Can an OBD2 Scanner Reset Codes?

An OBD2 scanner is an essential tool for any car owner who wants to stay on top of their vehicle’s health. It allows you to read and understand the diagnostic trouble codes (DTCs) that your car’s computer stores when it detects a problem. But Can An Obd2 Scanner Reset Codes, too?

This article will delve into the capabilities of OBD2 scanners, explaining how they interact with your car’s computer and what to expect when using one to reset codes.

Understanding OBD2 Scanners and Diagnostic Trouble Codes

Before we answer the question “Can an OBD2 scanner reset codes?”, it’s important to understand how these two elements work together.

Your car’s onboard computer, also known as the Engine Control Unit (ECU), constantly monitors various systems within the vehicle. When it detects a malfunction, it logs a specific code, known as a Diagnostic Trouble Code (DTC), into its memory.

An OBD2 scanner acts as a bridge between you and the ECU. It retrieves these stored codes, allowing you to identify the potential issue triggering your car’s check engine light.

OBD2 Scanner Connected to Car

Can an OBD2 Scanner Reset Codes? The Short Answer is Yes

OBD2 scanners do more than just read trouble codes; they can also reset them. This functionality allows you to clear the DTCs and turn off the check engine light. However, it’s crucial to remember that resetting codes doesn’t fix the underlying problem.

Think of it like hitting the snooze button on your alarm clock. The annoying sound goes away, but the issue that woke you up remains. Similarly, resetting the codes only clears the warning signal; it doesn’t address the root cause.

How to Reset OBD2 Codes with a Scanner

The process of resetting codes with an OBD2 scanner is usually straightforward:

Connect the scanner: Plug the scanner into your car’s OBD2 port, typically located under the dashboard on the driver’s side.
Turn on the ignition: Turn your car’s ignition to the “on” position but don’t start the engine.
Access the “Read Codes” function: Navigate through the scanner’s menu to locate and select the “Read Codes” option. This will display any stored DTCs.
Select “Clear Codes”: Once you’ve reviewed the codes, find the “Clear Codes” or “Erase Codes” function.
Confirm the reset: The scanner will likely ask for confirmation. Double-check that you want to erase the codes and proceed.

OBD2 Scanner Display - Clear Codes Option OBD2 Scanner Display – Clear Codes Option

When Should You Reset OBD2 Codes?

Resetting codes is helpful in various scenarios:

After completing repairs: Once you’ve fixed the issue triggering the check engine light, resetting the codes confirms the repair was successful.
For intermittent issues: If you’re experiencing a sporadic problem, clearing the codes helps determine if the issue is resolved or recurring.
Before a smog test: In many jurisdictions, a check engine light automatically fails a smog test. Resetting the codes, if the issue is minor and resolved, allows you to pass the test.

Important: Resetting codes too soon after a repair or for serious issues can prevent your car’s computer from properly diagnosing the problem.

When Should You NOT Reset OBD2 Codes?

While resetting codes can be beneficial, there are instances where it’s not recommended:

To pass a smog test without fixing the problem: This is illegal and environmentally irresponsible.
To ignore a serious issue: If your car is exhibiting noticeable performance problems, resetting the codes will only mask the underlying issue.

Do I Need a Professional Mechanic?

While OBD2 scanners empower car owners to take a proactive approach to their vehicle’s maintenance, they don’t replace the expertise of a professional mechanic. If your check engine light persists or your car experiences performance issues, seeking professional help is always recommended.

Mechanic Using Professional Diagnostic Tool

Conclusion

Can an OBD2 scanner reset codes? Absolutely. This valuable feature allows you to clear DTCs and turn off the check engine light. However, it’s crucial to remember that resetting codes doesn’t magically fix the underlying issue.

Use your OBD2 scanner responsibly, and when in doubt, consult a trusted mechanic. How to reset obd2 codes without scanner is a question that our team often gets asked.

Frequently Asked Questions

1. Will resetting the codes void my car’s warranty?

No, resetting the codes with an OBD2 scanner won’t void your car’s warranty.

2. How long do the codes stay cleared after a reset?

The codes will remain cleared unless the issue reoccurs, triggering the check engine light again.

3. Can I use any OBD2 scanner to reset codes?

Most OBD2 scanners have the capability to reset codes, but some basic models might not. Check the scanner’s specifications before purchase.

4. What if the check engine light comes back on after resetting the codes?

This indicates the underlying problem persists. Further diagnosis is necessary to identify and fix the issue.

5. Should I be concerned if the check engine light flashes?

A flashing check engine light typically signifies a more serious problem requiring immediate attention.

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