Kate is a research study enthusiast through a Bachelor of Science degree from Sonoma State University. Kate has a passion for the automotive area.

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Why Is My "Check Engine" Light On?

You've solved the problem that made your "inspect engine" light revolve on, yet currently it won't turn off! This might not be your fault. Sometimes the computer in your auto will certainly require a little assist to watch that the concern has been refixed. I'll go over a few techniques for reestablishing your inspect engine light.

This light display screens itself when the onboard computer mechanism recognizes an electric or mechanical problem with your vehicle. When the trouble is solved, the engine light does not always turn off. This have the right to be annoying, reason you to fail an emissions (smog) test, or keep you from finding out around future troubles the vehicle's computer can be trying to alert you to.

Of course, it is necessary to be certain that the light isn't on because your engine really does still have a trouble. Try one (or more) of the following philosophies to rotate the light off. If it does not go off, then your engine has actually a problem.

MethodTools Required

1. Drive your automobile and also let light go off by itself.


2. Turn the engine on and off 3 times in a row.


3. Disaffix and reattach the battery.


4. Use an OBD code reader.

Wrench and also OBD reader

1. Drive Your Car and also Let the Light Go Off by Itself

The first and also easiest strategy for clearing the inspect engine light is driving and time. Many onboard computer systems will certainly reinspect whatever problem resulted in the examine engine light to activate multiple times. Drive your car as you typically would.

If the examine engine light is still on after three days, your difficulty might not have actually been fixed or you might have to attempt some of the approaches below to reset it.

2. Turn the Car On and also Off Three Times

Some vehicles will automatically recollection the trouble codes that resulted in the initial error after the auto is turned on and off 3 times in succession. To perform this, insert your key into the ignition, turn the auto on for about a second, and also then off for around a second. Repeat this two more times then drive the auto as normal. Check to view if the inspect engine light recollection.

3. Disattach and also Reattach the Battery

You will require a wrench. Prop open up the hood and use the wrench to disconnect the positive power cable to the vehicle battery. Leave the battery disassociated for at leastern 15 minutes. Then put your essential into the ignition and also revolve it 3 times to the “ON” place. This will clear the egoals data from the vehicle memory and also the readiness flag data.

Reconnect the positive battery cable and also revolve the crucial in the auto ignition. Wait one minute and the check engine light error should be gone.

4. Use an OBD Code Reader

You will certainly need a wrench and also an OBD (onboard diagnostic) reader. These inexpensive readers analyze and clear engine codes. I have actually used the Kobra OBD scanner via good success many kind of times for this task.

To perdevelop this method:

Plug the reader right into the OBD port of your automobile. This port is usually located on the underside of the dash location just over the foot well. On some vehicles, you'll need to remove the door on your fuse box to accessibility this port.Once you have associated the reader, push the "enter" button to revolve it on.The tool will certainly scan your engine for any error codes. Once done analyzing, the reader will certainly display screen any kind of error codes it finds. Make note of the codes (if any) if you wish to cross examine them in the code reader's hands-on or digital.Now you can press the "scroll" button to uncover the alternative to erase the code. Press enter while on this option to erase the fault code and also recollection the check engine light.


Frequently Asked Questions

Here are just a handful of commonly asked inquiries concerned this issue.

Can the inspect engine light turn off by itself?

Yes, occasionally the light will certainly rotate off by itself as you drive it roughly for a while after addressing the problem that made it turn on in the initially area.

Why does my check engine light revolve on and off intermittently?

Tright here might be a few reasons why this is happening. A loose gas cap, failing engine sensors, bad spark plugs, faulty valves such as in the EGR (exhaust gas recirculation) system, or intermittent misfiring could all be potential culprits. In this case, it's regularly ideal to take your vehicle into a mechanic shop to acquire a diagnostic, or at the incredibly least usage an OBD reader yourself.

Does the examine engine light turn off automatically after repair?

Sometimes yes and also other times no. If the worry has been repaired and also the computer system has been cleared via a shave the right to tool or code reader, then the light present revolve off fairly soon after.

That's not constantly the instance though, and the light may still stay on (or turn on and off intermittently)—especially if you have actually a bigger electric or wiring problem.

If you acquired your auto repaired at a mechanic shop and the worry appears to be readdressed yet the light stays on, however, then you have to take it ago to the shop and also ask the mechanic if they deserve to recollection the light.

Do I need a special tool to rotate off my examine engine light?

Yes. If you desire to revolve off your inspect engine light yourself, then you will require an OBD code reader. It plugs into the diagnostic port frequently situated under the dashboard in cars made in 1996 or after. These tools deserve to be purchased at miscellaneous automotive parts stores or online at miscellaneous retailers such as Amazon.

Be advised, however, that if you usage an OBD reader to clear the code however the worry has actually not actually been reresolved, then the check engine light will certainly likely rotate back on aacquire at some time quickly after that.

These Techniques Should Help You Recollection Your Check Engine Light

Following these methods will certainly enable you to rid the annoying inspect engine light as well as allow for brand-new troubles to be displayed properly.

Whether you select to manually recollection the onboard computer by resetting the battery or by utilizing an OBD reader, you will certainly be able to effectively solve the error. You may use these techniques to settle the examine engine light error as well as any various other errors later on should they present themselves.

This write-up is specific and also true to the ideal of the author’s expertise. Content is for informational or entertainment objectives only and does not substitute for personal counsel or experienced advice in business, financial, legal, or technical matters.

Questions & Answers

Question: Can I get rid of the "examine engine" light without an onboard diagnostic reader?

Answer: You absolutely deserve to, yet it may be more hard. I would certainly begin by trying the other approaches outlined in this write-up. If those don't job-related, then tright here is likely something mechanically wrong through the auto.

It deserve to be as basic as replacing a simple to reach $10 sensor that has actually gone negative, or a lot even more hard. While some skilled mechanics can troubleshoot their vehicle and also situate the concern without the assistance of an OBD reader, a lot of civilization (such as myself) need a code reader to make points simpler for us.

A code reader deserve to help you by manually allowing you to clear the fault code that has caused the examine engine light to illuminate (in case it was stuck on because of an error in the car's computer), or if tbelow truly is something mechanically wrong then it can give you the "error code" that your automobile is developing.

This error code is the actual reason the inspect engine light has actually been caused. You have the right to then look up this error code in the reader's hands-on or digital and see what the worry is via your car in ordinary English. It is a handy tool that also the majority of experienced mechanics rather greatly count on these days.

Question: Why did my inspect engine light come on after I reput some fuses?

Answer: Likely one of these instances occurred:

1. You reput a fusage via a fuse of an incorrect worth. Double check that you offered the correct kind of fuse per the vehicle's manual.

2. One of the fprovides you put is poor or conveniently went bad after installation, bring about among the systems in your automobile to soptimal working effectively.

3. You reinserted a poor fusage, leading to a system in your auto that was not functioning formerly to start functioning. That device has an worry leading to your car to screen the examine engine light. This is much less likely if the check engine light wasn't on before this.

4. It's a coincidence and another mechanism in your vehicle started to suffer an concern simply after you reinserted the fusage. Believe it or not, this does happen also though it is also much less most likely.

The most basic way to narrowhead down the trouble is to use an OBD 2 reader, such as the one I connected to in the article, to review the trouble codes from your car's computer. You deserve to then cross referral this code digital or via the hands-on that comes via the reader to find out specifically which system is resulting in your car's examine engine light to illuminate.

Question: I reput my vehicle's O2 sensor, disassociated and reconnected the battery multiple times, and also adjusted its plugs, yet the examine engine light came ago on after a 45 km drive. What need to I perform next?

Answer: If your vehicle is 1996 or more recent version, you must connect its computer to an OBD2 reader to discover out what error code it's generating.

Once you acquire this code, you'll have the ability to interpret it and also get a much better understanding of what is wrong with your car.

If it claims it is "out of range," which is extremely widespread when a sensor malfunctions, relocation the faulty sensor. Then take the measures outlined in this write-up to recollection the examine engine light.

© 2012 Kate Daily


Joseph Mwai on June 27, 2020:

Shailesh on June 25, 2020:

The problem is this - as soon as you reset the light either by making use of a scanner or disconnecting the battery, the obd monitotrs obtain recollection and present as infinish. While all the monitors present prepared after driving the vehicle a few miles, the catalyst monitor does not. When it does become ready, the light is ago on. So I cannot obtain the auto to pass the smog test. Thoughts? I have a 2000 Honda CR-V.

Bethany H on June 19, 2020:

I tried #3 on my 2007 Nissan xterra. It worked like a cdamage. Thank you!!

Jerry Abbott on June 12, 2020:

My Sister had actually a Lincoln her light came On--they knowed this ford Manchinic --excellent friends --He came out and addressed the Problem---He told her--offer me around 20 minute and also Your Check Engine light will certainly never come on again --and also Your Car will certainly pass Inspection --Your On Board Computer will not Relize the check engine light is On and also it won't show on The Dash Board---==she drove around 5 even more years and also it never came on again--and it Passed inspection eexceptionally Year after that what did He Do

Fred Reed on June 07, 2020:

I have a 2007 Chrysler PT Cruiser which the code reader indicating P0700 as default to the transmission what would certainly be the solution to this problem

Holly on May 29, 2020:

I have a 2014 Dodge Charger. The 2 fuel pumps were reinserted. Engine light is on. When checked it claims it's the fuel pumps however they've been replaced and also car runs. Assistance please.

Mike on March 05, 2020:

My toyota obd has actually no power,all foffers are ok.what the H is wrong? I have actually tuck battery affix off,but 3 dsys its ago on.

George Sinese on February 24, 2020:

Thank you, Kate,,,,, incredibly useful !

Genine on February 23, 2020:

My examine engine light came on and also it verified that it was the thermostat. I had it fixed and also the light is still on my 2010 nissan altima. I have a push start button.

Jim Stiver on January 26, 2020:

I tried #3 and it worked on my 2012 Dodge Caravan...Thanks...Jim

Sandra on January 26, 2020:

Do you reattach the battery vable then revolve the essential to on position 3 times or befor you reconnect

Rick on January 18, 2020:

I removed active shutter grill. Do you recommfinish a scanner that can disable code, po59f. I can clear it, need to disable.

TonyB47 on January 11, 2020:

I reput both and so on sensors and also engine still runs sluggish after heat up and eats alot of gas. It is a 98 suberban. What else could it be?

DANIEL HAYES on January 09, 2020:

Have a 2010 Ford Explorer,have actually 7 codes all pertaining to eobjectives, prefer o2 sensor , egr valve , map sensor etc... adjusted all components yet still having examine engine still on ?? And vehicle shuts off as soon as quit at light or when many stop & go traffic

hector on October 21, 2019:

a 2001 toyota corolla the inspect engine light is on. i erase it and also i can drive it as a lot as i desire to and it won't turn on till i turn off the auto and rotate it earlier on in a few minutes the light transforms on.

Thabana on October 16, 2019:

I want to uncover out what the trouble might be if my automobile inspect engine light turns it self on and off. the light turned it self on Friday and also I plugged in my obd2 scanner which offered me trouble codes P0101 and P0420 and also I was planning to take it to the mechanic on the following Friday and also now it Wednesday afternoon, as soon as I inspect the light is off by it self and also without having addressed the difficulty.

Mike on September 17, 2019:

I have a Ford Focus SE 2007. I just had a auto mechanic just relocation the fuse for my dash. And the minute I turned the engine over. When I acquired it back. The check engine light came on. I know every little thing checks out fine. Example: the OD I code is reset. I had actually the engine solved so it deserve to pass The smog. They even provided it a complete diagnostic. The first time roughly. Gave it a lube and oil change. Found out it was a valve stuck open for emissions mechanism. Can I still drive?. My mom says she going out of the country on the 18th of this month. Sorry, I don’t sleep well when a examine engine light is on.

Atiq on July 29, 2019:

I hv acquired honda accord 2003, check engine light is on. I checked with code reader it gave me knock sensor error. I reput the knock sensor yet the examine engine light is still on. What shall i do?

hotmail.com on July 03, 2019:

2007 honda public si 2.0 liter ..ok my story goes like this my second fan was not functioning ,so my air conditioning was heat and cold . so while my engine was running I made a decision to pull my relays out all sudden I pulled this relay and also the vehicle sounded choose it had actually a hole in muffler prefer it shed power so I get in it and all these lights came on put the relay ago in and also shut it off , so all lights once of and the examine engine light was still on.acquired my obd machine erased examine engine light ..light didi not come ago on after driving it . but on the fifth day went back through the obd reader and also it has a yellow light..instead of a green . code reads as follows p1659 and it states #1tacm relay stuck off #2etcs regulate relay malfeature .. car runs excellent but please aid me I need to get this automobile inspected . and also tbelow was nothing wrong through this auto until I pulled that relay out while my engine was running .

Valentino olape on June 21, 2019:

My 2000 volvo v40 how to gain back i deleted the engine light on& code.

Clifford on June 04, 2019:

My ford emphasis ecoboost mirrors the yellow engine light however simply gone to a service. Ho should I recollection it. It make some funny sound on the desh board don't understand if it have a faulty

Bianca on May 20, 2019:

I have a 2005 acura tl just gained out of the shop for a transmission rudevelop and now inspect engine light is on reading a code of p0741

Andy Rodeheaver on May 04, 2019:

exactly how to eliminate engine light, had actually checked they said to google this number P0743

Eugene M Gershunov on May 02, 2019:

I cannot pass the smog examine bereason the second air injection ports are plugged with carbon deposits. What execute you recommend to do to clean the ports without bringing the auto to a device shop? That is very expensive. I turned off the check-engine light and complied with your referrals from "Tips and tricks ...". and also melted 2 tanks of gas (even more than 500 miles) yet the AIR examine on OBD is still red. Please aid.

I would start by contacting the garage (or looking at your paperwork) and acquiring make and also component number of the alternator and also starter they set up. Then double examine that those items are compatible with your auto. I have never before heard of a starter leading to the light but the wrong alternator sure can!

louise sara mc menamin on March 23, 2019:

i had my auto in the garage and acquired the starter and also alternator reput...when i put diesel in the engine, the engine administration light came on..obviously i understand theres nothing wrong via the vehicle..exactly how carry out i get this off...Ford Focus 2010

Al Ong on March 03, 2019:

I tried to turn the Car on and off Three Times yet the inspect engine light won't go amethod. My automobile is Honda Odyssey (2011), is the approach (approach 2 per instruction) functioning on Honda Odyssey?

faraz on January 17, 2019:

swift 2015 exactly how to inspect engine light rerelocate at some point indicate

Seanbike on December 04, 2018:

This indevelopment has been incredibly helpcomplete. Thanks

Debbie Pemental on October 22, 2018:

If disconnect my battery and also reattach it and the engine light goes off will it pass inspection

Lee on August 04, 2018:

As for step 2 above: Do you actually have to begin the vehicle for a second, then revolve off for 1 second - 3 times, OR perform you just turn the ignition crucial to the ON position for 1 second then back to the OFF place for 1 second - 3 times.? Thanks a lot. I am having this problem for 5 years now, and also replacing the same item O2 Sensor, yearly, I need to display proof of a $200,- repair bill every year just to have the ability to acquire a Egoals waiver from the State Police to be allowed to renew my tags in my county in the state of NC. It is a hassle.

James wilson on July 28, 2018:

My bmw 320i has a fault code analysis nox sensor heating ihave the right to put it off via my disgnostic machine and also drive for miles but when i speak the automobile and begin to drive aobtain it comes back on please help

Joel on June 26, 2018:

Hello, my 2009 A4 engine light proceeds to come on. My mechanic has actually reregarded it and also ran tests on it and also cannot find anything wrong via my vehicle, even though the engine light is on. Any suggestions on what to perform or maybe what it can be?

Theo on May 17, 2018:

Google the OBD code, tright here all in there !

waylon on April 17, 2018:

I have actually a 97 audi a4 1.8t and the check engine oil level andinspect engine light is on and it won't shift in reverse or drive just how do I settle it

Kate Daily (author) from California on January 08, 2018:

No, problem! Good luck, let us understand exactly how it goes!

bryan on January 07, 2018:

Thanks a lot Kate...i now have actually an idea of just how to get rid of my problem!... for my Ford Focus 2008 model!

Adrian F. Good on December 26, 2017:

Credible suggestions. I'll try the initially three and also if they don't solve it, I'll take it to my auto mechanic and also ask him to usage his OBD code reader. What a pain in the neck it is to install a new battery in a late model automobile. Thanks for your advice, Kate Daily.

A loose or damaged gas cap is actually a pretty common factor that a check engine light will come on. Your car's computer more than likely just essential a little aid after you addressed the worry. You did the right thing!

Yes, as lengthy as your check engine light remains off throughout the smog test, you should be fine. Take a look at my various other write-up (below) which may be useful to make specific your vehicle passes smog. Good luck!


Penny Lister on December 11, 2017:

my examine engine light was remaining on so I reinserted the gas cap, yet the light was still on, so I took the ground cable loose from my battery, pressed the horn for 30 seconds, and also i waited for 15 minutes to reconnect the cable to the battery. Once i did that, my examine engine light is currently off. I have pushed the car approximately 30 miles since then and it is still off. Do you think I have actually solved the problem and also execute you think i deserve to currently pass emmissions?

Kate Daily (author) from The golden state on December 07, 2017:


There could just be a couple of reasons why the inspect engine light would remajor. These are in order from the most likely reason to the leastern likely:

Possibility 1 - The trouble that caused the computer's error code (which is making the check engine light illuminate) was not fully fixed. Even if you reinserted the sensor, it might not have truly been a faulty sensor that is the concern. It may have actually been what that sensor is detecting (i.e. a bigger problem with the engine).

Possibility 2 - Tbelow is an issue with the connection to the sensor. I understand you checked for loose connections, yet did you inspect the wiring from the computer system to the sensor itself? Try doing this by utilizing an ohm meter to obtain a reading on the resistance across just the sensor, then affix the sensor and find the same sensor wires ago at the car's computer system. Test the resistance in between those 2 wires back at the car's computer system. They should be just around the very same resistance. If the resistance is significantly better or lower than what the resistance was throughout just the sensor by itself, then you have actually an worry through the wiring and/or link to the sensor.

Possibility 3 - The car's computer is faulty, this is by far the least common. See items 1 and also 2 above initially.

I hope this gives you an excellent founding allude. If you would certainly favor, short article what certain error code your car's computer is offering you (read the codes via the OBD 2 reader) and I have the right to offer you even more concepts on wright here to look.

Rick dreves on December 07, 2017:

What if you've done all these steps and your inspect engine light is still on replaced all O2 sensors map sensor inspect for all loose connections and an excellent ground however the engine light still on and still offers the same code that you just repaired

Kate Daily (author) from The golden state on October 08, 2017:

Hi Paul, I would certainly certainly begin by canceling the fault code to check out if the code comes ago. If it does then it might not have been the sensor itself that's the problem, rather it might be what the sensor is detecting. Here are some thoughts that might be helpful:

1 - Check for loose or corroded electrical relationships in the wiring harness close to the sensor.

2 - Are tright here any various other electric associated worries via the car? If so they could be related (prefer a loose or corroded grounding wire).

3 - Check the vacuum system (i.e. vacuum hoses and also connectors) for any kind of shed or brittle/damaged parts. If you have actually a tiny vacuum hose via a crack in it, it can reason your fault. Try making use of a vacuum gauge for chasing dvery own any concerns with the vacuum mechanism.

Hopefully you discover some of this beneficial for fixing your problem!

Paul Luckhurst on October 08, 2017:

Had no acceleration,fault code P0105 map sensor. I have actually reput the Sensor,however still have actually acceleration problem (but not as bad) ? If i cancel fault code, will it clear, and recollection engine ago to normal operating mode

Krissy chestnut on April 19, 2017:

I have actually a 2005 Chevy Cobalt and also my inspect engine light came on . So I hooked the scanner up to my vehicle and also it sassist for me to recollection the inspect engine light. So I did and a few days later the check engine light came back on and also it's still saying I must reset the check engine light. Also the light goes off and then will come earlier on. PLease help!!! I'm at my wits finish.

betty graske on April 11, 2017:

I have a 2001 toyota highlander and also the engine light was on. I took it to my mechanic and he shelp he repaired the trouble. Went dvery own the road 2 miles and it came earlier on. Took it back to him and 3 days later he shelp it was done. Went down the road and the gas gauge was not working. Took it back aobtain and he shelp the wire damaged off. I have actually factor to think he disassociated my engine inspect light. How perform i have actually that checked without spending more money.

Levi on January 28, 2017:

Good day i have actually a mitsubishi lancer 4g92. I saw two various diagnostic. Both told me their scanner isnt picking up any kind of difficulties. The vehicle cranks yet wont turn over. I adjusted plugs however im not gaining any kind of spark. I changed video camera and also crank sensor. None of this has actually functioned. The check light is coming on as usual then it will go off as usual. Even via the engine light on im still not gaining any analysis. What is this problem i am facing? Assistance.

joeblevins on December 31, 2016:

Wow...unbelievable...after fixxing the oxygen sensor on my Ford Explorer XLS to acquire it to pass the emissions test the inspect engine light turned bk. On...couldnt think it, so I assumed i more than likely had actually to go back to the shop for even more examicountry yet thanx to this webwebsite i followed the easy procedures to recollection it myself... And sure sufficient i unplugged the pos. Cable as defined and follow the staying measures before reattaching the cable bk on and to my amaze it WORKED!!!!... WooHoo!!!!!!....Thanx for the beneficial information to help resolve the difficulty...2 THUMBS UP!!!!!!!!....

joeblevins on December 31, 2016:

Wow I cant believe after i gained my oxgyen sensor addressed on my 2001 Ford Explorer XLS came bk on after having actually it resolved to pass Illinois Emission Test that this details i review on line wit u guys functioned 100% plus ...I complied with all actions gave and also the one that got rid of the examine engine light was unplug the pos. battery terminal and inserting the essential before re-attaching the cable bk... I believed i would certainly need to take it bk to the shop for even more examicountry But dont need too...Thanx for the information. On just how to reset the problem myself...2 thumbs up for this website....

Evans on November 25, 2016:

I followed the hand-operated method the light off momentarily and also then came back on! Mine is a 2009 mazda bongo van. The irritating light is still on.

Stephanie on October 09, 2016:

I reseted my engine light however now prior to I foolly turn on the car it still turns on

BIG ED!!! on September 03, 2016:

Wooohooo. Left my dome light on, which killed the battery in my Subaru Forester. Turned the car on multiple times as indicated above and it reset the check engine light, hill descent and tractivity control lights and also the automobile is earlier to normal. Thanks

John on August 13, 2016:

Thanks so much!! I found various other sites that advised to disattach the battery, however yours was the only one that advised to put the auto in the "on" position 3 times before connecting the battery aobtain. This seems to have actually done the trick. The light is no longer on.

ben thuku on August 05, 2016:

my prando examine engine mirrors as soon as the automobile inclines .

what is the problem?

Your Name on November 28, 2015:

help my toyota probox,,as soon as i drive 5okms,the engine gets really warm and anywhere sudden it switches off while on motion.when cool it takes off for a short distance and then reflecting check engine then it goes off!whats the issue?

felicia on April 22, 2015:

Aid, my Honda fit 2007 is acting up! When I was driving on the highway yesterday the engine light rotate on , likewise while accelarating the car was not increasing to par. I visited take it to auto zone and also they did a diagnostic test bit machine that looks favor a phone and also it said that the oil press was low and so on and so on. What does that mean. I checked my motor oil and also its fine. Is it expensive to fix? Please assist me.

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Ana Maria Orantes from Miami Florida on April 08, 2014:

Thank you for the indevelopment Mr. Wolfy. It is true about what you are saying. I had actually the same problem through the light. And some one did all that work-related. The light is no longer on.