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Why will the OBD II tester not turn off the check engine light?

by udiagtech 13 Sep 2023 0 Comments

The ominous glow of the check engine light on your car's dashboard can be a source of anxiety for any vehicle owner. It's a signal that something might be wrong with your vehicle's performance. However, before you rush to the mechanic, you can take matters into your own hands with the help of an OBD (On-Board Diagnostics) scanner. In this essay, we will explore the process of resetting the check engine light using an OBD scanner, helping you understand and manage this common automotive issue effectively.

 I. Understanding the Check Engine Light

The check engine light is a small yet significant indicator on your dashboard. It serves the critical purpose of alerting you to potential problems within your vehicle's systems. When the check engine light illuminates, it signifies that your car's onboard computer has detected an issue, which could range from minor to severe. It's important to realize that the light itself doesn't pinpoint the exact problem; rather, it serves as a general alert.

 II. Preparations

Before diving into the process of resetting the check engine light, you should gather some essential tools and materials. These may include an OBD scanner (readily available at automotive stores or online), gloves, and safety glasses. Safety should always be a priority when working on your vehicle.

III. Identifying the OBD Port

The OBD scanner connects to your vehicle through a standardized OBD port. To locate this port, consult your vehicle's manual. Typically, it can be found beneath the dashboard near the steering column, but its exact location may vary depending on your car's make and model. Familiarizing yourself with its position is crucial.

IV. Connecting the OBD Scanner

Once you've located the OBD port, it's time to connect your scanner. First, ensure that your vehicle's ignition is turned off. Then, follow the manufacturer's instructions to properly plug in the OBD scanner. Once connected, you can proceed with turning on the ignition.

V. Using the OBD Scanner

Most OBD scanners have user-friendly interfaces. When you access the menu, you will usually find options like "Read Codes," "Erase Codes," or "Clear DTCs" (Diagnostic Trouble Codes). Before resetting the check engine light, it's essential to read and record the diagnostic trouble codes (DTCs). These codes provide valuable information about the specific issue triggering the light. Remember that clearing the codes without diagnosing and addressing the underlying problem is not a recommended practice, as it might lead to recurrence.

VI. Resetting the Check Engine Light

To reset the check engine light, select the option on your OBD scanner's menu that corresponds to clearing DTCs or erasing codes. Confirm your action, and the scanner will communicate with your vehicle's onboard computer to reset the light. Be aware that some OBD scanners may require specific procedures, so it's crucial to follow the instructions provided with your particular model.

VII. Verifying the Reset

After successfully resetting the check engine light, turn off your vehicle and wait for a few minutes. Then, restart the engine. Check the dashboard to ensure that the check engine light remains off. If it does, you've likely resolved the issue that triggered the light. However, if the light reappears shortly after resetting, it's a sign that the underlying problem persists, and further diagnostics and repairs are necessary.

VIII. Troubleshooting

In some cases, you might encounter issues during the reset process. It's important to troubleshoot these problems or seek assistance if needed. Common issues could include connectivity problems with the OBD scanner or difficulties in accessing the reset option.


Resetting the check engine light using an OBD scanner is a practical and cost-effective way to address minor automotive issues. However, it's crucial to emphasize that resetting the light should not be seen as a permanent solution but rather a diagnostic step. To ensure the continued health of your vehicle, address the root cause of the problem by performing proper maintenance and seeking professional assistance when needed. By following these steps and practicing regular vehicle maintenance, you can keep your car running smoothly and your check engine light at bay.



  1. How often should I reset the Check Engine light?

It's best to reset it once you've addressed the issue that triggered the light. Don't ignore it for too long.

  1. Can I drive with the Check Engine light on?

You can, but it's not advisable. It's a warning sign that something needs attention.

  1. Do I need a professional mechanic to reset the light?

Not necessarily. Many issues can be resolved by DIY enthusiasts using an OBD scanner.

  1. What if the light comes back after I reset it?

If it returns, it indicates an unresolved issue. You should investigate further.

  1. Is it safe to clear OBD codes without fixing the problem?

Clearing codes without fixing the problem is a temporary solution. It's best to address the root cause for long-term reliability.

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