This guide walks you through how to reset check engine light with Actron Autoscanner Plus safely and effectively. You’ll learn setup, scanning, clearing codes, and troubleshooting tips to keep your vehicle running smoothly.
Key Takeaways
- Understand the purpose of the check engine light: It alerts you to potential engine or emissions issues that need attention before they worsen.
- Use the Actron Autoscanner Plus correctly: Follow proper connection and menu navigation steps to avoid errors or damage.
- Always diagnose before clearing codes: Resetting the light without fixing the problem will only cause it to return.
- Ensure your vehicle is ready for a reset: Turn off accessories, keep the engine off, and use a stable power source during the process.
- Verify the reset was successful: Drive your car for a few miles and recheck the scanner to confirm the light stays off.
- Know when to seek professional help: If the light returns repeatedly, there may be a deeper issue requiring expert diagnosis.
- Maintain your scanner: Keep firmware updated and store it properly to ensure long-term reliability.
Introduction: Why Resetting the Check Engine Light Matters
The check engine light is one of the most misunderstood warning signals in your vehicle. While it can indicate anything from a loose gas cap to a serious engine malfunction, it’s not something you should ignore—or panic over. Many drivers assume that simply turning off the light will solve the problem, but that’s rarely the case. However, once the underlying issue has been diagnosed and repaired, resetting the check engine light is a necessary step to restore normal vehicle operation and prepare for future diagnostics.
If you’ve recently fixed a problem—like replacing an oxygen sensor or tightening your gas cap—you’ll want to clear the stored trouble codes so your vehicle’s onboard computer can start fresh. This is where tools like the Actron Autoscanner Plus come in handy. This affordable, user-friendly OBD2 scanner allows you to read and clear diagnostic trouble codes (DTCs) without visiting a mechanic. In this guide, we’ll walk you through how to reset check engine light with Actron Autoscanner Plus in a safe, effective, and beginner-friendly way.
By the end of this article, you’ll know exactly how to connect the scanner, interpret error codes, clear the check engine light, and verify that the reset was successful. We’ll also cover common mistakes, troubleshooting tips, and best practices to ensure your vehicle stays in top condition.
What Is the Actron Autoscanner Plus?
The Actron Autoscanner Plus is a handheld OBD2 (On-Board Diagnostics II) scanner designed for home mechanics and car enthusiasts. It’s compatible with most vehicles made after 1996, which are required to have OBD2 systems in the United States. The device plugs into your car’s OBD2 port—usually located under the dashboard near the steering wheel—and communicates with the vehicle’s computer to retrieve diagnostic information.
Visual guide about How to Reset Check Engine Light with Actron Autoscanner Plus
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Key features of the Actron Autoscanner Plus include:
- Reading and clearing diagnostic trouble codes (DTCs)
- Displaying real-time engine data (like RPM, coolant temperature, and fuel trim)
- Checking emissions readiness status for state inspections
- No batteries required—powered directly through the OBD2 port
- Compact, portable design with an easy-to-read LCD screen
Unlike more advanced professional scanners, the Autoscanner Plus is designed for simplicity. It doesn’t require a smartphone app or Wi-Fi connection, making it ideal for quick diagnostics and resets. While it won’t perform complex repairs, it’s perfect for identifying common issues and clearing the check engine light after repairs are completed.
When Should You Reset the Check Engine Light?
Resetting the check engine light isn’t something you should do on a whim. The light exists for a reason—it’s your car’s way of saying, “Hey, something’s not right.” Before you even think about clearing the code, you need to understand why the light came on in the first place.
Common reasons for the check engine light include:
- Loose or faulty gas cap
- Failing oxygen (O2) sensor
- Catalytic converter issues
- Mass airflow (MAF) sensor problems
- Spark plug or ignition coil failure
- Evaporative emissions system leaks
Once you’ve identified and fixed the issue—whether it’s tightening the gas cap or replacing a sensor—you can safely reset the light. Resetting it prematurely, without addressing the root cause, will only result in the light coming back on, often within a few miles of driving.
Additionally, some states require a “ready” status on emissions monitors before you can pass a smog check. Clearing the codes resets these monitors, so you may need to drive your car for a few days (following specific drive cycles) to allow the system to recheck itself. We’ll cover this in more detail later.
Tools and Preparation Needed
Before you begin, make sure you have everything you need. The good news? You probably already have most of it.
Required Tools
- Actron Autoscanner Plus scanner
- Vehicle with OBD2 port (1996 or newer model year)
- Owner’s manual (for locating the OBD2 port and understanding error codes)
Preparation Steps
Follow these steps to ensure a smooth and safe reset process:
1. Park Your Vehicle Safely
Make sure your car is parked on a flat, level surface with the engine turned off. Engage the parking brake and, if possible, place wheel chocks behind the tires for extra safety.
2. Turn Off All Accessories
Turn off the radio, air conditioning, headlights, and any other electrical accessories. This reduces the load on the vehicle’s electrical system and ensures stable communication between the scanner and the car’s computer.
3. Locate the OBD2 Port
The OBD2 port is usually found under the dashboard on the driver’s side, near the steering column. It’s a 16-pin connector that looks like a trapezoid. If you can’t find it, consult your owner’s manual—some vehicles have it hidden behind a small panel or under the glove compartment.
4. Check Scanner Compatibility
Confirm that your vehicle is OBD2-compliant. Most cars and light trucks from 1996 onward are, but older vehicles or certain imports may not be. The Actron Autoscanner Plus will not work with non-OBD2 systems.
5. Charge Your Scanner (If Applicable)
While the Autoscanner Plus draws power from the OBD2 port, it’s a good idea to ensure the device is in working order. If it has a rechargeable battery or requires batteries, make sure they’re charged or replaced.
Step-by-Step Guide: How to Reset Check Engine Light with Actron Autoscanner Plus
Now that you’re prepared, let’s walk through the actual process of resetting the check engine light. Follow these steps carefully to avoid errors.
Step 1: Plug In the Scanner
Take your Actron Autoscanner Plus and locate the OBD2 connector on the end of the cable. Align it with the OBD2 port in your vehicle and push it in firmly until it clicks into place. Do not force it—if it doesn’t fit easily, double-check the orientation.
Once connected, the scanner should power on automatically. You’ll see the Actron logo appear on the screen, followed by a menu or prompt. If the screen remains blank, check the connection and ensure the ignition is in the “ON” position (engine off).
Step 2: Turn the Ignition to the “ON” Position
With the scanner plugged in, turn your vehicle’s ignition key to the “ON” position. Do not start the engine—just turn it far enough to power up the dashboard lights and electronics. This allows the scanner to communicate with the vehicle’s computer.
You should see the scanner’s screen light up and display a menu. If it doesn’t, try unplugging and reconnecting the scanner, or check that the ignition is fully in the “ON” position.
Step 3: Navigate the Scanner Menu
The Actron Autoscanner Plus has a simple menu system. Use the arrow buttons to scroll through options. Look for a menu item labeled “Read Codes,” “DTCs,” or “Scan.” Select it by pressing the “Enter” or “OK” button.
The scanner will now communicate with your vehicle’s computer. This may take a few seconds. Once complete, it will display any stored diagnostic trouble codes (DTCs). These codes are usually in the format “P0XXX,” where “P” stands for powertrain and the numbers indicate the specific issue.
Step 4: Review the Trouble Codes
Before clearing the codes, take a moment to review them. Write down the codes or take a photo of the screen for reference. This information is crucial for diagnosing the problem.
For example, a code like “P0455” indicates a large evaporative emissions leak—often caused by a loose gas cap. A “P0302” code means a misfire in cylinder 2, which could be due to a bad spark plug or ignition coil.
If you’re unsure what a code means, consult the Actron code library (available online or in the manual) or use a free OBD2 code lookup tool. Understanding the code helps ensure you’ve actually fixed the problem before resetting the light.
Step 5: Clear the Codes
Once you’ve confirmed the issue has been repaired, it’s time to clear the codes. From the main menu, navigate to “Clear Codes,” “Erase DTCs,” or a similar option. Select it and confirm when prompted.
The scanner will send a command to your vehicle’s computer to erase all stored trouble codes. You may see a message like “Codes Cleared” or “Reset Complete.” This process usually takes just a few seconds.
Important: Do not clear codes if you haven’t addressed the underlying issue. The check engine light will likely return, and you’ll have to repeat the process.
Step 6: Turn Off the Ignition and Unplug the Scanner
After the codes are cleared, turn the ignition back to the “OFF” position. Wait about 10–15 seconds, then unplug the scanner from the OBD2 port. Store the scanner in a dry, safe place for future use.
Step 7: Start the Engine and Check the Light
Start your vehicle and observe the dashboard. The check engine light should remain off. If it comes back on immediately, there may still be an active problem that wasn’t fully resolved.
Allow the car to idle for a few minutes to ensure everything is running smoothly. Listen for unusual noises and watch for other warning lights.
Verifying the Reset Was Successful
Clearing the codes is only half the battle. To ensure the reset was truly successful, you need to verify that the check engine light stays off and that your vehicle is operating normally.
Drive Your Vehicle
Take your car for a short drive—about 10–15 miles—under normal conditions. This allows the onboard computer to run self-checks and monitor various systems. If the light remains off during and after the drive, the reset was likely successful.
Recheck with the Scanner
After driving, plug the Actron Autoscanner Plus back in and perform another scan. If no new codes appear, that’s a good sign. However, if the same code returns, the original problem may still exist or a new issue has developed.
Check Emissions Readiness
If you’re preparing for a smog check, note that clearing the codes resets the emissions monitors. These monitors need time to run their self-tests. Depending on your vehicle, you may need to complete specific drive cycles—such as highway driving, cold starts, and stop-and-go traffic—to set the monitors to “ready.”
Use the scanner to check the readiness status before your inspection. If any monitors show “Not Ready,” you may fail the test even if the check engine light is off.
Troubleshooting Common Issues
Even with careful preparation, things don’t always go as planned. Here are some common problems and how to fix them.
Scanner Won’t Power On
If the Actron Autoscanner Plus doesn’t turn on when plugged in:
- Check that the ignition is in the “ON” position.
- Ensure the OBD2 port is clean and free of debris.
- Try a different vehicle to rule out a faulty scanner.
- Inspect the scanner’s cable for damage.
No Communication with Vehicle
If the scanner displays “No Data” or “Link Error”:
- Verify the vehicle is OBD2-compliant (1996 or newer).
- Try unplugging and reconnecting the scanner.
- Ensure the OBD2 port is receiving power (test with a multimeter if possible).
- Check for blown fuses related to the OBD2 system.
Check Engine Light Returns Immediately
If the light comes back on right after clearing:
- The original problem may not be fully resolved.
- There could be an intermittent issue that hasn’t been detected yet.
- The vehicle’s computer may need more time to complete self-checks.
- Consult a mechanic if the light persists.
Codes Won’t Clear
If the scanner says “Clear Failed”:
- The ignition may not be in the correct position.
- The vehicle’s computer may be in a protected mode.
- Try turning the ignition off and on again before retrying.
- Ensure the scanner is compatible with your vehicle’s make and model.
Safety Tips and Best Practices
While using the Actron Autoscanner Plus is generally safe, it’s important to follow best practices to protect yourself and your vehicle.
- Never use the scanner while driving. Always perform diagnostics with the engine off or in a safe, parked position.
- Keep the scanner dry. Avoid using it in rainy or humid conditions.
- Don’t force connections. If the scanner doesn’t plug in easily, check the port and cable for damage.
- Update firmware when available. Check Actron’s website for software updates that improve compatibility and performance.
- Store the scanner properly. Keep it in its case or a dry drawer to prevent damage.
- Use only for intended purposes. The Autoscanner Plus is not a repair tool—it’s for diagnostics and resets only.
Conclusion: Take Control of Your Vehicle’s Health
Resetting the check engine light with the Actron Autoscanner Plus is a simple yet powerful way to take control of your vehicle’s maintenance. By following the steps in this guide, you can safely clear trouble codes, verify repairs, and ensure your car is running efficiently.
Remember, the check engine light is your car’s way of communicating with you. Don’t ignore it—and don’t just reset it without understanding the cause. Use the Actron Autoscanner Plus as a diagnostic partner to identify issues early, save money on mechanic visits, and keep your vehicle in peak condition.
With a little practice, you’ll become confident in using your scanner to read codes, clear the light, and maintain your car like a pro. And the next time that little orange light pops up, you’ll know exactly what to do.