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How to Reset the Check Engine Light?

- Last Edited: Aug 27, 2023
- Popularity: 81 Views


Resetting the Check Engine Light (CEL) can be done using various methods, but it's important to note that simply clearing the light without addressing the underlying issue may lead to the light returning if the problem persists. The Check Engine Light is an indicator that something is potentially wrong with your vehicle, so it's recommended to diagnose and fix the root cause before attempting to clear the light.

Here's a general procedure for resetting the Check Engine Light:

1. Address the Issue: Before attempting to clear the Check Engine Light, it's important to diagnose and address the underlying problem that triggered the light in the first place. This might involve using an OBD-II scanner to retrieve the diagnostic trouble code (DTC) that caused the light to come on. Once you've identified the issue, repair or replace the faulty component.

2. OBD-II Scanner: If you're certain that the issue has been resolved and you want to clear the Check Engine Light, you can use an OBD-II scanner. Follow these steps:

      • a. Locate the OBD-II port in your vehicle. It is typically located under the dashboard, near the driver's seat.

      • b. Plug the OBD-II scanner into the port.

      • c. Turn on the ignition (but do not start the engine).

      • d. Follow the scanner's instructions to read and clear the codes. This process may vary depending on the scanner you're using.

      • e. Once the codes are cleared, the Check Engine Light should turn off. Note that some scanners might not be able to clear certain "permanent" codes.

3. Disconnect the Battery: Another method to reset the Check Engine Light is to disconnect the vehicle's battery. However, this method might also reset other settings in your vehicle, such as radio presets and the clock. Here's how:

      • a. Locate the negative (-) terminal of the battery.

      • b. Use a wrench or pliers to loosen and disconnect the negative terminal. Make sure it is safely isolated to prevent accidental reconnection.

      • c. Wait for about 15-20 minutes to ensure that any residual power is drained from the vehicle's systems.

      • d. Reconnect the negative terminal and tighten it securely.

      • e. Start the engine and check if the Check Engine Light is off. Note that it might take a short drive for the light to reset.

Remember, while these methods can clear the Check Engine Light, they do not address the root cause of the issue. If the light comes back on after resetting it, it's best to have your vehicle inspected by a qualified mechanic to diagnose and repair the problem.

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