Seeing the check engine light illuminate on your dashboard can be unsettling, causing immediate concern for many car owners. It’s a signal that something is amiss with your vehicle, and driving with the check engine light on is generally not recommended.
But what if you could address this issue yourself, potentially saving time and money on a mechanic visit? With an OBD2 scanner, you can diagnose the problem and even reset the check engine light. This article will guide you through the simple steps of using an OBD2 scanner to turn off that persistent engine light. You might be surprised at how straightforward the process is – often no more complex than using your smartphone.
For those who prefer visual guidance, we also offer a video tutorial on our YouTube channel.
To clear the check engine light, you’ll need an OBD2 scanner, also known as an OBDII scanner or code reader. It’s crucial to choose a scanner that not only reads diagnostic trouble codes (DTCs) but also has the capability to erase them. Some basic models can only read codes, which isn’t sufficient for resetting the light.
A reliable OBD2 scanner like the CGSULIT SC301 is a great option. You can read a detailed review of the CGSULIT SC301 here. For a video review, you can also visit our YouTube channel.
Step-by-Step Guide: Resetting the Check Engine Light Using an OBD2 Scanner
While prior experience with an OBD2 scanner can be helpful, it’s not essential. If you are new to using a code reader, we have a dedicated article explaining the basics: How to Use an OBD2 Scanner: Five Easy Steps. You can also find a helpful video tutorial on our YouTube channel.
Let’s proceed with the steps to reset your check engine light:
1. Locate the OBD2 Port in Your Vehicle
The first step is to find the OBD2 port in your car. This port is typically located under the dashboard on the driver’s side. Check around the steering column, beneath the dashboard, or near the pedals. Refer to your car’s manual if you have trouble locating it.
2. Connect the OBD2 Scanner to the Port
Once you’ve found the OBD2 port, carefully connect your OBD2 scanner. Ensure it’s firmly plugged in for a stable connection.
3. Turn On the Ignition (Don’t Start the Engine)
Turn your car key to the “Ignition On” position. This powers up your car’s electrical system and the OBD2 port, but do not start the engine yet.
4. Allow the OBD2 Scanner to Scan for Error Codes
The OBD2 scanner will automatically begin scanning for diagnostic trouble codes (DTCs). Wait for the scan to complete. This process might take a few moments.
5. Read and Understand the Error Codes
After the scan, the OBD2 scanner will display a list of error codes. There could be one or multiple codes. It’s crucial to understand what these codes mean.
Interpreting the error codes is a vital step because it reveals the nature of the problem triggering the check engine light. Ignoring the underlying issue and simply resetting the light might lead to more significant problems later. If the problem is serious, the check engine light will likely reappear shortly after being reset.
Most OBD2 scanners have a built-in DTC library, allowing you to look up codes directly on the device. Alternatively, you can use online resources to search for the meaning of each code.
6. Navigate the Scanner Menu to Clear the Check Engine Light
If you’ve investigated the error code and believe it’s safe to clear (perhaps it was a minor, temporary issue, or you’ve addressed the underlying problem), navigate the OBD2 scanner’s menu to find the option for clearing codes. This is often found under a “Tools” or “Service” menu, with options like “Clear Codes,” “Erase DTCs,” or “Reset Check Engine Light.”
Select the appropriate option and confirm your choice when prompted. The scanner might ask for confirmation before clearing the codes.
7. Return to the Main Menu
Once you’ve cleared the codes, use the “Escape” or “Return” button on the scanner to go back to the main menu. This is usually the first screen you see when the scanner powers on.
8. Disconnect the OBD2 Scanner
Carefully disconnect the OBD2 scanner from the OBD2 port. If your scanner has a power button, turn it off before disconnecting. Handle the connector gently to avoid damaging the port or the scanner.
9. Turn Off the Ignition
Turn the ignition key back to the “Off” position, or as far back as it goes to turn off the car’s electrical system.
10. Start the Engine and Check if the Light is Off
Now, start your car engine normally. Check your dashboard to see if the check engine light has turned off.
If the reset was successful and the underlying issue is resolved (or was minor), the check engine light should remain off. After the engine warms up, you can restart it a few more times to confirm that the check engine light does not reappear.
Conclusion
As you can see, resetting your check engine light with an OBD2 scanner is a straightforward process, typically taking just 5 to 10 minutes, depending on your familiarity with the tool and the specific scanner model. Once you’ve done it yourself, you’ll understand the convenience and value of owning an OBD2 scanner.
However, it’s crucial to reiterate the importance of understanding the error codes before simply clearing them. While resetting the check engine light can be a helpful step after addressing a minor issue or for diagnostic purposes, it should not be used to mask serious problems. Always investigate the cause of the check engine light and address any underlying mechanical issues promptly. Ignoring significant problems can lead to further damage and costly repairs down the road.
Finally, learning to clear a check engine light is a valuable skill for anyone performing DIY car maintenance or repairs. It allows you to confirm that a repair has resolved the issue and ensures you’re not driving around with a persistent check engine light after successfully completing a fix.
