Gas Cap and Check Engine Lights. This free video provides the steps to diagnose and clear a check engine light on a 2010 Hyundai Elantra GLS 2. The check engine light on the instrument panel should blink a few times after you replace the fuse and then turn off after a short period of time. This free video provides the steps to diagnose and clear a check engine light on a 2013 Toyota Camry SE 2. Try turning your car on one more time after tightening the cap and Apr 19, 2024 · As with the other issues, the sensors in your car will detect this problem. Here’s how to reset a check engine light manually: Turn off the ignition. When you tighten or replace your gas cap then the vacuum leak will go away. Start the vehicle after releasing the odometer button. Next, reset the check engine light using your car’s diagnostic system. To be technical, the dealership is 32 miles from where my parents live and the light is still on. Fix and Wait. Other issues can trigger the check engine light on a Fiat, such as: Oxygen sensor: Increases emissions and decreases fuel economy. Step 1. Use a small flathead screwdriver to pry off the light cover. Jul 2, 2020 · Check Engine Light– The fuel cap is part of the evaporative emissions control system. On the other hand, you can also use an OBD-II scanner to turn off the check engine light. He replaced the gas cap and the light shut off. Open the Odyssey’s fuel door. Likewise, if your catalytic converter is going functional, and you did a lot of stop-and-go driving, that may have turned on the check engine light due to the high usage of the converter. I took it to the dealer, they hooked up to the computer and ran a full check. Additionally, loose fuel caps can mean the gas in To do this, insert your key into the ignition, turn the vehicle on for about a second, and then off for about a second. Stayed on for over 100 miles. The fuel cap opener is usually found on the driver’s seat floorboard or under the steering wheel. Turn your key to position two after pressing and holding the trip meter reset button on the dashboard. Then connect the code reader to it. The oxygen sensor oversees the amount of oxygen in the exhaust gas. Dec 22, 2023 · The most common problems triggering Fiat check engine light are worn spark plugs or a loose gas cap. If that excess air makes it all the way to the engine, it can make it difficult for the spark plugs to ignite the fuel efficiently. Sometimes it can take a few drive cycles for your vehicle’s check engine light to shut down. Identify the negative battery terminal, which is usually marked by a black cap and a negative (–) symbol. Loose or Damaged Gas Cap: A loose or damaged gas cap is one of the most common reasons for the check engine light to illuminate. Rotate and pull to remove the spark plug wires, starting with the longest ones. It is possible for the check engine light to come on in Impala due to a loose or bad gas cap. You may opt to clean any visible signs of Mar 14, 2022 · The salesman had one of the mechanics check it out and they said the problem was the gas cap. Also, note the wire boot color or shape to know which ends go into the spark plug and cap. So they said it needed a new gas cap for the low, low price of $140!!!! I haven't called back yet to ask if this gas cap is made of platinum or simply 24k gold. Mar 24, 2023 · 1. Replace the front turn signal. Im going to order the Dorman leak detection pump, not a big deal. How Do I Turn My Check Engine Light Off? To turn off your check engine light after replacing the gas cap: 1. GM part #2450-6640. Common reasons for the Check Engine Light are: The gas cap was left loose when refuelling; Emissions-related sensors, such as oxygen sensors, have failed Feb 25, 2016 · Step 2 – Turn off engine. It is possible for the check engine light to come on in Highlander due to a loose or bad gas cap. Dec 27, 2021 · If removing and replacing the gas cap turned off the warning lights, do your happy dance and keep driving. Step 2. May 18, 2023 · 1. trouble code. If the gas cap seal is damaged or there’s a crack in the cap, fuel vapor can escape, leading to the warning message. Turn on the ignition without starting the Jeep’s engine and press the reset button for a few seconds. The repair usually requires the removal of an old one and the attachment of a new one. Gas Cap Code. Keep it to the side for 30 – 60 seconds. Apr 30, 2010 · For my gas cap replacement the two codes generated by the check engine light were: 143 Tank Leak Detect. Turn the ignition key to the “off” position. After the battery change, the computer resets and learns about this pre-existing issue. Loose Gas Cap. . Feb 17, 2022 · Leave the negative battery cable disconnected for about 30 seconds to ensure that all the stored power drains from your car’s computer. It might also take ten (10) to twenty (20) cycles to reset. 2010 Hyundai Elantra GLS 2. Jul 30, 2021 · Where to Get a New Gas Cap to Clear the P0457Code. Remove the negative battery terminal (black cord) from your car battery and keep it off for approximately two minutes. It is possible for the check engine light to come on in Suburban due to a loose or bad gas cap. May 1, 2024 · Check your gas cap as soon as it’s safe to do so. May 1, 2024 · Take hold of your gas cap and twist it. May 20, 2023 · 1. Now, turn the new gas cap clockwise to screw it tightly in place, until you hear that solid “click”. A cycle is defined as the period between when a car is switched on and when it is turned off. An improperly sealing fuel cap may cause an evap system leak, which will set off the Check Engine Light when the May 20, 2023 · 1. On the other hand, a flashing light Mar 18, 2024 · Retightening a loose gas cap or replacing a missing or broken gas cap is the simplest way to reset the Honda check fuel cap. Aug 12, 2022 · The Dodge Ram gas cap light is a warning indicator that appears on the dashboard when there is an issue with the vehicle’s fuel system. 62 CDN Pulled into our regular more than friendly Toyota dealer who scanned my BMW for free then within a minute diagnosed the leak problem described above for free. Teeran Android Auto Wireless Adapter for OEM Factory Wired Android Auto Cars Plug & Play Easy Setup Wireless Android Auto Dongle for Android Phones Converts Wired Android Auto to Wireless (Black) $69. Get a wrench and loosen the nut on your negative terminal. Make sure the gas cap is properly secured. I finally came across to reset the engine computer and this worked to turn off the engine lights: Steps to Reset Check Engine Light Feb 28, 2022 · Usually, the check engine light goes off automatically once the problem is fixed. Reconnect the negative cable, and use a wrench to tighten it back up. It typically resembles a gas pump or a check engine light. Sep 15, 2010 · 2000 Buick LeSabre 147,000 mi, panamax. To finish the reset; In order to access the gasoline cap, turn off the engine. Perform this procedure 3 times more. How to Fix a check engine light that ca Follow these steps to learn how to reset a check engine light: Turn off the ignition and put on safety glasses and gloves. While the only symptoms are an illuminated check engine light and the smell of fuel, they could be precursors to other issues. Another way to reset your check engine light is to do a hard May 20, 2023 · The flashing light often indicates a misfire, which can cause damage to the catalytic converter. Visually check if the battery terminals are tight and not too corroded (see the photo ). A set of errors will display, write down these trouble codes, and keep them safe. Locate the negative terminal, with a black cap and a negative (-) symbol. Jul 19, 2023 · 1. First, check to make sure the valve is properly installed and connected. It's possible that the warning light won't come back on after you clear the Jun 16, 2018 · GasCap/Check Engine Light - Solved Jump to Latest Follow 12K views 4 replies 5 participants last post by Jay2011JK Aug 16, 2020 Jul 20, 2023 · 1. The great news is that most check engine lights don’t actually mean “engine,” but rather, they mean, “Hey, the gas cap isn’t holding a vacuum. Raw fuel smell – If you notice a strong smell of gasoline around your car, especially near the fuel filler area, it could be May 19, 2023 · 1. Some gas caps may have a tether to remove as well. Locate the negative terminal. Loose or bad gas cap. Mar 21, 2024 · If you have a loose gas cap, it sends out an alert to the computer, causing the Check Engine Light to come on. Once the cap is replaced then the Check Engine Light will need to be turned off. Turn on the car’s engine. Oct 1, 2022 · 1. Then reconnect the negative cable. The rubber seal on the cap looked pretty dry and worn, so better to clean and apply a bit of grease to soften it up. If the check engine light comes on again, though, you’ll Feb 23, 2023 · Remove the old gas cap, and grab the replacement unit. Put it aside for a minute. Check Your Gas Cap. $29. It is possible for the check engine light to come on in Xterra due to a loose or bad gas cap. Burnt out brake lights increase your chance of getting rear ended - check and change yours today. May 13, 2022 · Some check-engine light warnings are temporary—like the aforementioned loose fuel-filler cap or a rare engine misfire. Approximately 10 or 20 miles after returning to the road, your check engine light should turn off. May 20, 2023 · The flashing light often indicates a misfire, which can cause damage to the catalytic converter. If the rubber o-ring on the gas cap is damaged, replace it with a new cap. 14 people found this helpful. Then I also had a "check engine" light come on in my 1994 Chevy. You can disconnect the battery and turn off the check engine light easily. May 21, 2023 · 1. Apr 29, 2022 · How to Fix a Gas Cap Throwing a Check Engine Light. The gas cap is a part of the vehicle’s evaporative emissions system and can cause problems with the system if it has an issue. Check if you have enough oil in the engine ( see how to check the oil level ). If the gas cap is loose, damaged, or missing, it can cause the check engine light to turn on. Use the OBD RESET button to turn off the Check Engine light. To determine whether the cap is to blame, you (or your mechanic) will need to do some detective work. Just to be absolutely sure that it’s solidly in place, keep screwing it until you hear 3 clicks. Faulty Sensors. Luckily, there’s a common issue that causes check engine lights to turn on. Repeat this two more times then drive the car as normal. Then, wait for somebody to figure out why this keeps happening. Disconnect the positive lead on the battery to reset the gas cap light. May 1, 2007 · They cost $50 - $100, or more. Service vehicle soon light on and message said check for loose gas cap. If you see a check engine light after getting gas, the likely culprit is a loose or faulty gas cap. Issues can range from anything minor, such as a loose gas cap, to problems that are more severe, such as a failing sensor. Hold the odometer button down for a further ten seconds. The fuel cap, along with a series of lines inside of the gas tank, makes up a system that recirculates gasoline vapors and keeps them from escaping into the surrounding area. Disconnect and Reconnect the Battery. The gas cap might not be properly tightened, causing the check engine light to turn on. Loose Or Damaged Gas Cap. I also want to talk more about the evaporation emissions system. See all videos for the 2010 Hyundai Elantra. Just put the gas cap back and off you go. Most people would think that it is the fact that the gas cap is loose that makes the CEL come on, but it isn't. Fuel Cap. Replace the fuel cap. EVAP: The EVAP emissions canister can fail, triggering CEL and codes such as P0499. The positive cap will be red with a positive (+) symbol. It is possible for the check engine light to come on in Wrangler due to a loose or bad gas cap. Mar 3, 2023 · A car usually needs 10-20 successful cycles before it resets the check engine light. On inspection, the Jeep Grand Cherokee Check Fuel Cap light is $95, which includes $9 for parts, $9 for labor, and $95 for each part. Bought a 2010 DC 2 weeks ago, 560 miles as of tonight, and check engine light came on. It’s possible that there was a problem, but you didn’t notice it because it didn’t last. If you’ve tightened up the gas cap after seeing the alert, the warning light could reset on its own after a diagnostic check. Nov 6, 2022 · Locate the fuel cap light on your Jeep Cherokee. $5. Once your engine is off, go ahead and hop out of your Camaro. Feb 12, 2023 · The Check Engine Light indicates that the vehicle’s computer has recognized a fault that needs to be repaired. The 2014 Toyota Camry’s check engine or maintenance light is an Mar 21, 2024 · Let’s examine the most common reasons for this Honda warning. Close the fuel filler door, and crank the engine. #10 · May 30, 2007. The check engine light will come on and set a code if the fuel system isn’t sealed airtight. Ensure it’s properly tightened and not damaged. The gas cap creates a seal that allows gas vapors to remain in the overfill tube and evaporator, and if the gas cap isn't locked properly, the fumes will escape and the system will detect a "leak," therefore making the CEL turn on. The video also provides steps on how to read the 2013 Toyota Camry SE 2. Jan 30, 2022 · A loose fuel cap could affect your vehicle's emissions. This happened to a friend of mine: The "check engine" light came on in his truck (Toyota). Turn the car on. The cap sometimes does not reseal after refueling causing the system to detect a leak. If it is off, the reset was successful. Jul 29, 2020 · It should be replaced if it is damaged, loose, or not properly sealed. Faulty Oxygen Sensor. Major Leak 00250 undetermined code new gas cap from BMW dealer $32. Check amazon for there stock cap. #22 · Oct 16, 2009. If this is the case, a new gas cap will fix the issue, or Feb 14, 2023 · Replaced with new gas cap. This will clear the trouble codes from the computer. If you have a flashing check engine light, turn off the engine immediately to prevent potential motor damage. Turn off your vehicle's engine. Scion. Turn the truck off, then turn the key to the on postition (do not start the truck) and back to off three times. To reset check engine light with a code reader; Locate your onboard diagnostic connector underneath your car’s steering. On the third time, hold it to the on position, the truck should chime, and then look at the odometer. Apr 7, 2021 · Yes, a loose gas cap can turn on the check engine light (CEL), primarily on vehicles built after 1996. It should have a black cap with a negative (–) symbol. 0L 4 Cyl. They replaced it with a new one before my parents bought it and the salesman told them that the light should go off after about 30 miles. 98. A warning like this can often be resolved by tightening the gas cap. Small Evap Leak Detected Fix. Put the key in the ignition and start the 2014 Toyota Camry to turn off the check engine light. You’re probably all set. Did not cure my gas cap message, and now have a check engine light as well. Once the cover is off, you will see a small black button. Go buy a relatively inexpensive code reader that will reset the check engine light when it happens. A bad ignition coil. Turn off your engine, if it's not already. 84 + shipping. This is because a loose gas cap can allow fuel vapors to escape from the fuel system, which can cause the vehicle to fail an emissions test. Then pull the negative connector off of the battery. The next day, the engine light was still on and the gas cap light came on. It will Turn on the ignition without starting the engine. 99. If the cap is cracked or damaged, replace it with a new one. Depending on where you are, prices may vary. Fix #2: Clean and grease the gas cap’s seal (Cap was leaking, but maybe just slightly. Check to see if the “Check Engine” light is illuminated on the dash. Apr 16, 2021 · The most common reason that a check engine light turns on is for a vacuum leak, typically that is caused by a loose gas cap or a gas cap with a failed gasket on it. If you have a bad gas cap, symptoms can be wide-ranging, including: Check Engine Light – A broken or loose gas cap can trigger the Check Engine Light to come on, as it affects the evap emissions system’s pressure. The fuel system in modern vehicles is designed to maintain a certain level of pressure, and if the gas cap is not sealing properly, it can cause a leak and disrupt the pressure balance in the system. Jun 4, 2024 · Gas Cap. I did top off about 30 cents, but surely a splash of gas wouldn't do this. It is possible for the check engine light to come on in EcoSport due to a loose or bad gas cap. There’s also a possibility you have a bad fuel tank pressure sensor. Make sure your gas cap is in good condition. Jun 21, 2024 · 1) Missing Gas Cap. Now shut off the engine and check the warning light. Oct 12, 2015 · Step 1 – Tighten gas cap. It is usually located near the fuel gauge on the instrument panel. A faulty oxygen sensor can send inaccurate readings to the engine computer, causing the check engine light to activate. Twist the fuel cap to the left until it disengages from the fuel fill nozzle. Rare but one possibility can be damage to the fuel filler neck itself. A "replacement" cap made in China will work about a year and you will then have the same issue again. It may take some time for the alarm to clear if you just drive because the OBD computer A check engine light can indicate a broad spectrum of problems with your 2002 Lexus SC430. When it does, it reports it as a check fuel cap message. Compare the sizes of all the wires not to confuse them and their position. A loose gas cap can turn on the check engine light (CEL), primarily 1. Turn the car off. Another easy way to reset a check engine light is to switch the vehicle on and off at least three times. May 6, 2007 · 38 posts · Joined 2007. This can trick your vehicle’s central computer into detecting engine errors that cause the check engine light to start flashing. Fix #1: Tighten the gas cap. On the fourth time, start the engine and let it run for 30-35 seconds. If the gas cap is stuck, get a large open end wrench and put it on the gas cap knob to give yourself some leverage and twist the gas cap open. mj rm fe rq fh ov vy vw ro wx