Changan Key Programming 

How to Perform IMMO Key Matching on Changan Eado Plus with LAUNCH X431

• May 31, 2026
Step-by-step guide to programming a new key for the Changan Eado Plus using a LAUNCH X431 scanner. Includes prerequisites, troubleshooting, and expert tips.

Last Updated: June 1, 2026

Quick Answer

Performing IMMO (Immobilizer) key matching on a Changan Eado Plus using a LAUNCH X431 scanner involves connecting the tool to the OBD-II port, selecting the vehicle, entering the immobilizer system, and following guided steps to program a new key. The process typically takes 10–20 minutes and requires at least one working master key. Most LAUNCH X431 variants support this procedure for models from 2018 onward, making it a practical DIY task for technicians and experienced car owners.

Prerequisites and Preparation

Before you start, gather the right tools and understand what’s required. Proper preparation prevents frustrating interruptions halfway through.

What you’ll need:

  • LAUNCH X431 diagnostic tool – Any compatible variant works (X431 PAD, PRO, V+, or similar). Ensure it has the latest software and sufficient battery charge or is connected to a power source.
  • Vehicle – Changan Eado Plus, typically model years 2020–2024. Check the exact year to avoid software mismatches.
  • Keys – At least one existing, fully functional master key. Without a master key, you’ll need dealer-level security codes or a locksmith.
  • New key blank – Must be compatible with the Eado Plus transponder system (usually ID48 or 4D chip). Using a genuine Changan spare or a high-quality verified aftermarket blank reduces failures.
  • Safe environment – Park the car in a well-ventilated area with the ignition off, all doors closed, and no aftermarket accessories (like trackers) interfering.

Also keep in mind:

  • Stable internet – The X431 may need to download the Changan vehicle software or retrieve online PIN codes. Use a reliable Wi-Fi connection.
  • No battery disconnection – Keep the car battery connected. If the battery is weak, attach a charger to prevent voltage drops during programming.

Step-by-Step Key Matching Process

Follow these steps in order. The LAUNCH X431 interface may vary slightly between software versions, but the logic remains the same.

1. Connect the LAUNCH X431 to the Vehicle

Plug the diagnostic cable into the vehicle’s OBD-II port. You’ll find it under the dashboard on the driver’s side, usually near the steering column. Turn on the X431 tablet and wait for it to boot. The tool should automatically detect the vehicle’s protocol and voltage. If prompted, select the correct regional settings (e.g., China or export market depending on your location).

2. Launch the Diagnostic Software

On the X431 home screen, tap Diagnostics. From the manufacturer list, choose Changan. Next, select Changan Eado Plus from the model options. If the exact model doesn’t appear, pick the closest variant or use the Auto Detect feature. The system will then load the vehicle’s ECU information.

Pro tip: If the X431 asks for a VIN (Vehicle Identification Number) during this step, entering it helps the tool auto-select the correct software pack.

3. Enter the Immobilizer System

Once the vehicle is identified, the X431 shows a list of available electronic systems. Tap IMMO or Immobilizer. The scanner will now communicate with the immobilizer control unit.

At this point, you may encounter one of two scenarios:

  • No security code prompt – The tool proceeds directly to the key programming menu. This happens when the X431 can automatically retrieve the PIN from its online database.
  • Security code (PIN) requested – You must enter a 4‑ or 5‑digit code. The X431 can often retrieve this code using its online PIN service (requires credits or subscription). Alternatively, contact a Changan dealer or use a professional locksmith service.

Important: If the X431 asks for a PIN and you don’t have it, do not guess. Wrong entries can lock the immobilizer temporarily.

4. Perform Key Matching

Inside the IMMO menu, look for Key Programming or Learn Key. Tap it and read the on‑screen instructions carefully. While the exact sequence may differ by software version, here is the typical procedure:

  1. Insert the existing working master key into the ignition and turn it to the ON position (do not start the engine). You should see the dashboard lights come on.
  2. Within 5 seconds, remove the master key and immediately insert the new key blank.
  3. Turn the new key to the ON position.
  4. Wait for the X431 to confirm the match. You’ll see a message like “Key added” or “Success.”

Some X431 versions guide you through a series of ignition on/off cycles. Follow each step exactly as displayed, and do not exceed the time limit between key insertions.

During the process:

  • Keep the diagnostic tool connected and powered.
  • Do not turn off the ignition or remove keys hastily.
  • If the tool instructs you to turn the ignition off, wait 5–10 seconds before turning it back on.

5. Verify the New Key

After the X431 confirms success, turn off the ignition and remove the new key. Test all its functions:

  • Remote locking/unlocking – Press the buttons on the key fob.
  • Trunk release – If the key has a trunk button, test it.
  • Engine start – Insert the new key and start the engine. The immobilizer warning light should turn off after a second or two.

If everything works, you’re done. If the engine doesn’t start or the immobilizer light stays on, proceed to the troubleshooting section below.

Troubleshooting Common Issues

Even with careful execution, you might encounter problems. Here are the most frequent ones and how to solve them.

“Security Code Requested” or “Invalid PIN”

Why it happens: The X431 cannot retrieve the PIN automatically, or the code you entered is wrong.

How to fix it:

  • Use the X431’s online PIN retrieval service (requires credits in your LAUNCH account).
  • If you have a second working master key, some X431 models can bypass the PIN requirement by copying the existing key data.
  • Contact a Changan dealer directly – they can provide the PIN with proof of ownership.
  • Hire a professional automotive locksmith equipped with dealer‑level tools.

Communication Failure or “Vehicle Not Supported”

Why it happens: Outdated software, incompatible X431 variant, or incorrect vehicle selection.

How to fix it:

  • Update the X431 firmware via Wi-Fi and reinstall the Changan software pack.
  • Try manual vehicle selection instead of “Auto Detect.” Choose the closest year and model.
  • Switch to the “16‑pin OBD” diagnostic mode if your X431 offers it.
  • Verify your X431’s compatibility with the Eado Plus – most models work on vehicles from 2018 onward.

Key Not Recognized After Programming

Why it happens: The new key blank uses a wrong transponder chip type (for example, a 4D chip when the car expects ID48).

How to fix it:

  • Confirm the correct chip type for your specific Eado Plus year. Check with a locksmith or refer to the original key’s part number.
  • Use only genuine Changan blanks or verified aftermarket ones from reputable suppliers.
  • Repeat the entire procedure from scratch – sometimes a second attempt succeeds due to timing or connection issues.

Only One Key Works After the Procedure

Why it happens: You accidentally selected “Erase All Keys” instead of “Learn Key.” This clears all existing key data from the immobilizer memory.

How to fix it:

  • You must now program all keys you want to use, including the old ones. The X431 will guide you to add keys one by one using the same “Learn Key” function.
  • Always read the on‑screen prompts carefully. If the option “Add Key” is available, choose that instead of “Replace All.”

FAQ

Q1: Can I perform IMMO key matching without a working master key?

A: No – you typically need at least one valid master key to start the procedure. If all keys are lost, you’ll need a dealer or a professional locksmith who can unlock the immobilizer using manufacturer security codes. The LAUNCH X431 with an online PIN service may help, but it still requires some form of authorized access.

Q2: Does the LAUNCH X431 support key matching for all Changan Eado Plus model years?

A: Most X431 variants support models from 2018 onward. For very new models (2023+), ensure your X431 software is up to date. If the ECU uses a newer protocol, you may need an updated firmware pack. Always check LAUNCH’s compatibility list or update before starting.

Q3: How much does the LAUNCH X431 software credit cost for key matching?

A: Costs depend on your region and subscription plan. Basic key programming is often included in the base diagnostic package. Online PIN retrieval typically costs a few dollars per use (e.g., 1–5 credits). Check your X431 account for exact pricing.

Q4: Will this process erase my existing keys?

A: Not if you choose the correct option. Select Learn Key (or Add Key) to keep existing keys and add a new one. Avoid Erase All Keys unless you intentionally want to start from scratch. Read the on-screen prompts – they clearly label each function.

Q5: Can I program a remote control (key fob) separately using the same process?

A: Some X431 IMMO menus include a separate Remote Key Programming function. This programs the key fob’s lock/unlock functions separately from the transponder chip. The procedure may involve pressing door lock buttons in a specific sequence. If the tool doesn’t offer this, the remote usually syncs automatically when you program the transponder chip.

Q6: Why does my X431 show “Operation Failed” even after following instructions?

A: Common reasons include:

  • Weak battery in the new key blank – replace it with a fresh one.
  • Poor OBD connection – wiggle the plug or try another port if available.
  • Interference from aftermarket electronics like alarms or GPS trackers. Disconnect them temporarily.
  • Exceeding the time limit between key insertions. Restart the process and move faster. If the problem persists, update the X431 software and retry.

Q7: Do I need to disconnect the car battery before starting?

A: No – keep the battery connected. However, if the car battery is low, attach a charger to prevent voltage dips that could interrupt programming. Disconnecting the battery may reset electronic modules and complicate the procedure.

Final Tips

  • Test all keys immediately – Keep the X431 connected until you confirm both old and new keys start the engine and operate the remote functions. If something fails, you can repeat the procedure right away.
  • Document your key type – Note the transponder chip type (ID48 or 4D) and the key’s part number. That information saves time if you need a replacement later.
  • Update your X431 regularly – Changan frequently releases software patches that improve compatibility and add diagnostic functions. Keep your tool current.
  • Work methodically – Rushing leads to mistakes like selecting the wrong menu option or inserting keys too slowly. Stay calm and follow the on‑screen guide step by step.

Performing IMMO key matching on a Changan Eado Plus with a LAUNCH X431 is a rewarding skill that saves you time and money compared to dealer visits. With the right preparation and attention to detail, you can program new keys confidently.

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/

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