Mechanic Wiki: How to Add a Spare Key to a Mitsubishi Chariot with LAUNCH X431

Learn to program a spare key for a Mitsubishi Chariot using a LAUNCH X431 scanner. Step-by-step guide, tools needed, troubleshooting, and FAQs.

Quick Answer

To add a spare key to a Mitsubishi Chariot using a LAUNCH X431, you need a compatible blank transponder key (usually ID47 or ID4C) and a LAUNCH X431 scanner with immobilizer (IMMO) software. The process involves connecting the tool, identifying the vehicle, reading the immobilizer system, selecting the “Key Learning” or “Add Key” function, and following on-screen prompts. You must have at least one working key or the security PIN code. The entire procedure takes about 10–15 minutes.

Tools and Preparation Needed

Before you start, gather these essentials:

Blank transponder key – Check your Chariot’s year and model. Most 1999–2005 models use an ID47 chip; some later models use ID4C. Using the wrong chip type will cause the programming to fail.
LAUNCH X431 scanner – Any version with IMMO and Mitsubishi software works (e.g., X431 PRO, V+, PAD series). Make sure you have the latest Mitsubishi software update installed.
Vehicle battery in good condition – A low battery can interrupt the programming and even damage the immobilizer system.
Existing working key – Required for the “Add Key” method. If you have no working key, you’ll need the vehicle’s immobilizer PIN code.
PIN code (if needed) – Sometimes found on a sticker behind the glovebox, on the immobilizer ECU, or available from a Mitsubishi dealer.

Having the owner’s manual or a service data sheet for your Chariot handy can help locate the PIN or verify correct procedures.

Step-by-Step Key Programming Process

Follow these numbered steps carefully. The LAUNCH X431 screen may vary slightly between software versions, but the general flow remains the same.

Vehicle Identification and Connection

Turn the ignition off and insert your existing working key into the ignition cylinder.
Connect the LAUNCH X431 to the vehicle’s OBD-II port, typically located under the dashboard near the steering column.
Power on the LAUNCH X431 and select Mitsubishi from the vehicle brand menu.
Choose the correct model and year: navigate to Mitsubishi → Chariot. If Chariot is not listed, try Space Wagon – that’s the export name for the same vehicle. Verify the engine and transmission type to ensure the software selects the right immobilizer system.

Enter Immobilizer Menu

From the main diagnostic menu, select Immobilizer (IMMO) or Anti-Theft System. The tool will communicate with the vehicle’s immobilizer control unit.
Wait for the tool to read the system – it will display the current key status, including how many keys are already programmed.
Select Key Programming or Key Learning (the exact wording depends on your X431 software pack).

Programming a New Spare Key

If the X431 prompts for a PIN code:
- Retrieve the PIN from the dealer, from a factory sticker (sometimes behind the glovebox or on the immobilizer ECU), or use the “Read PIN” function if your tool supports it.
- Enter the 4-digit PIN when requested. An incorrect PIN will abort the procedure.
Choose the function – If the tool offers Add Key, select it. If not, choose Program New Key or Key Learning.
Insert the new blank transponder key into the ignition and turn it to the ON position (the dashboard lights come on, but do not crank the engine).
Follow the on-screen instructions – The X431 may ask you to wait for a beep, turn the key off and on, or press the brake pedal. Follow each prompt precisely and within the given time window.
When the tool confirms “Programming Successful”, remove the new key from the ignition.

Confirm Programming

Turn off the ignition, wait about 10 seconds, then start the engine with each programmed key – both the old and the new one.
If only the new key works, repeat the procedure to re-sync the existing key. Some Mitsubishi systems require that all keys be learned together in one session when using “Key Learning” instead of “Add Key.”

Troubleshooting Common Issues

Even with careful steps, problems can arise. Here’s what to do when they do.

“No Communication with Immobilizer” Error

Check the OBD-II connection – re-seat the plug or try a different cable if available.
Ensure the ignition is in the ON position when the tool attempts communication.
Verify your LAUNCH X431 has the latest Mitsubishi software update – outdated firmware often causes communication issues.

X431 Does Not Show “Add Key” Option

Some Chariot years require the “All Keys Lost” procedure if no working key exists.
If you have one working key, select Key Learning instead – it may program additional keys in a batch, but note that it typically erases all previously stored keys.
Check the vehicle’s service manual; some models need a dealer-level tool or a specific PIN method.

New Key Does Not Start the Engine

Wrong transponder type – Confirm your blank key is ID47 (for 1999–2004 models) or ID4C (later models). You can verify by holding the key near a compatible RFID reader or by checking against your VIN.
Incomplete programming – Repeat the steps and follow the exact timing. For example, some systems require the key to stay in the ON position for at least 5 seconds.
Poor-quality blank key – Some aftermarket blanks are not recognized. Use a genuine Mitsubishi key or a high-quality replacement from a trusted supplier.

Lost All Keys – Cannot Get PIN

Retrieve the PIN from the immobilizer ECU – often located behind the glovebox or under the dashboard. The PIN is usually a 4-digit number stamped on a sticker, sometimes covered by a blank label.
Use a specialized PIN code retrieval tool – some LAUNCH X431 modules include a “Read PIN by VIN” function that requires an online connection.
Contact a Mitsubishi dealer – provide your VIN and proof of ownership to obtain the PIN.

Important Tips and Precautions

Taking a few extra precautions can save you time and frustration.

Battery voltage – If the vehicle battery is weak, keep the engine running during programming. Ensure the transmission is in Park or Neutral and the parking brake is engaged.
Timeout windows – The immobilizer system may time out after 30 seconds. Keep the X431 screen active and respond to prompts quickly.
Number of keys – The Chariot immobilizer stores up to 4 keys. When using “Key Learning” (not “Add Key”), programming a new key often erases all previous keys. You must then program all keys you intend to use in that single session.
Software version – Always update your LAUNCH X431 to the latest firmware and Mitsubishi software pack. Older versions may not support Chariot models after a certain year.

Frequently Asked Questions

Can I program a spare key for my Mitsubishi Chariot without a working key?

Yes, but you will need the vehicle’s immobilizer PIN code and the LAUNCH X431’s “All Keys Lost” function. If you don’t have the PIN, you must obtain it from a dealer or retrieve it from the immobilizer unit.

Why does my LAUNCH X431 say “Incorrect PIN”?

The PIN you entered may be wrong. Double-check the code from the dealer or the ECU sticker. Note that some models use a 5-digit PIN or require a PIN plus a master key code.

Can I use any blank transponder key?

No. The Mitsubishi Chariot uses a specific transponder chip (usually ID47 for 1999–2004 models, later models may use ID4C). Chips must be compatible with the immobilizer frequency (125 kHz). Using the wrong chip will result in a failed programming.

How many keys can I program at once?

The Chariot immobilizer stores up to 4 keys. If you use “Key Learning” (not “Add Key”) you must program all keys you intend to use in one session. If you only add one, the old keys may be erased.

Does the LAUNCH X431 support all Mitsubishi Chariot years?

Most X431 models with the Mitsubishi software cover 1996–2010 vehicles. Check the software coverage list on your tool or launch the diagnostic to confirm communication.

I programmed the key successfully but the engine still won’t start. What now?

Check that the key transponder is physically intact (no damage). Also, verify that the immobilizer light on the dashboard turns off after key insertion. If the light stays on, the key may not be fully recognized. Try re-programming with a new blank key from a trusted source. For more tips, see our guide on [link to related guide on troubleshooting immobilizer programming].

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/

Published: June 15, 2026