Resetting your check engine light with an Actron Autoscanner is easy and effective. This guide walks you through connecting the scanner, reading codes, clearing the light, and ensuring your vehicle stays in top shape.
Key Takeaways
- Actron Autoscanners are user-friendly tools designed to read and clear diagnostic trouble codes (DTCs) from your vehicle’s onboard computer.
- Always diagnose the root cause of the check engine light before resetting it—clearing the light won’t fix the underlying problem.
- Ensure your vehicle is off when connecting the scanner to avoid electrical issues or damage to the OBD2 port.
- Follow the scanner’s on-screen prompts carefully to avoid accidental data loss or incorrect code clearing.
- After resetting, drive your car for a few days to confirm the light doesn’t return, indicating the issue is truly resolved.
- Regular scans can prevent future problems by catching minor issues before they become major repairs.
- Keep your Actron scanner updated with the latest software for compatibility with newer vehicle models.
How to Reset Check Engine Light with Actron Autoscanner
If your check engine light is on, it’s easy to feel overwhelmed. But don’t worry—modern tools like the Actron Autoscanner make diagnosing and resetting that pesky light simpler than ever. Whether you’re a DIY car enthusiast or just want to save a trip to the mechanic, this guide will walk you through the entire process step by step.
In this comprehensive how-to guide, you’ll learn how to safely and effectively reset your check engine light using an Actron Autoscanner. We’ll cover everything from understanding what the check engine light means, to connecting your scanner, reading diagnostic codes, clearing the light, and confirming the fix. By the end, you’ll feel confident using your Actron tool and keeping your vehicle in peak condition.
Let’s get started!
What Is the Check Engine Light?
Visual guide about How to Reset Check Engine Light with Actron Autoscanner
Image source: 2040-parts.com
The check engine light—also known as the malfunction indicator lamp (MIL)—is part of your vehicle’s onboard diagnostics system (OBD2). When it illuminates, it means the car’s computer has detected a problem with the engine, emissions system, or other critical components.
This light can come on for a wide range of reasons, from something as simple as a loose gas cap to more serious issues like a faulty oxygen sensor or catalytic converter. The good news? Most modern vehicles store a diagnostic trouble code (DTC) that tells you exactly what’s wrong.
That’s where the Actron Autoscanner comes in. This handheld device plugs into your car’s OBD2 port and reads these codes, giving you valuable insight into what’s causing the light to stay on.
Why Use an Actron Autoscanner?
Actron is a trusted name in automotive diagnostics, known for making reliable, easy-to-use scanners for both professionals and everyday drivers. Their Autoscanner line offers a range of models—from basic code readers to advanced scan tools with live data and freeze frame capabilities.
Here’s why the Actron Autoscanner is a great choice:
- Simple Operation: Most models feature a clear screen and intuitive menus, making them perfect for beginners.
- Wide Vehicle Compatibility: Works with most 1996 and newer gasoline-powered vehicles and 2000 and newer diesel vehicles.
- Code Definitions: Unlike some basic scanners, Actron devices often display plain-English explanations of trouble codes.
- Reset Functionality: You can clear codes and turn off the check engine light with just a few button presses.
- Portable and Durable: Compact design fits in your glove box for on-the-go use.
Whether you’re troubleshooting a rough idle, poor fuel economy, or just want peace of mind, the Actron Autoscanner puts powerful diagnostic tools in your hands.
What You’ll Need
Before you begin, make sure you have the following:
- Actron Autoscanner (any model in the Autoscanner series)
- Your vehicle (parked and turned off)
- Owner’s manual for your scanner (for model-specific instructions)
- A well-lit workspace (garage or driveway works best)
Optional but helpful:
- A notepad to write down trouble codes
- Internet access to look up code meanings if your scanner doesn’t provide them
- Gloves (to keep your hands clean)
Step 1: Locate the OBD2 Port
The first step in using your Actron Autoscanner is finding your vehicle’s OBD2 port. This is the connection point where the scanner communicates with your car’s computer.
Where to Look
In most vehicles, the OBD2 port is located under the dashboard on the driver’s side. It’s usually within arm’s reach of the steering wheel. Common locations include:
- Just below the steering column
- Behind a small panel or cover
- Near the center console (less common)
The port is a 16-pin connector, typically black or gray, and shaped like a trapezoid. It may be labeled “OBD2” or “DLC” (Data Link Connector).
Tip: Check Your Owner’s Manual
If you can’t find the port, consult your vehicle’s owner’s manual. It will show you the exact location. Some trucks and SUVs may have the port in the passenger footwell or under the center console.
Ensure the Port Is Accessible
Move any floor mats or clutter that might block access. You’ll need to plug the scanner in securely, so make sure there’s enough space to work comfortably.
Step 2: Turn Off the Ignition
Before connecting the Actron Autoscanner, make sure your vehicle is completely turned off. This means:
- The key is removed from the ignition (or the ignition is in the “off” position)
- All accessories (radio, lights, A/C) are turned off
- The engine is not running
Why is this important? Connecting the scanner while the ignition is on can cause electrical surges or confuse the vehicle’s computer. It’s also a safety precaution to avoid accidental starts.
Wait a Moment
After turning off the ignition, wait about 10–15 seconds before plugging in the scanner. This allows the vehicle’s systems to fully power down.
Step 3: Connect the Actron Autoscanner
Now it’s time to plug in your scanner.
Align the Connector
Take the Actron Autoscanner and locate the OBD2 cable. The connector has a trapezoidal shape that only fits one way. Match the shape of the connector to the port and gently push it in until it clicks or feels secure.
Don’t Force It
If it doesn’t go in easily, double-check the orientation. Forcing the connector can damage the pins or the port.
Secure the Connection
Once plugged in, make sure the scanner is stable. You don’t want it dangling or pulling on the port while in use. If needed, use a zip tie or Velcro strap to secure the cable to the steering column or dashboard.
Step 4: Turn the Ignition to the “On” Position
With the scanner connected, turn the ignition to the “on” position—but do not start the engine. This powers up the vehicle’s electrical system and allows the scanner to communicate with the onboard computer.
You’ll know you’re in the right position when:
- The dashboard lights up (speedometer, fuel gauge, warning lights)
- The check engine light is illuminated (this is normal)
- The engine does not crank or start
Leave the Engine Off
Do not start the engine during this process. The scanner needs to read data from the computer while the engine is off. Starting the engine can interfere with the connection or cause inaccurate readings.
Step 5: Power On the Actron Autoscanner
Now turn on your Actron scanner. Most models have a power button on the front or side. Press and hold it until the screen lights up.
Wait for Initialization
The scanner will go through a startup sequence. This may include:
- Displaying the Actron logo
- Running a self-test
- Searching for a connection to the vehicle
This process usually takes 10–30 seconds, depending on the model.
Check the Connection
If the scanner displays “No Link” or “Connection Failed,” double-check that:
- The OBD2 cable is fully plugged in
- The ignition is in the “on” position
- The scanner is compatible with your vehicle
Try unplugging and reconnecting the scanner if needed.
Step 6: Read the Diagnostic Trouble Codes (DTCs)
Once the scanner is connected and powered on, it will begin communicating with your vehicle’s computer. The next step is to read the trouble codes.
Navigate the Menu
Use the arrow buttons on the scanner to navigate the menu. Look for options like:
- “Read Codes”
- “Scan for DTCs”
- “View Fault Codes”
Select the appropriate option and press “Enter” or “OK.”
Wait for the Scan
The scanner will now retrieve stored trouble codes from the vehicle’s computer. This may take a few seconds. You’ll see a progress bar or message like “Scanning…” on the screen.
Review the Codes
Once the scan is complete, the scanner will display one or more trouble codes. These are usually in the format “P0XXX,” where “P” stands for powertrain and the numbers indicate the specific issue.
For example:
- P0420 – Catalyst System Efficiency Below Threshold
- P0171 – System Too Lean (Bank 1)
- P0302 – Cylinder 2 Misfire Detected
Write Down the Codes
Use a notepad to record each code. This is important because once you clear the codes, they will no longer appear on the scanner. You’ll need them for reference if the problem persists.
Check Code Definitions
Many Actron scanners display a brief description of each code. If yours doesn’t, you can look up the code online using free resources like OBD-Codes.com or the Actron website.
Step 7: Diagnose the Problem
Before resetting the check engine light, it’s crucial to understand what the codes mean. Clearing the light without fixing the issue is like turning off a smoke alarm while the house is still on fire.
Common Causes of Check Engine Light
Here are some typical issues associated with common codes:
- Loose or Faulty Gas Cap: Causes evaporative emissions leaks (often P0455 or P0457). Tighten or replace the cap.
- Oxygen Sensor Failure: Affects fuel mixture and emissions (P0130–P0167). Requires sensor replacement.
- Mass Airflow Sensor (MAF) Issues: Leads to poor fuel economy and rough idle (P0101–P0103). Clean or replace the sensor.
- Spark Plug or Ignition Coil Problems: Causes misfires (P0300–P0308). Replace faulty plugs or coils.
- Catalytic Converter Failure: Reduces performance and increases emissions (P0420, P0430). Often requires replacement.
When to See a Mechanic
If the code indicates a serious issue—like a catalytic converter failure or internal engine problem—it’s best to consult a professional mechanic. Some repairs require specialized tools and expertise.
DIY Fixes You Can Try
For minor issues, you may be able to fix the problem yourself:
- Tighten or replace the gas cap
- Clean the MAF sensor with MAF cleaner spray
- Replace spark plugs or ignition coils (if you’re comfortable with basic engine work)
Always refer to your vehicle’s service manual for specific instructions.
Step 8: Clear the Check Engine Light
Once you’ve diagnosed and addressed the issue (or if you’re confident it’s a minor glitch), you can reset the check engine light.
Navigate to the Clear Codes Option
On your Actron scanner, go back to the main menu and look for:
- “Clear Codes”
- “Erase DTCs”
- “Reset MIL”
Select this option and press “Enter.”
Confirm the Action
The scanner will ask you to confirm that you want to clear the codes. This is a safety feature to prevent accidental resets. Use the arrow buttons to select “Yes” or “OK” and press Enter.
Wait for Confirmation
The scanner will send a command to the vehicle’s computer to erase the stored trouble codes and turn off the check engine light. You’ll see a message like “Codes Cleared” or “MIL Reset.”
Do Not Disconnect Yet
Leave the scanner connected for a few more seconds to ensure the command is fully processed.
Step 9: Turn Off the Ignition and Disconnect
Once the codes are cleared, it’s time to disconnect the scanner.
Turn Off the Ignition
Turn the key back to the “off” position. The dashboard lights will go out.
Unplug the Scanner
Gently remove the OBD2 connector from the port. Avoid pulling on the cable—grasp the connector itself.
Store the Scanner
Wipe down the scanner with a clean, dry cloth and store it in a safe place, like your glove box or tool kit.
Step 10: Test the Reset
Now that the light is reset, you need to make sure it stays off.
Start the Engine
Turn the ignition to the “on” position and start the engine. Watch the dashboard.
Check the Check Engine Light
If the reset was successful, the check engine light should remain off. If it comes back on immediately, the problem may still exist.
Drive the Vehicle
Take your car for a short drive—about 10–15 minutes—to allow the onboard computer to run its self-tests. This is called a “drive cycle.”
During this time, the computer checks various systems (emissions, fuel, ignition, etc.) to ensure everything is working properly.
Monitor for Recurrence
If the check engine light stays off after the drive cycle, the issue is likely resolved. If it returns, the problem may be intermittent or more serious.
Troubleshooting Common Issues
Even with the right tools, things don’t always go smoothly. Here are some common problems and how to fix them.
Scanner Won’t Connect
If your Actron Autoscanner displays “No Link” or fails to connect:
- Check that the ignition is in the “on” position (engine off)
- Ensure the OBD2 cable is fully inserted
- Try a different OBD2 port (some vehicles have multiple)
- Test the scanner on another vehicle to rule out hardware issues
Codes Won’t Clear
If the scanner says “Clear Failed” or the light comes back on:
- The underlying issue may still be present—fix the problem first
- The vehicle may require a drive cycle to fully reset
- The scanner may not have the correct permissions (rare, but possible on some European or luxury vehicles)
Scanner Freezes or Turns Off
If the device becomes unresponsive:
- Turn off the ignition and disconnect the scanner
- Wait 30 seconds, then reconnect and try again
- Replace the batteries if it’s a battery-powered model
Incorrect or Incomplete Code Readings
If the codes don’t make sense or seem incomplete:
- Ensure the vehicle is compatible with the scanner
- Update the scanner’s software via Actron’s website (if supported)
- Try scanning again after a few minutes
Tips for Best Results
To get the most out of your Actron Autoscanner and ensure accurate diagnostics, follow these tips:
- Keep the Scanner Updated: Check Actron’s website periodically for firmware updates. Newer vehicles may require updated software.
- Use in a Dry Environment: Avoid using the scanner in rain or high humidity to prevent damage.
- Don’t Ignore Persistent Codes: If the same code keeps returning, it’s a sign of a real problem that needs attention.
- Combine with Regular Maintenance: Use the scanner during routine oil changes or tune-ups to catch issues early.
- Keep a Log: Record codes, dates, and repairs in a notebook or app to track your vehicle’s health over time.
Conclusion
Resetting your check engine light with an Actron Autoscanner is a straightforward process that can save you time and money. By following the steps in this guide—locating the OBD2 port, connecting the scanner, reading codes, diagnosing the issue, and clearing the light—you can take control of your vehicle’s health.
Remember, the check engine light is there to help you. Don’t just reset it and forget it. Always investigate the cause and make necessary repairs. With your Actron Autoscanner in hand, you’re equipped to handle minor issues and know when to call in a professional.
Regular use of your scanner not only keeps your car running smoothly but also gives you peace of mind on the road. So the next time that little orange light pops up, you’ll know exactly what to do.
Drive safe, stay informed, and keep scanning!