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Is There A Fuse For The Check Engine Light? Fuses and the Check Engine Light's Function

Engine lights don't have their own designated fuse.

Suppose you are driving in your car, and you look down and see that your check engine light is on. You get your car checked out, and whatever made it come on gets fixed. Driving again later, your check engine light is still on. You may wonder - "Is there a fuse for the check engine light?"

There is no fuse for the check engine light, but there is a way to reset it using the engine control unit fuse. The location of the fuse boxes depends on the model of your car, but it will generally be on the side of the driver's side console or near the engine.

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    Engine lights don't have their own designated fuse.
    Engine lights don't have their own designated fuse.

    Where Is The Engine Light Fuse?

    There is no fuse for the check engine light. The engine fuse (or rather, the engine control unit fuse) is located in a fuse box in your car. The location of the fuse box depends on the make and model of your car, and most cars have at least two fuse boxes.

    Under the hood

    The primary place that you will find a fuse panel is the one located under the hood in the engine compartment.

    The side of the dashboard

    If you look at the driver's side of the dashboard, next to the instrument cluster, there will be a removable plastic part. Taking this off will expose your fuse panel.

    Finding the fuse

    Finding the fuse is simple - there should be a 'map' or a diagram of what all the fuses do somewhere on your fuse box. If you do not see the fuse you are looking for in one fuse box, check the other one. If there is no diagram, check online for your specific make and model of car.

    How Do You Change A Check Engine Light Fuse?

    You can reset the check engine light (again, actually the engine control unit fuse) simply by using your fingers or a fuse puller to grip the end of the fuse and pull it out, then replace it with a new fuse. When you go to replace a blown fuse, however, be aware that there are many distinct types of fuses, each with different amperage ratings (the number on the fuse). Your replacement fuse will need to be the same type and amperage rating. Here are some of the more common types of fuses:


    This is the most common fuse type. They measure 10.9mm x 3.6mm and extend out to 16.3 mm.

    Low-profile Mini

    These are small, compact fuses, though not the smallest. They are squatter than the mini - the blades extend out about half as far.


    These tall thin fuses are the smallest types of fuses that you can find.


    A Micro3 will have three terminals instead of two - this is the only fuse with this feature.


    Also known as regular or standard fuses, this is the largest of this fuse group.


    These are the largest fuses and are not typically used in your vehicle.

    A blown fuse.
    A blown fuse.

    Can A Blown Fuse Turn On The Check Engine Light?

    When a fuse is blown, it can turn on a check engine light. One way that you can diagnose this is to go to a mechanic and have them run a diagnostic, though it is much cheaper (free) to go to your local automotive shop and ask to borrow their OBD code reader and check the fault codes yourself by hooking it to your car's computer.

    If you don't know how to hook it up, an employee at the automotive shop can show you and they can provide you with a complete diagnostic report with all the error codes when complete. If a blown fuse is the culprit of the check engine light coming on, then you are well situated to buy the fuses you need and change out the fuse within ten to fifteen minutes.

    Is There A Way To Turn Off The Check Engine Light?

    There are several ways to turn off the check engine light. Check engine lights tell you if there is an issue with your vehicle. However, if it is cleared and you are looking for a way to perform a check engine light reset, try one of the following methods.

    Let it turn off by itself

    Once a fault is cleared in your car, it takes a few cycles to clear on its own. A cycle here is defined as turning your car on and off. This may take a few days to clear. If your check engine light is still not off, make sure that there isn't another reason that it is still on.

    Turn the ignition on and off

    If you have a few minutes to kill and have the patience, sit there and turn your car on and off until it clears out. This should take no more than a few minutes to clear the check engine light.

    Use an OBD code reader

    While not all OBD code readers offer this feature, you may be able to turn off the check engine light with it after all the faults have been cleared. You can find one at your local automotive shop or get one online. The cheapest one will run you about $25, but check the features on the OBD code reader before buying it.

    The more features that it comes with, the more expensive it will be - professional models can cost thousands of dollars. It is also possible to download apps to your phone to do this, though check the app's requirements as it may not work for your vehicle.

    Disconnecting the battery will reset the check engine light.
    Disconnecting the battery will reset the check engine light.

    Disconnect your battery

    This method doesn't work on every make and model, but if you have a stubborn check engine light, it is worth a try. Disconnect your battery's negative terminal (the black-colored one, marked with the minus sign) and wait thirty seconds before reconnecting it.

    Your check engine light should be reset. However, make sure you keep an eye on your check engine light after you reset it. If it comes on after you have driven for a few miles, there is something wrong with your automobile that needs to be fixed.

    Pull the engine control unit fuse

    As previously mentioned, pulling the engine control unit fuse can help you turn off your check engine light. When you pull it, give it about thirty seconds before replacing the fuse.


    If the check engine light comes on in the vehicle, don't just look for a way to turn it off automatically - check to see what is wrong. But if you have already taken care of the issue and the check engine light won't go off, there are several ways to fix the problem. These include letting it turn off by itself naturally, resetting it with a code reader, disconnecting the battery, or simply pulling the engine control unit fuse.