Kate is a research study enthusiast with a Bachelor the Science level from Sonoma State University. Kate has a enthusiasm for the automotive field.

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Why Is my "Check Engine" irradiate On?

You've addressed the issue that made your "check engine" light turn on, but now the won't rotate off! This may not be her fault. Sometimes the computer system in your car will require a tiny help to view that the concern has to be resolved. I'll walk over a few techniques for resetting your examine engine light.

This light screens itself once the onboard computer system system recognizes an electric or mechanical trouble with her vehicle. Once the trouble is fixed, the engine irradiate does not constantly turn off. This deserve to be annoying, cause you come fail one emissions (smog) test, or store you native finding out around future difficulties the vehicle's computer might it is in trying come alert girlfriend to.

Of course, it is vital to be certain that the light isn't on since your engine really does still have a problem. Try one (or more) the the complying with approaches to revolve the irradiate off. If that does not go off, then your engine has a problem.

MethodTools Required

1. Drive your car and also let light go off through itself.


2. Rotate the engine on and also off three times in a row.


3. Disconnect and also reconnect the battery.


4. Usage an OBD password reader.

Wrench and OBD reader

1. Drive her Car and Let the Light go Off by Itself

The an initial and easiest method for clearing the examine engine light is driving and time. Most onboard computer systems will recheck whatever trouble caused the examine engine light to activate many times. Journey your car as you normally would.

If the inspect engine irradiate is tho on after three days, your difficulty may not have actually been addressed or you may need to shot some that the methods below to reset it.

2. Rotate the vehicle On and also Off 3 Times

Some vehicles will immediately reset the problem codes that resulted in the initial error ~ the automobile is turned on and off three times in succession. To carry out this, insert your crucial into the ignition, turn the vehicle on for around a second, and also then off for about a second. Repeat this two much more times then journey the vehicle as normal. Check to watch if the examine engine light reset.

3. Disconnect and Reconnect the Battery

You will need a wrench. Prop open up the hood and also use the wrench come disconnect the confident power cable to the automobile battery. Leaving the battery disconnected because that at least 15 minutes. Then put your key into the ignition and turn it 3 times come the “ON” position. This will certainly clear the emissions data indigenous the car memory and the readiness flag data.

Reconnect the confident battery cable and also turn the vital in the vehicle ignition. Wait one minute and also the examine engine irradiate error should be gone.

4. Use an OBD password Reader

You will require a wrench and an OBD (onboard diagnostic) reader. These cheap readers analyze and clear engine codes. I have used the Kobra OBD scanner with great success countless times because that this task.

To carry out this method:

Plug the reader right into the OBD harbor of your vehicle. This harbor is usually located on the underside that the dash area just over the foot well. On part vehicles, you'll have to remove the door on your fuse crate to accessibility this port.Once you have connected the reader, press the "enter" switch to rotate it on.The machine will scan your engine for any type of error codes. When done analyzing, the reader will certainly display any kind of error codes it finds. Make keep in mind of the codes (if any) if you wish to cross check them in the code reader's manual or online.Now you have the right to press the "scroll" button to uncover the alternative to erase the code. Press go into while top top this option to erase the fault code and reset the inspect engine light.


Frequently asked Questions

Here are simply a handful of generally asked inquiries related come this issue.

Can the inspect engine light turn off by itself?

Yes, occasionally the light will turn off by itself as you drive it approximately for a while after addressing the concern that made it turn on in the first place.

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

There could be a few reasons why this is happening. A loosened gas cap, failing engine sensors, bad spark plugs, faulty valves such together in the EGR (exhaust gas recirculation) system, or intermittent misfiring might all it is in potential culprits. In this case, it's often ideal to take it your auto into a mechanic shop to acquire a diagnostic, or at the very least use an OBD leader yourself.

Does the inspect engine light revolve off immediately after repair?

Sometimes yes and also other times no. If the worry has to be repaired and the computer system has to be cleared v a scan device or code reader, climate the light display turn off reasonably soon after.

That's not constantly the case though, and also the light might still stay on (or rotate on and off intermittently)—especially if you have a larger electrical or wiring problem.

If you acquired your car repaired in ~ a mechanic shop and also the worry seems to be resolved yet the light stays on, however, then you should take it back to the shop and also ask the mechanic if they have the right to reset the light.

Do I require a special tool to rotate off my check engine light?

Yes. If you desire to revolve off your check engine light yourself, climate you will require an OBD password reader. That plugs right into the diagnostic port generally located under the dashboard in cars made in 1996 or after. These tools can it is in purchased at miscellaneous automotive components stores or virtual at various retailers such together Amazon.

Be advised, however, that if you usage an OBD reader to clean the code however the concern has no actually to be resolved, then the check engine light will most likely turn earlier on again sometime soon thereafter.

These methods Should aid You Reset Your examine Engine Light

Following these methods will enable you to rid the annoying examine engine light too as allow for new problems to be shown properly.

Whether you choose to manually reset the onboard computer by resetting the battery or by utilizing an OBD reader, friend will have the ability to successfully fix the error. You may use these approaches to resolve the check engine irradiate error as well as any other errors in the future should they present themselves.

This article is accurate and also true come the finest of the author’s knowledge. Content is for informational or entertainment objectives only and does not substitute for an individual counsel or skilled advice in business, financial, legal, or technological matters.

Questions & Answers

Question: deserve to I get rid of the "check engine" light without one onboard diagnostic reader?

Answer: You absolutely can, but it may be more difficult. I would start by do the efforts the other methods outlined in this article. If those don't work, climate there is most likely something mechanically wrong with the vehicle.

It can be as straightforward as replacing straightforward to reach $10 sensor that has actually gone bad, or much much more difficult. When some skilled mechanics have the right to troubleshoot your vehicle and locate the issue without the assistance of an OBD reader, most world (such as myself) need a password reader to do things much easier for us.

A password reader can aid you through manually enabling you to clear the fault code that has caused the check engine irradiate to illuminate (in situation it to be stuck on because of an error in the car's computer), or if over there truly is something mechanically wrong then it can give you the "error code" the your automobile is producing.

This error password is the actual factor the check engine light has been activated. You have the right to then look up this error code in the reader's manual or online and also see what the concern is with your vehicle in plain English. It is a handy device that even most skilled mechanics quite heavily rely on this days.

Question: Why did my check engine irradiate come on after ~ I changed some fuses?

Answer: most likely one the these cases occurred:

1. You replaced a fuse v a fuse that an untrue value. Double check that you provided the correct kind of fuse every the vehicle's manual.

2. One of the fuses you put is negative or conveniently went bad after installation, bring about one that the solution in your car to prevent working correctly.

3. You changed a bad fuse, resulting in a device in your vehicle that was not working formerly to begin working. The system has an problem causing your vehicle to display screen the examine engine light. This is less likely if the examine engine irradiate wasn't on before this.

4. It's a coincidence and another device in your car started to endure an issue just ~ you replaced the fuse. Think it or not, this does happen even though it is likewise less likely.

The easiest means to narrow under the trouble is to usage an OBD 2 reader, such together the one I connected to in the article, to check out the trouble codes from your car's computer. You have the right to then cross recommendation this code virtual or with the manual that comes through the reader to find out specifically which mechanism is leading to your car's examine engine irradiate to illuminate.

Question: I changed my vehicle's O2 sensor, disconnected and also reconnected the battery many times, and also even changed its plugs, however the check engine light came earlier on after ~ a 45 kilometres drive. What should I do next?

Answer: If your car is 1996 or more recent model, friend should attach its computer to an OBD2 reader to discover out what error password it's generating.

Once you gain this code, you'll have the ability to translate it and also gain a better understanding of what is wrong v your vehicle.

If it says it is "out of range," i beg your pardon is really common when a sensor malfunctions, change the faulty sensor. Climate take the actions outlined in this post to reset the inspect engine light.

© 2012 Kate Daily


Joseph Mwai top top June 27, 2020:

Shailesh top top June 25, 2020:

The problem is this - once you reset the irradiate either by utilizing a scanner or disconnecting the battery, the obd monitotrs get reset and show together incomplete. While every the monitors present ready after driving the automobile a few miles, the catalyst screen does not. When it does become ready, the light is ago on. So ns cannot obtain the auto to pass the smog test. Thoughts? I have a 2000 Honda CR-V.

Bethany H ~ above June 19, 2020:

I make the efforts #3 on my 2007 Nissan xterra. It functioned like a charm. Say thanks to you!!

Jerry Abbott top top June 12, 2020:

My Sister had actually a Lincoln her light came On--they knowed this ford Manchinic --good friends --He came out and also fixed the Problem---He called her--give me about 20 minute and also Your inspect Engine light will never ever come ~ above again --and Your automobile will happen Inspection --Your ~ above Board computer system will not Relize the check engine irradiate is On and also it won't present on The Dash Board---==she drove around 5 much more years and also it never came top top again--and that Passed inspection each year after that what did that Do

Fred Reed ~ above June 07, 2020:

I have a 2007 Chrysler PT Cruiser which the password reader indicating P0700 together default come the infection what would certainly be the systems to this problem

Holly on may 29, 2020:

I have a 2014 evade Charger. The 2 fuel pumps were replaced. Engine irradiate is on. Once checked it claims it's the fuel pumps yet they've to be replaced and car runs. Assist please.

Mike on in march 05, 2020:

My toyota obd has no power,all fuses space ok.what the H is wrong? I have actually tuck battery attach off,but three dsys its ago on.

George Sinese top top February 24, 2020:

Thank you, Kate,,,,, very helpful !

Genine on February 23, 2020:

My check engine light come on and it verified that it was the thermostat. I had actually it fixed and the light is tho on my 2010 nissan altima. I have actually a push start button.

Jim Stiver on January 26, 2020:

I tried #3 and it functioned on mine 2012 dodge Caravan...Thanks...Jim

Sandra on January 26, 2020:

Do you reconnect the battery vable then revolve the an essential to on place 3 times or befor you reconnect

Rick ~ above January 18, 2020:

I removed active shutter grill. Execute you introduce a scanner that deserve to disable code, po59f. I deserve to clear it, need to disable.

TonyB47 on January 11, 2020:

I replaced both and so on sensors and engine quiet runs slow after heat up and eats alot that gas. It is a 98 suberban. What else can it be?

DANIEL HAYES top top January 09, 2020:

Have a 2010 Ford Explorer,have 7 codes all pertaining come emissions, prefer o2 sensor , egr valve , map sensor etc... Changed all parts yet still having check engine quiet on ?? and also car shuts off as soon as stopped at light or when a most stop & walk traffic

hector on October 21, 2019:

a 2001 toyota corolla the inspect engine light is on. I erase it and also i have the right to drive that as lot as i want to and it won't rotate on until i turn off the car and also turn it ago on in a couple of minutes the light turns on.

Thabana top top October 16, 2019:

I desire to uncover out what the problem could be if my automobile check engine light transforms it self on and off. The light turned it me on Friday and also I plugged in my obd2 scanner which provided me problem codes P0101 and also P0420 and I to be planning to take it come the mechanic on the following Friday and now the Wednesday afternoon, once I check the light is off by that self and also without having addressed the problem.

Mike top top September 17, 2019:

I have actually a Ford focus SE 2007. Ns just had actually a auto mechanic just replace the fuse because that my dash. And also the minute ns turned the engine over. Once I acquired it back. The inspect engine light come on. I know every little thing checks the end fine. Example: the OD I code is reset. I had the engine solved so it can pass The smog. They also gave that a full diagnostic. The an initial time around. Offered it a lube and also oil change. Uncovered out it was a valve stuck open up for emissions system. Deserve to I quiet drive?. My mom says she going out of the nation on the 18th that this month. Sorry, ns don’t sleep well once a examine engine irradiate is on.

Atiq ~ above July 29, 2019:

I hv gained honda accord 2003, examine engine light is on. I checked with code leader it offered me hit sensor error. I replaced the knock sensor but the examine engine light is still on. What shall i do?

hotmail.com top top July 03, 2019:

2007 honda public si 2.0 liter ..ok mine story goes prefer this my 2nd fan was not working ,so mine air conditioning was warm and also cold . For this reason while my engine was to run I determined to pull my relays out all sudden ns pulled this relay and also the auto sounded choose it had a feet in muffler like it lost power so I acquire in it and also all these lights came on put the relay earlier in and shut it turn off , so all lights as soon as of and also the check engine light to be still on.got my obd device erased inspect engine irradiate ..light didi no come ago on after ~ driving it . But on the fifth day went ago with the obd reader and also it has actually a yellow light..instead the a eco-friendly . Password reads as complies with p1659 and also it claims #1tacm relay stuck turn off #2etcs manage relay failure .. Automobile runs good but please help me I have actually to obtain this automobile inspected . And also there was nothing wrong with this automobile until ns pulled the relay out while mine engine was running .

Valentino olape ~ above June 21, 2019:

My 2000 volvo v40 just how to reclaim i turned off the engine irradiate on& code.

Clifford ~ above June 04, 2019:

My ford focus ecoboost mirrors the yellow engine light however just gone to a service. Ho need to I reset it. The make some funny sound on the desh plank don't understand if it have actually a faulty

Bianca on might 20, 2019:

I have actually a 2005 acura tl just got out that the shop because that a infection rubuild and now inspect engine light is on reading a code of p0741

Andy Rodeheaver on might 04, 2019:

how to eliminate engine light, had checked they claimed to google this number P0743

Eugene M Gershunov on may 02, 2019:

I cannot pass the smog check since the secondary air injection ports space plugged through carbon deposits. What execute you introduce to carry out to clean the ports there is no bringing the automobile to a an equipment shop? the is an extremely expensive. Ns turned turn off the check-engine light and followed your referrals from "Tips and tricks ...". And also burned 2 tanks of gas (more 보다 500 miles) yet the AIR check on OBD is tho red. You re welcome help.

I would start by contacting the garage (or looking at her paperwork) and also getting make and part variety of the alternator and also starter lock installed. Then dual check the those items room compatible with your car. I have never heard of a starter bring about the light yet the dorn alternator certain can!

louise sara mc menamin on march 23, 2019:

i had actually my auto in the garage and got the starter and also alternator replaced...once i put diesel in the engine, the engine monitoring light came on..obviously i understand theres nothing wrong with the car..how perform i gain this off...Ford focus 2010

Al Ong on march 03, 2019:

I make the efforts to revolve the automobile on and off three Times however the check engine light won't walk away. My automobile is Honda Odyssey (2011), is the an approach (method 2 every instruction) working on Honda Odyssey?

faraz ~ above January 17, 2019:

swift 2015 exactly how to examine engine light eliminate sometime indicate

Seanbike top top December 04, 2018:

This information has actually been an extremely helpfull. Thanks

Debbie Pemental on October 22, 2018:

If disconnect mine battery and also reconnect it and also the engine light goes off will it pass inspection

Lee on respectable 04, 2018:

As for action 2 above: execute you actually have to start the car for a second, then rotate off for 1 2nd - 3 times, OR do you simply turn the ignition an essential to the ON place for 1 2nd then ago to the OFF place for 1 second - 3 times.? many thanks a lot. I am having actually this difficulty for 5 years now, and replacing the very same item O2 Sensor, each year, I have to present proof the a $200,- repair bill each year just to have the ability to get a Emissions waiver from the State Police come be allowed to renew mine tags in my county in the state that NC. That is a hassle.

James wilson top top July 28, 2018:

My bmw 320i has a fault code analysis nox sensor heating ican put it off with my disgnostic an equipment and journey for miles however when i avoid the car and start to journey again it comes earlier on you re welcome help

Joel top top June 26, 2018:

Hello, my 2009 A4 engine light proceeds to come on. My mechanic has actually reviewed it and ran tests on it and cannot find anything wrong with my car, even though the engine irradiate is on. Any suggestions on what to do or perhaps what it can be?

Theo on might 17, 2018:

Google the OBD code, there all in over there !

waylon ~ above April 17, 2018:

I have actually a 97 audi a4 1.8t and also the inspect engine oil level andcheck engine light is on and also it won't shift in reverse or drive how do I solve it

Kate everyday (author) native California top top January 08, 2018:

No, problem! good luck, let us know exactly how it goes!

bryan on January 07, 2018:

Thanks a lot of Kate...i now have an idea of exactly how to remove my problem!... Because that my Ford emphasis 2008 model!

Adrian F. Good ~ above December 26, 2017:

Credible suggestions. I'll shot the an initial three and if lock don't fix it, I'll take it it to mine auto mechanic and ask that to use his OBD code reader. What a pains in the neck that is to install a brand-new battery in a late model car. Many thanks for your advice, Kate Daily.

A loosened or damaged gas lid is actually a pretty typical reason the a examine engine light will come on. Her car's computer probably simply needed a tiny help after ~ you fixed the issue. Girlfriend did the right thing!

Yes, as long as your inspect engine light continues to be off transparent the smog test, you have to be fine. Take it a look in ~ my other article (below) which might be helpful to make particular your vehicle passes smog. Good luck!


Penny Lister on December 11, 2017:

my check engine irradiate was remaining on so I replaced the gas cap, yet the light was still on, so i took the floor cable loose from mine 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 driven the car approximately 30 miles due to the fact that then and it is quiet off. Execute you think I have fixed the problem and do you think i deserve to now happen emmissions?

Kate daily (author) indigenous California ~ above December 07, 2017:


There can only it is in a couple of reasons why the examine engine light would certainly remain. These space in order native the many likely reason to the least likely:

Possibility 1 - The problem that brought about the computer's error code (which is making the check engine irradiate illuminate) was not totally fixed. Even if you replaced the sensor, it may not have truly to be a faulty sensor the is the issue. It may have been what the sensor is detecting (i.e. A bigger issue with the engine).

Possibility 2 - over there is an concern with the link to the sensor. I recognize you confirm for loose connections, but did you inspect the wiring native the computer system to the sensor itself? try doing this by making use of an ohm meter to acquire a reading on the resistance throughout just the sensor, then affix the sensor and also find the exact same sensor wires back at the car's computer. Test the resistance in between those two wires ago at the car's computer. They should be just around the same resistance. If the resistance is significantly higher or lower than what the resistance was across just the sensor through itself, then you have an problem with the wiring and/or link to the sensor.

Possibility 3 - The car's computer system is faulty, this is by far the the very least common. Check out items 1 and also 2 above first.

I expect this provides you a an excellent starting point. If you would certainly like, post what certain error code your car's computer is offering you (read the codes through the OBD 2 reader) and I can provide you more ideas on wherein to look.

Rick dreves top top December 07, 2017:

What if you've done all these procedures and also your check engine irradiate is tho on changed all O2 sensors map sensor examine for all loosened connections and also a great ground however the engine irradiate still on and also still gives the exact same code the you just repaired

Kate everyday (author) indigenous California top top October 08, 2017:

Hi Paul, i would definitely start through canceling the fault code to check out if the password comes back. If the does then it may not have actually been the sensor chin that's the problem, quite it may be what the sensor is detecting. Right here are some thoughts that might be helpful:

1 - inspect for loosened or corroded electric connections in the wiring harness close to the sensor.

2 - are there any other electric related concerns with the car? If therefore they could be related (like a loose or corroded ground connection wire).

3 - inspect the vacuum mechanism (i.e. Vacuum hoses and also connectors) for any type of lose or brittle/broken parts. If you have a little vacuum hose v a cracked in it, that could reason your fault. Try using a vacuum gauge because that chasing down any issues v the vacuum system.

Hopefully you discover some the this helpful for resolving your problem!

Paul Luckhurst ~ above October 08, 2017:

Had no acceleration,fault code P0105 map sensor. I have replaced the Sensor,but still have actually acceleration trouble (but not as bad) ? If ns cancel fault code, will certainly it clear, and also reset engine earlier to common operating mode

Krissy chestnut on April 19, 2017:

I have a 2005 Chevy Cobalt and also my check engine light came on . So ns hooked the scanner approximately my car and it claimed for me come reset the check engine light. So i did and also a couple of days later the check engine irradiate came back on and it's still speak I have to reset the examine engine light. Additionally the light goes off and also then will come ago on. Please help!!! I'm in ~ my wits end.

betty graske top top April 11, 2017:

I have a 2001 toyota highlander and the engine light was on. Ns took that to mine mechanic and he stated he repaired the problem. Went under the road 2 miles and also it came earlier on. Take it it ago to him and 3 days later he claimed it was done. Went under the road and also the gas gauge was no working. Took it earlier again and also he claimed the wire damaged off. I have reason to believe he disconnected my engine check light. How do i have actually that confirm without spending an ext money.

Levi top top January 28, 2017:

Good day i have actually a mitsubishi lancer 4g92. I visited two different diagnostic. Both called me their scanner isnt picking up any problems. The vehicle cranks but wont rotate over. I adjusted plugs but im no getting any spark. I changed cam and crank sensor. No one of this has worked. The check light is coming on together usual then it will certainly go off as usual. Even with the engine irradiate on im still not getting any kind of reading. What is this difficulty i to be facing? Help.

joeblevins top top December 31, 2016:

Wow...unbelievable...after fixxing the oxygen sensor on mine Ford traveler XLS to gain it to happen the emissions check the check engine irradiate turned bk. On...couldnt think it, for this reason I believed i probably had actually to return to the shop for more examination yet thanx to this website i followed the easy steps to reset the myself... And sure sufficient i unplugged the pos. Cable together described and follow the remaining steps before reattaching the cable bk on and also to my amaze it WORKED!!!!... WooHoo!!!!!!....Thanx because that the beneficial info to aid solve the problem...2 THUMBS UP!!!!!!!!....

joeblevins ~ above December 31, 2016:

Wow ns cant believe after i obtained my oxgyen sensor fixed on my 2001 Ford explorer XLS came bk top top after having it addressed to pass Illinois emission Test that this details i check out on line wit u guys functioned 100% plus ...I complied with all steps provided and the one that removed the check engine light to be unplug the pos. Battery terminal and inserting the key before re-attaching the cable bk... I believed i would have to take that bk to the shop for more examination but dont require too...Thanx for the info. On exactly how to reset the trouble myself...2 thumbs up for this website....

Evans ~ above November 25, 2016:

I followed the manual method the light turn off momentarily and then came earlier on! Mine is a 2009 mazda bongo van. The irritating irradiate is quiet on.

Stephanie on October 09, 2016:

I reseted my engine light however now before I foolly revolve on the car it still turns on

BIG ED!!! on September 03, 2016:

Wooohooo. Left my dome light on, which eliminated the battery in my Subaru Forester. Turn the automobile on many times together indicated over and the reset the examine engine light, hill descent and traction manage lights and the auto is back to normal. Thanks

John on august 13, 2016:

Thanks so much!! I discovered other sites that advised to disconnect the battery, but yours was the only one that advised to put the auto in the "on" position 3 times before connecting the battery again. This seems to have done the trick. The irradiate is no longer on.

ben thuku on respectable 05, 2016:

my prando examine engine shows once the car inclines .

what is the problem?

Your Name ~ above November 28, 2015:

help my toyota probox,,when ns drive 5okms,the engine gets yes, really hot and all over sudden that switches turn off while top top motion.when cool it takes turn off for a brief distance and then showing check engine then it walk off!whats the issue?

felicia on April 22, 2015:

Help, my Honda right 2007 is acting up! as soon as I was driving top top the highway yesterday the engine light revolve on , additionally while accelarating the auto was not accelerating to par. I visited take it to auto zone and also they go a diagnostic check little device that looks prefer a phone and also it claimed that the oil press was low etc etc. What does that mean. I confirm my engine oil and also its fine. Is the expensive come fix? Please aid me.

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

Thank you for the info Mr. Wolfy. The is true about what you are saying. I had the same problem with the light. And also some one walk all the work. The irradiate is no much longer on.