This guide teaches you how to clear check engine light codes with Autolink AL319 safely and effectively. Whether you’re a first-time user or a seasoned DIYer, you’ll learn the right steps, common pitfalls to avoid, and how to interpret your results. Clear codes with confidence using this simple, proven method.
Key Takeaways
- Understand the Autolink AL319: A compact, user-friendly OBD2 scanner that reads and clears check engine light codes on most 1996 and newer vehicles.
- Safe code clearing process: Always diagnose the root cause before clearing codes to avoid recurring issues and potential damage.
- Step-by-step procedure: Connect, power on, read codes, review data, clear codes, and verify the light is off.
- Compatible vehicles: Works with gasoline, diesel, and hybrid vehicles equipped with OBD2 ports (standard in the U.S. since 1996).
- Interpret codes correctly: Use the AL319’s built-in code definitions or online databases to understand what each code means.
- Troubleshooting tips: If the light returns, recheck for active codes and inspect related systems like oxygen sensors or fuel injectors.
- Maintenance reminder: Regular scanning helps catch issues early, improving fuel efficiency and engine performance.
How to Clear Check Engine Light Codes with Autolink AL319
If your car’s check engine light is on, it’s easy to feel overwhelmed. But thanks to tools like the Autolink AL319 OBD2 scanner, you don’t need to rush to a mechanic. This affordable, handheld device lets you read and clear diagnostic trouble codes (DTCs) from your vehicle’s onboard computer—right from your driveway.
In this comprehensive guide, we’ll walk you through how to clear check engine light codes with Autolink AL319 in 2026. Whether you’re a beginner or a DIY enthusiast, you’ll learn the correct steps, safety tips, and troubleshooting advice to get your car back in top shape. We’ll cover everything from setup to verification, so you can use the AL319 with confidence.
By the end of this guide, you’ll know how to:
- Connect the Autolink AL319 to your vehicle
- Read and interpret diagnostic trouble codes
- Clear the check engine light safely
- Verify that the issue is resolved
- Troubleshoot if the light comes back on
Let’s get started.
What Is the Autolink AL319?
Visual guide about How to Clear Check Engine Light Codes with Autolink Al319
Image source: img.pacifiko.com
The Autolink AL319 is a compact, handheld OBD2 (On-Board Diagnostics II) scanner designed for everyday drivers and DIY mechanics. It plugs directly into your vehicle’s OBD2 port—usually located under the dashboard near the steering wheel—and communicates with the car’s computer system.
This device can:
- Read diagnostic trouble codes (DTCs)
- Display live sensor data (like engine RPM, coolant temperature, and fuel trim)
- Clear check engine light codes
- Show freeze frame data (a snapshot of engine conditions when the code was set)
It’s compatible with most gasoline, diesel, and hybrid vehicles made in 1996 or later in the U.S., and 2001 or later in Europe. The AL319 doesn’t require batteries—it draws power directly from the OBD2 port—and features a clear LCD screen with easy-to-navigate menus.
One of its standout features is the built-in code library, which provides plain-English explanations for common trouble codes. This makes it ideal for users who aren’t familiar with technical jargon.
Why Clear the Check Engine Light?
The check engine light (CEL) is your car’s way of saying, “Something’s not right.” It could be a minor issue like a loose gas cap or something more serious like a failing catalytic converter.
Clearing the light doesn’t fix the problem—but it does reset the system so you can see if the issue returns. Here’s why you might want to clear the code:
- After repairs: Once you’ve fixed the issue, clearing the code turns off the light.
- Before an emissions test: Many states require a clean OBD2 system to pass inspection.
- To reset the system: Sometimes, the light stays on even after the problem is resolved.
- To monitor performance: Clearing codes lets you track if a new issue appears.
However, never clear the code without diagnosing the problem first. If the underlying issue isn’t fixed, the light will likely come back—and you could risk further damage.
Before You Begin: Safety and Preparation
Before using the Autolink AL319, take a few minutes to prepare. This ensures a smooth, safe process.
1. Park Your Vehicle Safely
- Turn off the engine and remove the key.
- Park on a flat, level surface.
- Engage the parking brake.
- Ensure the area is well-lit and ventilated.
2. Locate the OBD2 Port
The OBD2 port is usually found under the dashboard, near the driver’s side. Common locations include:
- Below the steering wheel
- Behind a small cover or panel
- Near the fuse box
If you can’t find it, consult your vehicle’s owner’s manual. The port is a 16-pin connector and looks like a trapezoid.
3. Check Your Vehicle Compatibility
The AL319 works with:
- Gasoline vehicles (1996 and newer in the U.S.)
- Diesel vehicles (2001 and newer in the U.S.)
- Hybrid and electric vehicles with OBD2 ports
It does not work with pre-1996 vehicles or some European models before 2001.
4. Charge Your Phone (Optional)
While the AL319 has a built-in code library, you may want to use your phone to look up less common codes online. Make sure your phone is charged or bring a power bank.
Step-by-Step: How to Clear Check Engine Light Codes with Autolink AL319
Now that you’re prepared, let’s go through the process step by step.
Step 1: Connect the AL319 to the OBD2 Port
- Take the Autolink AL319 out of its packaging.
- Locate the OBD2 port in your vehicle.
- Plug the AL319 into the port firmly. It should click into place.
- Make sure the device is seated properly—loose connections can cause errors.
Step 2: Turn On the Ignition
- Do not start the engine yet.
- Turn the key to the “ON” position (also called “ignition on” or “key on, engine off”).
- This powers up the vehicle’s computer and allows the AL319 to communicate with it.
You’ll see the AL319’s screen light up. It may display “Autolink” or “AL319” during startup.
Step 3: Wait for the Device to Initialize
- The AL319 will automatically detect your vehicle’s protocol (e.g., CAN, ISO9141, etc.).
- This may take 10–30 seconds.
- Once connected, the main menu will appear.
If the screen stays blank or shows “No Data,” check the connection and ensure the ignition is on.
Step 4: Read the Diagnostic Trouble Codes (DTCs)
- Use the arrow buttons to navigate to “Read Codes” or “DTCs.”
- Press the “Enter” or “OK” button.
- The device will scan the system and display any stored codes.
Codes typically appear in the format “P0xxx” (e.g., P0420). Each code corresponds to a specific issue.
Step 5: Interpret the Codes
The AL319 will show a brief description of each code. For example:
- P0420 – Catalyst System Efficiency Below Threshold
- P0171 – System Too Lean (Bank 1)
- P0302 – Cylinder 2 Misfire Detected
If the description is unclear, use the device’s built-in help menu or search the code online. Websites like OBD-Codes.com provide detailed explanations and repair tips.
Step 6: Review Freeze Frame Data (Optional but Recommended)
Freeze frame data shows the engine conditions when the code was set. This can help you understand what triggered the issue.
- Navigate to “Freeze Frame” or “View Data.”
- Review parameters like engine speed, load, temperature, and fuel trim.
For example, if the engine was under heavy load when a misfire occurred, it might point to a fuel delivery problem.
Step 7: Clear the Codes
Now that you’ve reviewed the codes, it’s time to clear them.
- Go back to the main menu.
- Select “Clear Codes” or “Erase DTCs.”
- Press “Enter” or “OK.”
- Confirm the action when prompted (usually by pressing “Yes” or “OK” again).
The AL319 will send a command to the vehicle’s computer to erase the stored codes. This may take a few seconds.
Step 8: Turn Off the Ignition
- Once the codes are cleared, turn the key back to the “OFF” position.
- Wait 10–15 seconds.
- Unplug the AL319 from the OBD2 port.
Step 9: Start the Engine and Check the Light
- Start your vehicle.
- Observe the dashboard.
- If the check engine light is off, the codes have been successfully cleared.
If the light remains on, it may indicate:
- The problem wasn’t fixed
- A new code was set immediately
- The vehicle’s computer hasn’t completed its self-tests
What to Do If the Light Comes Back On
Clearing the code doesn’t guarantee the problem is solved. If the check engine light returns, follow these steps:
1. Reconnect the AL319
- Plug the scanner back in.
- Turn the ignition on.
- Read the codes again.
2. Compare New and Old Codes
- Are the same codes appearing?
- Are new codes present?
Recurring codes suggest the issue wasn’t resolved. For example, a P0420 code that keeps returning likely means the catalytic converter is failing and needs replacement.
3. Inspect Related Systems
Use the code description to guide your inspection. For example:
- P0171 (System Too Lean): Check for vacuum leaks, dirty mass airflow (MAF) sensor, or faulty fuel injectors.
- P0302 (Cylinder 2 Misfire): Inspect spark plugs, ignition coils, and fuel delivery to that cylinder.
- P0442 (Evaporative Emission Control System Leak): Check the gas cap, EVAP hoses, and purge valve.
4. Perform Repairs or Seek Professional Help
If you’re not comfortable making repairs, take your vehicle to a trusted mechanic. Bring a printout or photo of the codes to help them diagnose the issue faster.
Tips for Using the Autolink AL319 Effectively
To get the most out of your AL319, keep these tips in mind:
1. Use It Regularly
Even if the check engine light isn’t on, scanning your vehicle every few months can catch early signs of trouble. Think of it like a health checkup for your car.
2. Keep a Log of Codes
Write down or take photos of any codes you encounter. Over time, this log can help you spot patterns—like recurring misfires or sensor failures.
3. Update the Device (If Possible)
While the AL319 doesn’t support firmware updates, newer models may. Check Autolink’s website for any software enhancements or compatible accessories.
4. Store It Properly
Keep the AL319 in a dry, cool place. Avoid extreme temperatures, which can damage the screen or internal components.
5. Use Live Data for Diagnostics
The AL319 can display real-time sensor readings. For example:
- Check oxygen sensor voltage to see if it’s switching properly.
- Monitor fuel trim to detect lean or rich conditions.
- Watch engine RPM and coolant temperature for anomalies.
This data can help you pinpoint issues before they trigger a code.
Troubleshooting Common Issues
Even with a reliable tool like the AL319, you might run into problems. Here’s how to fix them:
Problem: AL319 Won’t Turn On
- Check that the ignition is on.
- Ensure the OBD2 port is clean and undamaged.
- Try a different vehicle to test the scanner.
Problem: “No Data” or “Link Error” Message
- Reconnect the AL319 firmly.
- Make sure the vehicle is OBD2-compliant.
- Try turning the ignition off and on again.
Problem: Codes Won’t Clear
- The issue may still be active. Fix the problem first.
- Some codes require drive cycles to clear. Drive the vehicle for 20–50 miles and recheck.
Problem: Check Engine Light Returns Immediately
- This usually means the fault is still present.
- Re-scan and address the root cause.
When to See a Mechanic
While the AL319 is a powerful tool, it has limits. See a professional if:
- You’re unsure how to interpret or fix a code
- The vehicle has multiple or severe codes (e.g., P0300 random misfire)
- You suspect transmission, ABS, or airbag issues (the AL319 only covers engine and emissions)
- The problem involves complex electrical or mechanical repairs
A good mechanic can perform advanced diagnostics, such as scope testing or pressure checks, that go beyond what an OBD2 scanner can do.
Conclusion
Clearing check engine light codes with the Autolink AL319 is a simple, effective way to take control of your vehicle’s health. By following this guide, you’ve learned how to connect the scanner, read codes, interpret results, and safely clear the light—all from the comfort of your garage.
Remember, the AL319 is a diagnostic tool, not a repair tool. Always address the underlying issue before clearing codes. Regular scanning can help you catch problems early, save money on repairs, and keep your car running smoothly.
In 2026, with more vehicles relying on advanced electronics, tools like the AL319 are more valuable than ever. Whether you’re prepping for an emissions test, troubleshooting a rough idle, or just curious about your car’s performance, this scanner puts powerful diagnostics in your hands.
So the next time that check engine light comes on, don’t panic. Grab your Autolink AL319, follow these steps, and drive with confidence.