![]() If you have a couple of wrenches, it costs nothing to do Pros & Cons of Resetting the CEL by Disconnecting the Battery Use our detailed guide to find definitions and repair information for the top 20 check engine codes. If the light comes back on, you will need to diagnose and repair the concern that is causing the code. Start the vehicle and verify that the Check Engine Light is off. Connect the positive terminal first (if removed), followed by the negative. Tech tip: If you can’t touch the negative cable end to the positive cable end, disconnect the positive cable end and touch the two cable ends together.This will fully drain the vehicle’s capacitors and fully reset all the vehicle systems. The positive terminal will be labeled with a (+) positive symbol and colored red. Touch the negative cable end you just disconnected to the positive terminal still connected to the battery. It will usually be labeled with a (-) negative symbol and colored black. For most vehicles, it will be located under the hood, but for some, it may be located in the trunk or in another area of the car.ĭisconnect the negative terminal of the battery. It’s not ideal, and it will reset your clock, radio preset, and seat memory, but it’s relatively easy to do. Last but not least, if you don’t have an OBD2 scan tool and you’re far from a local auto parts store, you can reset your check engine light by disconnecting the car battery. How to Reset the Check Engine Light by Disconnecting the Battery Works from inside the vehicle – no dirt, no fuss, no need to pop the hood. Translates your OBD2 code into simple terms on your smartphoneĭoesn’t require you to reset your radio presets, clock, or seat memory Requires you to purchase FIXD or another OBD2 scanner Instantly tells you why your check engine light is on Pros & Cons of Resetting the CEL with an OBD2 Code Reader At this point, the Check Engine Light should be off, and you have successfully reset your check engine light. Now select “CLEAR” on your scan tool and clear the codes. Write down each code in case the codes come back or change later down the road. This step will vary based on the tool you’re using, but select “READ” and scroll through the codes that are active on your vehicle. Plug your scan tool into the OBD port and turn the key to the on position (gauges should be lit up, a/c will blow if it’s on, but the engine is off) You may also be interested in reading this detailed guide on how to locate the OBD port in your vehicle. It should look like the picture below, and it is usually around where your shins would be if you were sitting in the driver’s seat. We suggest that you visit our complete OBD2 scanner guide to learn everything you need to know about OBD2, including how to use it to diagnose your vehicle.Įnter the vehicle through the driver’s door and locate your OBD port. If you’re looking for an affordable, easy-to-use scanner, check out our FIXD Sensor and free OBD2 app. There is a reason behind why it is on, and if you don’t resolve the problem, the light will come right back on. A scan tool will not only clear the check engine light, but it will allow you to see why the check engine light is on in the first place. If you want to reset your check engine light without disconnecting the battery or going to a repair shop, this option is the most efficient and thorough. How to Reset Your Check Engine Light with an OBD2 Scan Tool We’ll show you three ways to do this as simply as possible. If you just repaired an issue, but the check engine light is still illuminated, you might want to clear it in order to determine if your repairs solved the problem. To prevent engine damage, do not drive the vehicle or attempt to reset the check engine light until this misfire issue is resolved.įor more help diagnosing a misfire see the following fault code pages: If your check engine light is blinking, there is an active misfire. A mechanic can read the code for you, or you can use the FIXD Sensor and free app to read it yourself and learn more about your problem before going to a shop. This could be something easy to fix or it could require more diagnostics. If your check engine light is illuminated solid, then there is an OBD2 code in the system. But if you’re seeing a light that looks like an engine or says “check engine,” pay attention to the color. There are many different types of warning lights, from tire pressure warning lights to a low oil pressure light to the ABS light. One of the most common causes of any check engine light is a loose gas cap, so be sure your gas cap is screwed on tightly and see if the light turns off. Here are 20 of the most common reasons for a check engine light based on our data. At FIXD, we’ve scanned millions of vehicles for check engine lights.
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