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

You are watching: Mazda 3 check engine light reset


Why Is mine "Check Engine" irradiate On?

You've fixed the problem that made her "check engine" light revolve on, however now the won't revolve off! This may not be your fault. Periodically the computer system in your auto will require a tiny help to see that the worry has been resolved. I'll go over a couple of techniques for resetting your check engine light.

This light display screens itself once the onboard computer system system establish an electric or mechanical difficulty with her vehicle. When the problem is fixed, the engine irradiate does not always turn off. This can be annoying, reason you to fail one emissions (smog) test, or keep you from finding out around future difficulties the vehicle's computer might it is in trying come alert friend to.

Of course, that is vital to be sure that the irradiate isn't on due to the fact that your engine yes, really does still have a problem. Try one (or more) that the following approaches to rotate the irradiate off. If it does no go off, then her engine has actually a problem.

MethodTools Required

1. Drive your car and also let light walk off by itself.


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


3. Disconnect and also reconnect the battery.


4. Usage an OBD code reader.

Wrench and also OBD reader

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

The very first and easiest an approach for clearing the examine engine light is driving and also time. Most onboard computers will recheck whatever problem caused the inspect engine irradiate to activate lot of times. Drive your automobile as you generally would.

If the examine engine irradiate is tho on after three days, your problem may not have been fixed or you may need to try some the the methods below to reset it.

2. Turn the car On and also Off 3 Times

Some vehicles will instantly reset the trouble codes that resulted in the early error ~ the vehicle is rotate on and off 3 times in succession. To execute this, insert your vital into the ignition, revolve the automobile on for around a second, and also then off for about a second. Repeat this two an ext times then drive the auto as normal. Inspect to check out if the examine engine irradiate reset.

3. Disconnect and also Reconnect the Battery

You will need a wrench. Prop open the hood and use the wrench to disconnect the positive power cable to the car battery. Leaving the battery disconnected for at least 15 minutes. Then put your an essential into the ignition and also turn it three times come the “ON” position. This will certainly clear the emissions data indigenous the auto memory and also the readiness flag data.

Reconnect the positive battery cable and also turn the key in the car ignition. Wait one minute and the check engine light 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 actually used the Kobra OBD scanner with an excellent success countless times for this task.

To perform this method:

Plug the reader right into the OBD port of your vehicle. This port is usually situated on the underside that the dash area just above the foot well. On part vehicles, you'll need to remove the door on your fuse box to access this port.Once friend have linked the reader, push the "enter" button to rotate it on.The device will scan her engine for any error codes. Once done analyzing, the reader will certainly display any type of error password it finds. Make note of the password (if any) if you great to cross inspect 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 ~ above this choice to erase the fault code and also reset the check engine light.


Frequently inquiry Questions

Here are simply a grasp of commonly asked concerns related to this issue.

Can the inspect engine light revolve off by itself?

Yes, sometimes the irradiate will revolve off by itself together you drive it around for a while after ~ addressing the worry that made it rotate on in the an initial place.

Why does my inspect engine light turn on and off intermittently?

There can be a few reasons why this is happening. A loose gas cap, failing engine sensors, poor spark plugs, faulty valves such as in the EGR (exhaust gas recirculation) system, or intermittent misfiring could all it is in potential culprits. In this case, it's often ideal to take your automobile into a mechanic shop to get a diagnostic, or in ~ the very least usage an OBD leader yourself.

Does the inspect engine light turn off automatically after repair?

Sometimes yes and also other time no. If the concern has to be repaired and the computer has been cleared through a scan device or code reader, then the light present turn off relatively soon after.

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

If you acquired your auto repaired at a mechanic shop and also the worry seems to it is in resolved yet the light continues to be on, however, climate you should take it earlier to the shop and ask the mechanic if they deserve to reset the light.

Do I require a special tool to turn off my inspect engine light?

Yes. If you want to rotate off your inspect engine light yourself, then you will need an OBD password reader. It plugs into the diagnostic port typically located under the dashboard in cars make in 1996 or after. These gadgets can it is in purchased at miscellaneous automotive components stores or digital at various retailers such together Amazon.

Be advised, however, that if you usage an OBD reader to clear the code however the issue has no actually to be resolved, climate the examine engine irradiate will most likely turn back on again sometime soon thereafter.

These techniques Should assist You Reset Your check Engine Light

Following these techniques will enable you come rid the annoying check engine light too as enable for brand-new problems come be displayed properly.

Whether you pick to manually reset the onboard computer system by resetting the battery or by using an OBD reader, you will have the ability to successfully solve the error. You may use these methods to resolve the inspect engine irradiate error and any various other errors later should they current themselves.

This write-up is accurate and true to the finest of the author’s knowledge. Content is for informational or entertainment functions only and does no substitute for personal counsel or skilled advice in business, financial, legal, or technical matters.

Questions & Answers

Question: have the right to I eliminate the "check engine" light without one onboard diagnostic reader?

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

It can be as simple as replacing an easy to with $10 sensor that has gone bad, or much an ext difficult. When some skilled mechanics have the right to troubleshoot their vehicle and locate the issue without the aid of an OBD reader, most human being (such together myself) require a code reader to make things easier for us.

A password reader can aid you by manually enabling you to clean the fault code that has actually caused the examine engine irradiate to illuminate (in instance it to be stuck on because of an error in the car's computer), or if over there truly is miscellaneous mechanically wrong climate it can provide you the "error code" that your auto is producing.

This error password is the actual factor the examine engine light has actually been activated. You can then look increase this error password in the reader's hands-on or online and see what the worry is with your car in plain English. That is a handy tool that even most experienced mechanics quite greatly rely on this days.

Question: Why walk my examine engine light come on ~ I changed some fuses?

Answer: most likely one the these cases occurred:

1. You changed a fuse with a fuse that an untrue value. Twin check that you provided the correct kind of fuse per the vehicle's manual.

2. One of the fuses you placed is bad or conveniently went poor after installation, causing one that the systems in your automobile to protect against working correctly.

3. You replaced a negative fuse, resulting in a device in your automobile that was not working formerly to begin working. That system has an problem causing your car to screen the inspect engine light. This is less likely if the check engine light wasn't on prior to this.

4. It's a coincidence and another mechanism in your automobile started to experience an problem just ~ you changed the fuse. Believe it or not, this does happen also though that is additionally less likely.

The easiest means to narrow under the difficulty is to use an OBD 2 reader, such as the one I linked to in the article, to read the trouble codes from your car's computer. You can then cross referral this code digital or through the hand-operated that comes with the leader to find out exactly which device is bring about your car's examine engine light to illuminate.

Question: I changed my vehicle's O2 sensor, disconnected and also reconnected the battery lot of times, and also even changed its plugs, however the examine engine irradiate came earlier on ~ a 45 km drive. What need to I execute next?

Answer: If your vehicle is 1996 or more recent model, girlfriend should affix its computer system to an OBD2 reader to discover out what error code it's generating.

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

If it says it is "out that range," which is an extremely common once a sensor malfunctions, change the faulty sensor. Climate take the steps outlined in this short article to reset the examine engine light.

© 2012 Kate Daily


Joseph Mwai on June 27, 2020:

Shailesh ~ above June 25, 2020:

The problem is this - when you reset the irradiate either by making use of a scanner or disconnecting the battery, the obd monitotrs get reset and show as incomplete. While all the monitors display ready after ~ driving the vehicle a few miles, the catalyst monitor does not. As soon as it does end up being ready, the light is earlier on. So ns cannot gain the automobile to happen the smog test. Thoughts? I have a 2000 Honda CR-V.

Bethany H on June 19, 2020:

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

Jerry Abbott on June 12, 2020:

My Sister had actually a Lincoln she light came On--they knowed this ford Manchinic --good girlfriend --He came out and fixed the Problem---He called her--give me around 20 minute and also Your check Engine light will never ever come top top again --and Your auto will pass Inspection --Your on Board computer will no Relize the check engine irradiate is On and also it won't show on The Dash Board---==she drove around 5 an ext years and also it never came on again--and that Passed inspection each year after that what did the Do

Fred Reed on June 07, 2020:

I have a 2007 Chrysler PT Cruiser i m sorry the code reader denote P0700 as default come the transmission what would certainly be the solution to this problem

Holly on may 29, 2020:

I have actually a 2014 dodge Charger. The 2 fuel pumps were replaced. Engine light is on. Once checked it says it's the fuel pumps but they've to be replaced and also car runs. Assist please.

Mike on march 05, 2020:

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

George Sinese top top February 24, 2020:

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

Genine ~ above February 23, 2020:

My inspect engine light come on and it proved that it to be the thermostat. I had actually it fixed and the irradiate is still on my 2010 nissan altima. I have a press start button.

Jim Stiver top top January 26, 2020:

I make the efforts #3 and also it functioned on mine 2012 dodge Caravan...Thanks...Jim

Sandra top top January 26, 2020:

Do girlfriend reconnect the battery vable then revolve the an essential to on position 3 time or befor friend reconnect

Rick ~ above January 18, 2020:

I removed active shutter grill. Carry out you introduce a scanner that have the right to disable code, po59f. I deserve to clear it, have to disable.

TonyB47 on January 11, 2020:

I changed both and so on sensors and engine still runs sluggish after warmth up and eats alot that gas. That is a 98 suberban. What else can it be?

DANIEL HAYES on January 09, 2020:

Have a 2010 Ford Explorer,have 7 codes every pertaining come emissions, favor o2 sensor , egr valve , map sensor etc... Changed all parts yet still having examine engine still on ?? and also car shuts off as soon as stopped at light or once a lot of stop & go traffic

hector top top October 21, 2019:

a 2001 toyota corolla the check engine irradiate is on. I erase it and i have the right to drive that as lot as i want to and it won't revolve on until i revolve off the car and also turn it earlier on in a couple of minutes the light transforms on.

Thabana on October 16, 2019:

I desire to find out what the problem could be if my auto check engine light turns it self on and also off. The light turned it me on Friday and I plugged in mine obd2 scanner which gave me trouble codes P0101 and P0420 and I to be planning to take it come the mechanic on the following Friday and now the Wednesday afternoon, once I inspect the light is turn off by it self and without having actually addressed the problem.

Mike on September 17, 2019:

I have a Ford focus SE 2007. I just had actually a auto mechanic simply replace the fuse because that my dash. And also the minute ns turned the engine over. As soon as I obtained it back. The check engine light come on. Ns know whatever checks the end fine. Example: the OD I password is reset. I had the engine resolved so it deserve to pass The smog. They also gave it a complete diagnostic. The very first time around. Offered it a lube and also oil change. Found out it was a valve stuck open for emissions system. Can I tho drive?. My mom says she going out of the nation on the 18th of this month. Sorry, ns don’t sleep well when a examine engine light is on.

Atiq top top July 29, 2019:

I hv obtained honda accord 2003, check engine light is on. Ns checked through code reader it offered me hit sensor error. I changed the hit sensor yet the examine engine light is tho on. What shall ns do?

hotmail.com ~ above July 03, 2019:

2007 honda public si 2.0 liter ..ok my story goes favor this my second fan was not working ,so mine air conditioning was warm and also cold . So while my engine was to run I decided to traction my relays the end all sudden ns pulled this relay and also the vehicle sounded favor it had actually a feet in muffler like it lost power therefore I acquire in it and also all this lights came on placed the relay ago in and shut it turn off , so every lights as soon as of and also the inspect engine light to be still on.got my obd device erased inspect engine light ..light didi no come earlier on ~ driving it . However on the 5th day went back with the obd reader and it has a yellow light..instead that a eco-friendly . Password reads as complies with p1659 and also it states #1tacm relay stuck turn off #2etcs control relay breakdown .. Auto runs good but please assist me I have to get this vehicle inspected . And there was nothing wrong through this vehicle until ns pulled that relay out while my engine was running .

Valentino olape on June 21, 2019:

My 2000 volvo v40 just how to restore i deleted the engine light on& code.

Clifford top top June 04, 2019:

My ford emphasis ecoboost mirrors the yellow engine light yet just gone to a service. Ho need to I reset it. It make part funny sound top top the desh board don't understand if it have actually a faulty

Bianca on may 20, 2019:

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

Andy Rodeheaver on may 04, 2019:

how to get rid of engine light, had checked they claimed to google this number P0743

Eugene M Gershunov on may 02, 2019:

I cannot happen the smog check since the second air injection ports are plugged with carbon deposits. What do you introduce to do to clean the ports there is no bringing the vehicle to a device shop? the is really expensive. I turned turn off the check-engine light and followed your referrals from "Tips and tricks ...". And burned 2 tanks the gas (more 보다 500 miles) however the AIR check on OBD is quiet red. Please help.

I would begin by contacting the garage (or feather at her paperwork) and getting make and also part number of the alternator and starter they installed. Then dual check the those items space compatible v your car. I have never heard that a starter leading to the light yet the wrong alternator certain can!

louise sara mc menamin on march 23, 2019:

i had actually my auto in the garage and also got the starter and alternator replaced...once i put diesel in the engine, the engine management light come on..obviously i know theres naught wrong through the car..how do i acquire this off...Ford focus 2010

Al Ong on in march 03, 2019:

I make the efforts to revolve the car on and off three Times but the inspect engine light won't go away. My car is Honda Odyssey (2011), is the an approach (method 2 per instruction) functioning on Honda Odyssey?

faraz top top January 17, 2019:

swift 2015 exactly how to check engine light remove sometime indicate

Seanbike on December 04, 2018:

This information has actually been an extremely helpfull. Thanks

Debbie Pemental ~ above October 22, 2018:

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

Lee on respectable 04, 2018:

As for step 2 above: carry out you actually need to start the car for a second, then rotate off because that 1 2nd - 3 times, OR carry out you just turn the ignition crucial to the ON position for 1 2nd then back to the OFF place for 1 second - 3 times.? thanks a lot. Ns am having this trouble for 5 years now, and also replacing the very same item O2 Sensor, every year, I have to show proof that a $200,- repair bill yearly just to be able to get a Emissions waiver from the State Police to be allowed to renew my 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 error code analysis nox sensor heating ican put it off through my disgnostic maker and drive for miles yet when i prevent the car and also start to journey again the comes ago on you re welcome help

Joel on June 26, 2018:

Hello, mine 2009 A4 engine light proceeds to come on. My mechanic has actually reviewed it and ran tests on it and cannot uncover anything wrong with my car, also though the engine irradiate is on. Any kind of suggestions on what to perform or maybe what it can be?

Theo on might 17, 2018:

Google the OBD code, there all in there !

waylon ~ above April 17, 2018:

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

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

No, problem! an excellent luck, let united state know just how it goes!

bryan on January 07, 2018:

Thanks a lot of Kate...i now have actually an idea of exactly how to eliminate my problem!... For my Ford emphasis 2008 model!

Adrian F. Good top top December 26, 2017:

Credible suggestions. I'll shot the an initial three and if they don't fix it, I'll take it to my auto mechanic and ask the to use his OBD password reader. What a pains in the neck the is to install a brand-new battery in a late model car. Thanks for her advice, Kate Daily.

A loosened or damaged gas lid is actually a pretty usual reason the a inspect engine light will certainly come on. Your car's computer system probably simply needed a tiny help after you fixed the issue. Girlfriend did the ideal thing!

Yes, as lengthy as your examine engine light stays off throughout the smog test, you have to be fine. Take a look in ~ my other post (below) which may be helpful to make details your vehicle passes smog. Great luck!


Penny Lister on December 11, 2017:

my examine engine irradiate was remaining on therefore I changed the gas cap, however the light to be still on, so ns took the ground cable loose from my battery, pressed the horn because that 30 seconds, and also i waited because that 15 minute to reconnect the cable come the battery. When i did that, my inspect engine light is currently off. I have driven the car around 30 miles since then and it is quiet off. Perform you think I have actually fixed the problem and also do girlfriend think i can now happen emmissions?

Kate everyday (author) native California top top December 07, 2017:


There might only it is in a few reasons why the check engine light would certainly remain. These room in order native the most likely reason to the least likely:

Possibility 1 - The trouble that brought about the computer's error password (which is do the inspect engine irradiate illuminate) to be not fully fixed. Also if you changed the sensor, it may not have truly to be a faulty sensor the is the issue. That may have been what the sensor is detecting (i.e. A bigger issue with the engine).

Possibility 2 - over there is an problem with the link to the sensor. I recognize you checked for loosened connections, yet did you check the wiring native the computer to the sensor itself? shot doing this by utilizing 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 ago at the car's computer. Check the resistance between those two wires back at the car's computer. They should be just around the very same resistance. If the resistance is significantly higher or reduced than what the resistance was across just the sensor by itself, then you have an worry with the wiring and/or connection to the sensor.

Possibility 3 - The car's computer is faulty, this is by much the least common. View items 1 and also 2 over first.

I expect this provides you a an excellent starting point. If you would like, short article what details error password your car's computer system is offering you (read the codes through the OBD 2 reader) and also I can provide you more ideas on where to look.

Rick dreves top top December 07, 2017:

What if you've done all these procedures and your check engine irradiate is quiet on replaced all O2 sensors map sensor inspect for all loosened connections and also a an excellent ground yet the engine irradiate still on and still provides the exact same code the you just repaired

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

Hi Paul, ns would absolutely start by canceling the fault password to see if the code comes back. If the does climate it might not have actually been the sensor itself that's the problem, quite it may be what the sensor is detecting. Below are part thoughts that might be helpful:

1 - check for loose or corroded electrical connections in the wiring harness close to the sensor.

2 - room there any kind of other electric related concerns with the car? If for this reason they can be connected (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 actually a little vacuum hose with a cracked in it, it could reason your fault. Shot using a vacuum gauge for chasing down any type of issues with the vacuum system.

Hopefully you find some of this valuable for solving your problem!

Paul Luckhurst ~ above October 08, 2017:

Had no acceleration,fault code P0105 map sensor. I have actually replaced the Sensor,but still have actually acceleration problem (but no as bad) ? If ns cancel error code, will certainly it clear, and reset engine earlier to common operating mode

Krissy chestnut top top April 19, 2017:

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

betty graske ~ above April 11, 2017:

I have actually a 2001 toyota highlander and also the engine light to be on. I took it to my mechanic and he said he repaired the problem. Went down the road 2 miles and it came ago on. Took it earlier to him and also 3 days later he stated it to be done. Went under the road and the gas gauge was not working. Took it earlier again and he stated the wire damaged off. I have actually reason to believe he disconnected mine engine check light. Exactly how do i have that checked without spending an ext money.

Levi top top January 28, 2017:

Good day i have a mitsubishi lancer 4g92. I went to two various diagnostic. Both called me their scanner isnt picking up any kind of problems. The vehicle cranks however wont turn over. I changed plugs but im no getting any type of spark. I readjusted cam and crank sensor. Nobody of this has worked. The check light is comes on as usual then it will certainly go off as usual. Also with the engine irradiate on ns still not getting any kind of reading. What is this problem i am facing? Help.

joeblevins top top December 31, 2016:

Wow...unbelievable...after fixxing the oxygen sensor on my Ford traveler XLS to get it to happen the emissions check the inspect engine light turned bk. On...couldnt think it, so I thought i probably had to go back to the shop for additional examination yet thanx come this website i followed the easy actions to reset the myself... And sure sufficient i unplugged the pos. Cable together described and follow the continuing to be steps before reattaching the cable bk on and also to my amaze it WORKED!!!!... WooHoo!!!!!!....Thanx for the beneficial info to help solve the problem...2 THUMBS UP!!!!!!!!....

joeblevins ~ above December 31, 2016:

Wow ns cant believe after i acquired my oxgyen sensor resolved on my 2001 Ford explorer XLS came bk top top after having actually it resolved to happen Illinois emissions Test the this info i review on heat wit u guys operated 100% add to ...I adhered to all steps detailed and the one that got rid of the examine engine light was unplug the pos. Battery terminal and also inserting the vital before re-attaching the cable bk... I believed i would have to take it bk to the shop for additional examination however dont require too...Thanx because that the info. On just how to reset the trouble myself...2 thumbs up for this website....

Evans ~ above November 25, 2016:

I adhered to the manual method the light off momentarily and also then came back on! Mine is a 2009 mazda bongo van. The irritating irradiate is tho on.

Stephanie ~ above October 09, 2016:

I reseted my engine light but now before I foolly turn on the car it still turns on

BIG ED!!! on September 03, 2016:

Wooohooo. Left mine dome light on, which eliminated the battery in mine Subaru Forester. Rotate the car on lot of times as indicated above and it reset the check engine light, hill descent and traction regulate lights and the automobile is ago to normal. Thanks

John on august 13, 2016:

Thanks for this reason much!! I discovered other sites the advised come disconnect the battery, however yours to be the only one the advised to placed the vehicle in the "on" position 3 times before connecting the battery again. This seems to have actually done the trick. The irradiate is no longer on.

ben thuku on respectable 05, 2016:

my prando check engine shows when the automobile inclines .

what is the problem?

Your Name on November 28, 2015:

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

felicia on April 22, 2015:

Help, mine Honda fit 2007 is exhilaration up! as soon as I to be driving ~ above the highway yesterday the engine light revolve on , likewise while accelarating the car was not accelerating to par. I checked out take it come auto zone and also they walk a diagnostic check little machine that looks choose a phone and also it claimed that the oil press was low etc etc. What does the mean. I confirm my engine oil and also its fine. Is that expensive come fix? Please help me.

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

Thank you because that the details Mr. Wolfy. That is true around what you room saying. I had actually the same trouble with the light. And some one walk all that work. The light is no much longer on.