How to Reset Check Engine Light?

How to reset check engine light? The on-off method is the equivalent fix for a vehicle’s check engine light. It forces the computer to refresh its saved state through a reboot. Simply place your key into the ignition and turn it on for 1-2 seconds, then turn it off for 1-2 seconds. Repeat this step three or four times.

Reset check engine light

:small_blue_diamond:By the mid-90s, refined improvements to automotive engines and related systems had made major strides in dropping hydrocarbon emissions to very low levels. In fact, almost zero. Emission control systems had come of age.

:small_blue_diamond:With these control systems came the need to confirm proper operation. Thus onboard diagnostics were born. In 1996 the On-Board Diagnostic version 2 (OBD2) system arrived, and with it came the often maligned Check Engine Light (CEL).

:small_blue_diamond:Located in the instrument panel, this warning light is sometimes called the Malfunction Indicator Light (MIL) or Service Engine Light (SEL).

Reset Check engine light BMW

:small_blue_diamond:When something goes wrong with your engine or emissions system, your check engine light may come on or start flashing. Although you shouldn’t ignore the issue or try to reset a check engine light without solving the problem, there are certain cases where you may want to learn how to reset a check engine light at home! Here’s how to get started if you drive with BMW.

When Should You Reset Your Check Engine Light?

:small_blue_diamond:If you’re thinking about resetting your check engine light automatically, ask yourself a few questions first. Have you solved the problem that caused the light to come on? Since most BMW models use a Condition-Based Servicing system, your check engine light should automatically reset if and when the offending issue has been resolved.

:small_blue_diamond: If your gas cap isn’t loose, and you’re pretty sure that you solved the problem that caused your check engine light to come on, it may be time to perform a manual reset. Although it’s always a safer bet to schedule service or run a diagnostic check with a scanner at home, there is a way to reset your check engine light.

How To Reset a Check Engine Light: Disconnect Your Battery

:small_blue_diamond:If you’ve determined that your check engine light is not supposed to be on, you can perform a manual reset by disconnecting your negative battery cable:

  1. Turn off your engine and put on the appropriate safety gear, including safety glasses and gloves.

  2. Locate the negative battery terminal, which will usually be marked by a black cap, a negative (-) symbol, or both!

  3. Working carefully, loosen the negative terminal with a wrench. Pull the cable off of the terminal, and hold it aside for about a minute.

  4. Reconnect the negative cable tightly, and make sure that everything is back in place.

  5. This process should cause your check engine light to go off. However, you may need to drive for 20-40 miles before the change can take effect. If the light still doesn’t go off, it’s likely that you’ve missed the core issue.

Reset check engine light Mercedes

:small_blue_diamond:Your car’s check engine light serves an important purpose, but once it illuminates, it can be difficult to get it to turn back off – even after you’ve had your car inspected and serviced. Sometimes, there might not even be anything actually wrong with your vehicle. Still, the check engine light was triggered and has become quite an annoyance during your daily Cincinnati commute.

First, Determine Whether There’s An Issue to Resolve:
:small_blue_diamond:First things first: before you reset your check engine light, you need to have your vehicle inspected to determine whether there’s a problem to address. Visit your preferred service center to have diagnostics run on your vehicle. If an issue is discovered, it’s recommended that you schedule a service appointment to have it resolved without delay. The longer you wait, the bigger (and costlier) the problem can become.

Try Disconnecting the Negative Battery Cable:
:small_blue_diamond:If your service technician determines that there is no service issue with your vehicle, your best option is probably to reset the check engine light manually. Oxford car owners who don’t spend much time under the hood of their car may be nervous to try this method, but it’s easier to carry out than you might imagine! Of course, you can always schedule an appointment with Mercedes-Benz of West Chester to have our expert service techs handle everything, too.

Here are the steps for how to reset a check engine light manually:

  1. Make sure your car is turned off and cooled down before you begin. For your safety, it’s smart to wear cotton gloves and plastic goggles during this process.

  2. Pop the hood and locate the negative terminal on the battery. Usually, it has a black cap and a negative (–) symbol. For reference, the positive cap (which you will not be using) is red and will have a positive (+) sign.

  3. Using a wrench, loosen the nut on the negative terminal. Then, pull the negative connector away from the battery and leave it moved aside for 30 to 60 seconds.

  4. After 30 to 60 seconds have passed, you can reconnect the negative cable and use your wrench to tighten it up again.

  5. Monroe drivers can usually reset the check engine light successfully following this method, but in the event that it doesn’t work, there’s a much simpler process to try. Get the details in the next section.

The Gas Cap Trick:
:small_blue_diamond:Sometimes, a loosened or cracked gas cap is the culprit of a triggered check engine light. This typically happens because of the fumes that are released. Simply remove your gas cap and put it back in place. Turn your car on, and the engine light may already be reset. If not, it might take a few cycles of turning your car off and on to make it reset. In some cases, it helps to drive around for a few miles, too.

Reset check engine light Jaguar

No one wants to see their check engine light come on while they’re driving through Jersey City or Fort Lee. For some drivers, checking the gas cap or taking care of the causal issue at home is quicker and easier than scheduling a service appointment. Still, you might wonder what happens if your check engine light doesn’t go off automatically. If you don’t mind getting under the hood, it’s easy to learn how to reset a check engine light at home.

Reset Your Check Engine Light at Home

:small_blue_diamond:Before we go any further, we think it’s important to point out that your Jaguar check engine light won’t just come on by accident. Although some potential causes are quick and easy to fix, you should only reset your check engine light by hand if you know what caused the problem and you’re certain that you fixed it by hand.

:small_blue_diamond:If you do perform a manual reset, and your check engine light still comes on after you start driving, make sure to schedule service and have the issue resolved by an expert at our Paramus service department.

:small_blue_diamond:The easiest way to reset a check engine light is to disconnect the negative (black/-) battery cable and hold it to the side for 30 to 60 seconds. This will allow your internal diagnostics systems to reset.

:small_blue_diamond:If you’ve never disconnected your battery before, we’re happy to report that you only need a few easy-to-use tools. Grab safety glasses, a pair of gloves, and a wrench. You’re ready to get started:

  1. Turn your engine off, apply the parking brake, and open the hood.

  2. Locate your Jaguar vehicle’s negative battery terminal. Loosen the cable with a wrench, and pull it off.

  3. Keep the cable in your hand for a minute or more, and then reconnect it with your wrench.


In most cases, the warning lights on your car’s dashboard are helpful and important. However, sometimes they are simply disruptive and provide little or no benefit. For example, you might have already addressed the issue that caused the check engine light, yet the light is still illuminated. You have a few options, such as using an OBD-II scanner, reconnecting the battery, etc.

What Is the Check Engine Light?

:small_blue_diamond:A check engine light, commonly referred to as a CEL is a small warning light on your car’s dashboard that indicates that something is wrong with your vehicle and is triggered by one of your car’s sensors.

Reasons the Check Engine Light Turns On

:small_blue_diamond:There are countless reasons why your check engine light could turn on. Your car could have faulty wiring, a bad oxygen sensor, misfires, and a thousand other reasons. There’s no one definitive answer, unfortunately, and you’ll have to do some legwork to find out what’s what.

:small_blue_diamond:Everything You’ll Need To Reset the Check Engine Light
We’re not psychic, nor are we snooping through your toolbox or garage, so here’s exactly what you’ll need to get the job done.


  • OBD2 scanner
  • Socket wrench set

:small_blue_diamond:Organizing your tools and gear, so everything is easily reachable will save precious minutes waiting for your handy-dandy child or four-legged helper to bring you the sandpaper or blowtorch. (You won’t need a blowtorch for this job. Please don’t have your kid hand you a blowtorch—Ed.)

:small_blue_diamond:You’ll also need a flat workspace, such as a garage floor, driveway, or street parking. Check your local laws to ensure you’re not violating any codes when using the street because we aren’t getting your ride out of the clink.
An OBD2 scanner coupled to a phone app.

Here’s How To Reset Your Check Engine Light

:small_blue_diamond:There are a few different methods to clear a check engine light, but the two most common are using an OBD2 scanner and disconnecting and reconnecting the battery. Ready to get schooled?

Let’s do this!
Using an OBD2

  1. Locate your car’s OBD2 port underneath the steering wheel or within the passenger-side footwell

  2. Plug in the OBD2 scanner and power it on.

  3. After inputting your car’s information, turn the car on and run a test to find the code responsible for the check engine light.

  4. Your car’s error codes should display. These error codes will tell you what triggered the code and what is wrong with the vehicle. You can then use them to fix the issue.

  5. For the intents and purposes of this article, let’s suppose you fixed the issue.

  6. After you’ve fixed the faulty part or parts, use the scanner to erase the codes. You can wait a moment to see if the code returns. If it doesn’t, you can proceed. If it does, well, you need to know if you properly fixed the issue.

  7. Start the car and see if the check engine light is out. It may take a few minutes for the computer to reset.

Turning It Off and On Again
:small_blue_diamond:Like the running gag on BBC’s The IT Crowd, have you tried turning your car off and on by disconnecting and then reconnecting the battery?

  • Remove the negative cable from the negative terminal—the one with the minus sign.

  • Depending on the design of the battery, you may need a wrench to loosen the cable-free.

  • Remove the positive cable from the positive terminal—the one with the plus sign. If you are using a tool like a wrench, make sure the metal doesn’t contact the terminal as it will spark.

  • Wait 15 to 30 seconds.

  • Reconnect the positive terminal.

  • Reconnect the negative terminal.

  • Test the car and see if the check engine light isn’t on.

A common thing asked often

:small_blue_diamond:In a car, when there is an engine problem, the check-engine-light is supposed to come on. Let event E be the event that there’s an engine problem, and event C be that the check engine light is on. When there is an engine problem, the check engine light turns on 80% of the time. When there is no engine problem, check-engine-light depends on 10% of the time.

:small_blue_diamond:Historically that engine has a problem with a probability of 5%. What is the unlimited possibility that the check-engine-light turns on? What is the probability that there is an engine problem when the check-engine-light turns on?

:small_blue_diamond:From the given question. It means even the angel has a problem. He means even the check engine lights turn on here. We have the information that is probably of the year Is equal to 0.05. Our probability of ever. That is equal to 1 -2 one minus 0.051 min. 0.05 is equal to 0.95. So probably this last year, E R A is equal to zero point 80 probability of E R. A bar Is equal to 0.10. Now we need to find the probability of the check engine light. Right? Dance on. Yeah.

:small_blue_diamond:Using the probability theater. Mm-hmm. Using this BF Yeah, wow, P is equal to prof E R A. Bless Yeah. A bar. P multiplayer with Yeah. But now, in other values, By substituting the value of zero 05 multiplied with zero, Brian paid zero bless 0.95 multiplayer with 0.10. by simplifying this. We get the easy quality 0.135.

:small_blue_diamond:Now we need to find the probability that there is Indian when Yeah, in general, light Danson using that based here now property half P F R E is equal to do P R P M. And to play with pr A R E divided by prof. We asked E R A blessed by everybody I want to play wither ever but substituting the values we get 0.05 multiplied with 0.80 divided by zero Brand 135. Nobody simplifies this. Very good. 0.04. The dreaded bay Zero Bryant Run three or 5, 0.04 x 0.135 is equal to 0.29 63.

Frequently Asked questions

Here are some frequently asked questions regarding

Q1- How Much Does It Cost To Reset a Check Engine Light?
That depends on whether it’s an errant error code or something wrong with your car. Resetting the check engine light after you’ve already repaired your vehicle, however, costs nothing if you already have an OBD2 scanner. If you don’t, you can purchase ($30-$70) or rent one from your local auto parts store.

Q2-How Often Do You Need To Reset Your Check Engine Light?
You only need to reset your check engine light after it comes on. If you’re routinely resetting it, you may have a larger issue you need to take care of.

Q3- Will a Check Engine Light Reset Itself?
If you own a modern vehicle and have already fixed the issue that caused the check engine light, the light may reset itself after a few miles, as normal operations return.

Q4- Can You Reset a Check Engine Light Without Disconnecting the Battery?
If your car has an OBD2 outlet, you won’t have to disconnect the car’s battery. If your vehicle is pre-OBD2, you may have to disconnect the battery.

Q5- How much does it cost to turn off the check engine light?
According to the 2017 Vehicle Health Index compiled by the automotive diagnostic website CarMD in Irvine, CA, the average cost to resolve an indicated check engine light issue is $398, including parts and labor, which is 2.7% higher this year than it was in 2016.

Q6- What is the most common reason for a check engine light?
Replacing a faulty oxygen sensor — a sensor used to optimize a vehicle’s fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause of a check engine light.

Q7- Why is my engine light on, but nothing seems wrong?
Do a brake and steering check. If nothing seems to be acting strange, it is probably safe to drive it until you can get it into a mechanic. Sometimes the light may come on after fueling if the gas cap is a little loose. Or it could mean your catalytic converter needs to be inspected

Q8- What is the most common reason for check engine light?
Replacing a faulty oxygen sensor — a sensor used to optimize a vehicle’s fuel-to-air mixture to increase gas mileage and reduce emissions — is the most common cause of a check engine light.

Q9- Can AutoZone check the engine light?
AutoZone can diagnose Check Engine Light codes, yes. If your engine light turns on and you wonder why, head down to your local AutoZone, where one of our store associates can help diagnose the issue through our free Fix Finder service.

Q10- How serious is a check engine light?
Both a solid and flashing engine check light indicates that a problem has been detected. However, a flashing engine check light indicates that it is a serious problem that requires immediate attention. If you see a flashing light, it’s best to contact a mechanic as soon as possible to prevent serious damage.


:small_blue_diamond:If you reset your check engine light and head straight to your smog test, you will likely fail inspection because these readiness checks have not yet been completed. In other words, you may still fail an emissions test even if the check engine light is off.

:small_blue_diamond:It may take up to a week for all readiness checks to finish, depending on the vehicle and your specific driving conditions.While it may seem scary at first, the check engine light is usually nothing to fear. Diagnostic trouble codes exist to help you and your technician diagnose small problems with your vehicle before they become big problems.

:small_blue_diamond:It’s always a good idea to get your check engine light scanned, so you know the nature of the problem that has been reported. Many auto parts stores can perform this service for free.

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