Learn to program a Mitsubishi Colt CZ3 or CZT key using LAUNCH X431. Step-by-step guide, PIN code requirement, troubleshooting tips, and cost savings.

How to Program a Mitsubishi Colt CZ3 or CZT Key with LAUNCH X431

Published: June 15, 2026

Quick Answer: Key Takeaways

Programming a Mitsubishi Colt CZ3 or CZT key using a LAUNCH X431 requires a working key, the scanner with Mitsubishi software, and the 4-digit immobilizer PIN code. You connect the X431, navigate to the Immobilizer menu, enter the PIN, and follow on‑screen prompts to add a new transponder key. The entire process takes about 15–30 minutes and can save you $75–$300 compared to dealer or locksmith fees. Important: The LAUNCH X431 cannot read the PIN for this model—you must already have it.

Understanding the Mitsubishi Colt CZ3/CZT Immobilizer System

The Colt CZ3 (three‑door hatchback) and CZT (turbocharged variant) use a standard Mitsubishi immobilizer system that relies on a transponder chip inside the key. The chip communicates with the engine control unit (ECU) when you turn the ignition to ON. If the chip’s code doesn’t match the ECU’s stored codes, the engine won’t start.

Transponder vs. Remote: The immobilizer only controls engine start. Door lock/unlock uses a separate remote control unit that operates on a rolling code. The LAUNCH X431 can program the transponder but not the remote. You’ll need to perform a separate manual synchronization for the remote after key programming.
Why the PIN is Essential: Mitsubishi locks the immobilizer programming session behind a 4‑digit security code (PIN). This prevents unauthorized key duplication. Entering the wrong PIN multiple times will lock the system for 10–30 minutes, so accuracy matters.
When is Key Programming Needed?
- Adding a spare key
- Replacing a lost or damaged key
- After replacing the ECU or immobilizer unit
- (Rarely) after a full battery disconnect that wipes key memory

Prerequisites Before You Begin

Hardware & Software

A LAUNCH X431 scanner (X431 V, Pro, Pad, Diagun, or any model with Mitsubishi software). Make sure the software is up‑to‑date.
OBD2 extension cable (optional, makes it easier to work in the driver’s seat).
A battery charger or jump pack if your vehicle’s battery voltage is below 12.5V.

Keys Required

At least one existing working key that starts the engine. For “all keys lost” situations, you’ll need a new key already cut to match your ignition lock (the X431 cannot cut keys).
A blank key with the correct transponder chip. The CZ3/CZT typically uses a Philips ID46 (T5) chip. Some early models use ID47. Check your original key with a transponder tester or compare the chip shape.

Security Code (PIN)

The 4‑digit PIN is usually on a white plastic card that came with the vehicle’s owner’s manual. If you don’t have it, check dealer records (provide your VIN) or use a dedicated PIN reader tool. The standard LAUNCH X431 cannot read the immobilizer PIN for the Colt. You’ll need a separate tool like the X431 X‑PROG3, X100 Pro, or a standalone PIN reader.
If all else fails, a locksmith can often retrieve the PIN for a fee.

Step-by-Step Guide: Programming a Mitsubishi Colt CZ3/CZT Key with LAUNCH X431

Step 1: Prepare the Vehicle

Make sure the battery voltage is stable. If the car has been sitting, connect a charger.
Close all doors, the trunk, and the hood.
Gather your keys: working key, new blank key, and the PIN code.
Insert the working key into the ignition and turn it to the ON position (position II). Do not start the engine.

Step 2: Connect the LAUNCH X431

Plug the OBD2 connector into the vehicle’s diagnostic port (under the driver’s side dashboard, near the fuse panel).
Power on the X431 tablet. Wait for the system to boot.
The X431 may auto‑detect the vehicle via VIN. If it doesn’t, select manually:
- Mitsubishi → Colt → choose the model year (2008–2014 covers most CZ3/CZT).
- Select the correct engine (1.3L or 1.5L petrol).

Step 3: Navigate to Immobilizer Functions

From the main diagnostic menu, tap Immobilizer (sometimes labeled Anti‑Theft or Security).
The scanner will read the immo system. You’ll see a menu with options like:
- Read ECU Information
- Enter Security Code
- Key Programming
- Add Key
- Delete Keys

Step 4: Enter the Security Code (PIN)

Select Enter Security Code or Unlock System.
Using the on‑screen keyboard, input your 4‑digit PIN.
Some X431 models ask you to confirm the code by entering it a second time.
After submission, the screen should display “Security Access Allowed”. If you get “Access Denied”, the PIN is wrong or the system is in a lockout period. Wait 10 minutes (or up to 30 minutes) before retrying.

Step 5: Program the New Key

Once security access is granted, choose Add Key or Key Programming.
The X431 will prompt you to insert the new key. First, remove the working key from the ignition.
Insert the new key (blade must already be cut to match the ignition) and turn it to the ON position within 20 seconds.
The scanner will now communicate with the transponder chip. This takes about 5–10 seconds.
Wait for the confirmation message: “Key Programmed Successfully”.
Remove the new key. Reinsert the working key and turn it to ON to verify it still works.

Step 6: Test All Keys

Try starting the engine with the new key. It should crank and run normally.
Test the remote control functions (lock/unlock). The LAUNCH X431 does not program the remote, so you’ll need to sync it manually (see “Additional Tips” below).

Step 7: Clear Codes & Exit

Use the X431 to clear any immobilizer‑related fault codes (e.g., U0100 or B1600).
Turn off the ignition and disconnect the scanner.

Troubleshooting Common Issues

Problem	Possible Cause	Solution
X431 cannot communicate with immobilizer	Wrong vehicle selection; poor OBD2 connection	Manually re‑select Mitsubishi > Colt > 2009. Check OBD2 pins for debris. Try a different OBD2 cable.
“Security Access Denied”	Incorrect PIN or system locked after too many wrong attempts	Wait 10–30 minutes. Double‑check your PIN source. Use a PIN reader if you’re unsure.
Key programmed but engine won’t start	Transponder chip not recognised; key blade not properly cut	Verify the chip type (ID46/47). Repeat the procedure. Ensure the key is turned fully to ON.
Only the working key works after programming	You accidentally selected “Delete All Keys” instead of “Add Key”	Reprogram both keys together. The X431 will let you add them one after another.
X431 shows “Function not supported”	Outdated software; immobilizer system not in the database	Update your LAUNCH X431 firmware and Mitsubishi software. Try using a higher‑end model (X431 Pad).

Additional Tips for Professional Results

Always keep at least two working keys. If you accidentally delete all keys from the ECU, you’ll be locked out and will need a dealer to recover access.
Store your PIN code securely — not in the glovebox or on the key ring. A password manager or a note in your home safe is better.
For “all keys lost” scenarios: You must have a physical key cut to your ignition lock. A locksmith can cut a key using the vehicle’s VIN. Without a working key to start the ignition, the X431 cannot help you until the blade is ready.
Remote programming after transponder programming: To sync the remote control, sit in the driver’s seat with all doors closed. Insert the key into the ignition. Turn it ON and back OFF rapidly (within 10 seconds). Remove the key. Press and hold the lock or unlock button on the remote for 5 seconds. Repeat for each remote. If this doesn’t work, consult your owner’s manual for the exact procedure, as it can vary by model year.

Frequently Asked Questions (FAQ)

Q1: Can the LAUNCH X431 read the PIN code directly from my Colt CZ3?

No. Standard LAUNCH X431 diagnostic scanners (V, Pro, Pad, etc.) cannot read the immobilizer PIN. You need a special tool like the X431 X‑PROG3, X100 Pro, or a standalone PIN reader. If you don’t have the PIN, the X431 will not help you program a key.

Q2: What transponder chip does a Mitsubishi Colt CZ3/CZT use?

Most models from 2008 to 2014 use a Philips ID46 (also called T5) chip. Some early units may use ID47. To be sure, test your existing key with a transponder tester, or look at the chip shape — ID46 chips are usually rectangular, while ID47 are slightly different.

Q3: Do I need two existing keys to program a third with the LAUNCH X431?

No. You only need one working key and the PIN code. The X431 can add a new key without requiring a second existing key. You’ll remove the working key when programming the new one.

Q4: What if my LAUNCH X431 says “Immobilizer not found”?

First, confirm your Colt actually has an immobilizer — all CZ3/CZT models do. Then update your X431 software to the latest version. Also try selecting the vehicle manually using the VIN instead of relying on auto‑detection.

Q5: Can I program a used key from another Colt?

Yes, as long as the transponder chip is unprogrammed. If the chip was previously programmed to another vehicle, you must erase it first using a dedicated transponder programmer (like the X431 X‑PROG3 or a universal chip tool). The X431 alone cannot erase a used chip.

Q6: How much does a LAUNCH X431 key programming service typically cost?

If you own the tool, the cost is just the price of a blank key ($10–$30). Locksmiths charge $75–$150 for this service. Dealerships often charge $150–$300. DIY programming with the X431 pays for itself after one or two jobs.

Q7: Why did my new key program but the remote doesn't work?

The X431 only programs the immobilizer (transponder). The remote control uses a separate rolling code system. Try the manual synchronization procedure described in the “Additional Tips” section. If that fails, the remote battery might be dead, or the remote itself could be faulty.

Conclusion: Save Money with DIY Key Programming

Programming a Mitsubishi Colt CZ3 or CZT key with a LAUNCH X431 is a straightforward, money‑saving job if you have the PIN code and a properly cut blank key. The process takes less than half an hour and requires no special tools beyond the scanner and the correct chip. Just remember that remote programming is a separate manual step, and that the X431 cannot retrieve your PIN. Keep that code safe, and you’ll be able to add spare keys for years to come.

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/

How to Program a Mitsubishi Colt CZ3/CZT Key with LAUNCH X431