Learn how to program a Mitsubishi Attrage key using a LAUNCH X431 scanner. Step-by-step instructions, troubleshooting, and FAQs. Save time and money.

Program a Mitsubishi Attrage Key with LAUNCH X431

Last Updated: June 15, 2026

Quick Answer

You can program a Mitsubishi Attrage key using a LAUNCH X431 scanner by connecting to the OBD-II port, selecting the immobiliser function, entering the PIN (if required), and following on-screen prompts. The process requires at least one working master key and takes about 10–15 minutes. Most LAUNCH X431 models (Pro, V, PAD series) support this procedure with the latest Mitsubishi software.

Introduction

Losing your only key or needing a spare for your Mitsubishi Attrage can be frustrating. The immobiliser system built into modern Attrage models (2013 onward) prevents the engine from starting unless a properly coded key is detected. That’s where a professional diagnostic tool like the LAUNCH X431 comes in—it lets you program new keys yourself without the dealership.

The LAUNCH X431 series includes several models—X431 Pro, X431 V, X431 PAD, and others—but as long as your unit has the Mitsubishi software package installed, any of them will handle the job. The Attrage shares its platform with the Mitsubishi Mirage, so don’t worry if your scanner lists “Mirage” instead of “Attrage.” Both work identically for key programming.

If you’re comfortable following on-screen instructions and have the right equipment, you can program a new key in under 15 minutes. Let’s walk through the entire process step by step.

Prerequisites

Before you start, make sure you have the following ready:

LAUNCH X431 scanner with the latest Mitsubishi software (check for updates if you haven’t used it in a while)
Working master key (the original key that starts the engine)
New unprogrammed key (must be a compatible transponder key—typically Texas Instruments T5 or T6 chip for Attrage models)
12V battery charger or maintainer (highly recommended—low voltage can cause programming failures)
Vehicle VIN (sometimes needed to retrieve the immobiliser PIN)
Immobiliser PIN (may be required; see troubleshooting if you don’t have it)

Safety note: Keep the vehicle battery stable throughout the procedure. If your battery is weak or you’ve been running the ignition for a while, connect a charger to prevent voltage drops. A failed programming session can temporarily lock the immobiliser, requiring a dealer reset.

Step‑by‑Step Programming Process

1. Prepare the Vehicle and Scanner

Connect the LAUNCH X431 to the vehicle’s OBD-II port. This is typically located under the dashboard, left of the steering column. Once connected, turn the ignition ON using your working master key (do not start the engine). The scanner will boot up and try to establish communication with the vehicle’s ECU.

If the scanner doesn’t power on automatically, press the power button on the tablet. Wait for the main menu to appear.

2. Navigate to Mitsubishi Attrage Menu

On the scanner’s home screen, tap Diagnosis. From the list of manufacturers, select Mitsubishi, then look for Attrage. If you don’t see Attrage, select Mirage instead—they use the same immobiliser system.

You may be prompted to confirm the engine type and model year. Choose the one that matches your vehicle (e.g., 1.2L petrol, 2015). This helps the scanner load the correct diagnostic protocols.

3. Enter Immobiliser / Key Programming

After the vehicle identification, a list of systems will appear. Select Immobiliser or Anti-Theft System. The exact wording depends on your X431 software version.

Inside the immobiliser menu, look for Key Programming, Add Key, or Program Ignition Key. Tap it.

If your scanner asks for a PIN code at this point, you’ll need to enter it. This is the immobiliser PIN derived from the vehicle’s VIN. If you don’t have it, see the troubleshooting section below.

4. Follow On‑Screen Prompts

The scanner will guide you through the remaining steps. Here’s the typical flow:

The scanner will instruct you to insert the new key into the ignition and turn it to the ON position.
Remove the working key first (if still in the ignition), then insert the new key and turn it to ON.
Wait for the scanner to detect the new key and display a confirmation message.
Repeat the process for any additional keys you want to program. The Attrage immobiliser can store up to 4 keys total.

Important: Program all your keys in a single session. Any key not present during programming will be erased from the vehicle’s memory.

5. Finalise and Test

Once the scanner shows “Programming Successful” or a similar message, turn the ignition OFF and remove the key. Now test each programmed key:

Insert the key and turn to ON—the immobiliser light on the dashboard should go out after a few seconds.
Try starting the engine. It should crank and run normally.
Test the remote lock/unlock functions (note: remote fob programming is sometimes separate—see the troubleshooting section below).

Finally, clear any diagnostic trouble codes (DTCs) that may have been stored during the programming process. Use the scanner’s Read Fault Codes and Clear Codes functions under the same Immobiliser menu.

Troubleshooting Common Issues

Even with the right equipment, things can go wrong. Here are the most common problems and how to solve them.

Scanner not communicating with vehicle

Check the OBD-II cable connection first. A loose cable is the most frequent cause. If that doesn’t help, try selecting a different vehicle profile—for example, choose Mirage instead of Attrage, or try a slightly different model year. Also confirm your X431 has the latest Mitsubishi software installed (see System Update in the scanner’s settings).

PIN request and you don’t have the PIN

Many Attrage models require an immobiliser PIN during key programming. If you don’t have it, you can:

Contact a Mitsubishi dealership and provide your VIN to get the PIN (costs vary).
Use an online paid VIN-based PIN service (many are available, but verify the source).
Try common default PINs like 0000 or 1234—these rarely work on modern Attrage models, but it’s worth a quick attempt.

If all else fails, you may need a locksmith or dealer to program the key using their factory-level tools.

Key programming fails repeatedly

Low battery voltage is the #1 cause of repeated failures. Connect a battery charger and try again. Also ensure the new key is a virgin (unused) transponder key with the correct chip type. Used keys from other cars cannot be reprogrammed. If you’re using a compatible key but still failing, try a different brand of blank key—some cheap blanks don’t always match Mitsubishi’s protocol.

Old key stops working after programming

This is normal. The immobiliser system overwrites its key memory during the programming session. Any key that was not present will be erased. To keep an old key working, program it alongside the new one in the same session.

Engine starts but remote lock/unlock doesn’t work

The immobiliser programming only handles the transponder chip inside the key—not the remote fob. For the remote locking functions, you may need a separate procedure. On many Attrage models, you can program the remote by turning the ignition ON and OFF rapidly (refer to your owner’s manual for the exact sequence). If that fails, the LAUNCH X431 may have a separate Remote Key Fob Programming option under the Immobiliser menu—check for that.

Additional Tips for Success

Always use a battery maintainer. A voltage drop of just 0.5V during programming can cause the session to abort and potentially lock the immobiliser.
If you have only one working key, back it up before programming. Never lose your last master key—without it, you cannot program a new key using the scanner.
LAUNCH X431 software updates are free. Check for Mitsubishi updates periodically by connecting your scanner to Wi-Fi and running the system update tool. The latest version may include fixes for newer Attrage model years.
For 2019+ Attrage models, the immobiliser function may require an online subscription or account login. Ensure your X431 account is active and has sufficient credits if needed.
Label your new key immediately after programming. It’s easy to forget which key was the original, especially if you program multiple keys at once.

Frequently Asked Questions

Do I need a PIN to program a key with LAUNCH X431?

Most Attrage models require a PIN when using the scanner’s immobiliser function. You can obtain it from a dealer, a Mitsubishi tech service, or a paid VIN-based PIN service. Some newer models may bypass the PIN request if the scanner has online access—this varies by software version.

Can I program a used key from another car?

No—used keys carry the previous immobiliser code and cannot be reprogrammed. You must use a virgin (new) key. However, a locksmith may be able to reset a used key’s chip to a blank state, but that requires specialized equipment not available in a standard LAUNCH X431.

How many keys can I program at once?

The Attrage immobiliser supports up to 4 keys. Program all keys in a single session—any key not present during programming will be erased from the vehicle’s memory.

My LAUNCH X431 won’t find the Attrage model – what now?

Try selecting Mitsubishi Mirage (same platform). If still missing, update your X431 software: go to System Update > Car Manufacturer Database and download the latest Mitsubishi package. If you don’t have an internet connection, use a mobile hotspot to update.

Do I need an internet connection to use LAUNCH X431 for key programming?

Yes, for the initial software download and sometimes for immobiliser functions that require online authentication. Ensure a stable Wi‑Fi or hotspot before starting. The scanner itself doesn’t need constant online access during the actual programming—only for authentication steps.

What if I get “Error: Part Not Supported”?

This usually means your scanner lacks the correct software for that specific Attrage year. Contact LAUNCH support or update the Mitsubishi package. You can also try selecting a different model year (one year older or newer) as a workaround—it sometimes works.

Can I program a key without a working master?

No—the process requires at least one valid master key to authenticate the scanner. If you have no keys, you’ll need a dealer or locksmith with full access to the immobiliser system. Some high-end locksmiths can generate a master key using the vehicle’s VIN and security codes, but that’s beyond the capability of a typical LAUNCH X431.

About the Author: Erwin Salarda is an Automotive Service Equipment Technician based in the Philippines, specializing in computerized automotive diagnostic equipment such as OBD scanners and wheel alignment systems. Since 2012, he has been actively providing technical support, equipment installation, troubleshooting, after-sales service, and hands-on training for automotive service equipment used by workshops and automotive professionals.

He has received specialized training from international suppliers and manufacturers, including Launch X431 in Shenzhen, China, Lawrence Engineering Company in Guangzhou, China, and 3Excel Wheel Alignment Company in Shenzhen, China. Through these trainings, he developed advanced expertise in automotive diagnostics, calibration, wheel alignment systems, and computerized automotive service technologies.

Erwin Salarda provides professional after-sales support and technical training for automotive diagnostic and wheel alignment equipment, helping clients maximize the performance and proper use of their tools and systems. His experience covers equipment setup, software updates, calibration procedures, troubleshooting, and operational guidance for automotive workshops and service centers.

With more than a decade of experience in the automotive equipment industry, Erwin Salarda continues to support automotive businesses by delivering reliable technical expertise and practical training solutions.

For inquiries and equipment purchases, please visit https://carlifterph.com/

Program a Mitsubishi Attrage Key with LAUNCH X431 | Step-by-Step Guide