How to Perform Anti-Theft Password Reading & Key Matching on a Chery QQ (LAUNCH X431 Guide)

Last Updated: June 15, 2026

Quick Answer: Can the LAUNCH X431 Program a Chery QQ Key?

Yes. A LAUNCH X431 scanner (like the X431 V+ or PAD VII) can read the 4-digit anti-theft password and program a new ignition key for a Chery QQ. The process involves connecting the tool, reading the immobilizer (IMMO) data for the security code, and then using the key programming function to add the new transponder. You will need a blank, uncut key compatible with the Chery QQ’s transponder chip (usually T5 or 46 type). If the password reading fails, you must manually retrieve it from the ECU dump or contact a specialized IMMO service.

Understanding the Chery QQ Immobilizer System

What is the Anti-Theft Password?

Every modern vehicle has an electronic immobilizer that prevents the engine from starting unless the correct key is detected. On the Chery QQ, this system stores a unique security code—typically a 4-digit number—inside both the Engine Control Unit (ECU) and the Immobilizer (IMMO) box. The LAUNCH X431 communicates with the IMMO module through the OBDII port and retrieves this code so that you can authorize a new key.

Think of it as a secret handshake between the car and the key. Without that code, the engine simply cranks but never fires. The X431 gives you direct access to read that handshake and add a new key to the car’s “approved list.”

Why the LAUNCH X431 is Preferred

• Direct data reading from the IMMO box: No need to remove the dashboard or desolder chips on many 2003–2010 Chery QQ models.
• Password retrieval via OBDII: In most cases, the 4-digit code appears on the screen without manual chip extraction.
• One-tool solution: The same scanner handles diagnostic scanning, IMMO service, and key learning—no separate key programmer is required for this specific model.

Prerequisites and Preparations

Before you jump into programming, gather the following items and confirm your vehicle is ready.

Pro tip: Always test the new blank key with a transponder chip reader before attempting programming. It is frustrating to spend an hour only to discover the chip is defective or the wrong type.

Step-by-Step Process: Reading the Password & Matching the Key

Step 1: Connect and Enter IMMO System

1. Connect your LAUNCH X431 scanner to the OBDII port located under the dashboard (driver’s side). The scanner will power on automatically.
2. Turn the ignition key to the ON position (engine off). Do not start the engine.
3. On the X431 screen, select Diagnosis > Chery > Chery QQ > System Selection.
4. From the system list, choose Immobilizer System (sometimes labeled “IMMO” or “Engine Anti-Theft”).

What you should see: The scanner will connect to the IMMO module and display the vehicle identification (e.g., IMMO number, software version). If the connection fails, recheck your OBDII cable and ignition status.

Step 2: Read the Anti-Theft Password (The Critical Step)

This is where most of the magic—and the potential frustration—happens.

1. Navigate to Special Functions > Read Password > Read Security Code.
2. The scanner will communicate with the IMMO box. After a few seconds, a 4-digit number should appear on the screen (for example, 1234). Write down this code exactly as displayed.
3. Troubleshooting: If the screen shows FFFFFFFF, 0000, or an error code like 0000 0000 00, the password is encrypted. In this case, proceed to Step 4 (Troubleshooting) below. Do not attempt key matching with a false password—it will fail.

Step 3: Match the New Key (Add Key Mode)

Assuming you successfully read the password, follow these steps to program the new key.

1. Return to the Special Functions menu and select Key Learning > Add Key.
   • Important: Choose “Add Key,” not “Replace All Keys,” unless you have lost all existing keys. The “Replace All” function erases all programmed keys and requires the password again.
2. Input Password: Enter the 4-digit security code from Step 2. Confirm the entry.
3. Insert Key (Follow On-Screen Instructions): The X431 will prompt you to insert the new transponder key into the ignition. Place it in the ignition lock and turn it to the ON position (engine off).
4. Wait for Confirmation: The scanner will write the transponder data. The IMMO light on the dashboard (usually a car icon with a key symbol) will turn off or stop flashing once the programming is successful. This typically takes 10–30 seconds.
5. Test the Key: Turn off the ignition, remove the new key, and insert it again. Start the engine. If it starts and runs normally, the key is matched.
6. Program Additional Keys (Optional): You can usually match up to 4 keys in one session. Repeat the “Add Key” procedure with each remaining key before exiting the IMMO menu.

Deep Dive: Troubleshooting Common Failures

Even with a good tool, things can go sideways. Here are the most frequent issues and how to solve them.

Problem 1: “Password Read Failed” or “Cannot Connect to IMMO”

• Cause: The immobilizer box is dead, there is a bad ground connection, or the ECU has a specific software lock that prevents OBDII reading.
• Fixes:
  1. Check the IMMO antenna ring around the ignition lock. A damaged ring can prevent communication even if the box is alive.
  2. Perform a hard reset: Disconnect the battery negative terminal. Wait 15 minutes. Reconnect, then try reading the password again. This clears transient glitches in the IMMO module.
  3. Manual method (EEPROM dump): If OBDII reading still fails, the password is often stored on a 93C46 or 24C02 EEPROM chip inside the IMMO module. You can remove the IMMO box (located behind the glove box or under the dashboard), read the chip with a programmer such as XPROG or Tango, and extract the 4-digit code from the dump. This is an advanced step—only attempt if you are comfortable with soldering and chip reading.

Problem 2: Key Learning Error – “Key Code Error”

• Cause: The blank key uses the wrong transponder chip type. For example, you are trying to program a T5 chip into a car that expects a 46 chip, or vice versa.
• Fix: Verify the chip type. Look at your original key’s head—if it has a metal tip and a visible transponder capsule, it is likely a T5. Some later Chery QQ models (post-2008) use a smaller, glass-style 46 chip. Use a chip reader if you are unsure. Most automotive locksmith supply stores sell both types for under $15.

Problem 3: “All Keys Lost” – No Working Key Available

This is a high-stress scenario, but the X431 can still help.

• Procedure: Enter the IMMO system, then select Erase Keys or Direct Key Learning (the label depends on your X431 software version). You will need the password from Step 2. Some versions require a “Special Code” from LAUNCH support for this function—check your tool’s activation status before starting.
• Alternative: If the direct method fails, remove the ECU and IMMO box from the car. Take them to a professional locksmith or IMMO specialist who can clone the transponder directly to a new key using a bench programmer. This bypasses the OBDII limitations but costs more.

Expert Tips for First-Time Users

• Don’t skip the voltage check: A battery below 12.4V is the number one cause of incomplete programming that bricks the ECU. Charge the battery or use a jump starter with a stable output.
• Program all keys at once: When you enter the “Add Key” session, the IMMO module is in a learning window. If you exit after programming only one key, you may have to repeat the entire password reading process. Lay out all your keys (old and new) and run them through one after another.
• Software updates matter: If the X431 fails to find the “Chery QQ” menu, make sure the CARS software is updated. In older versions of the LAUNCH software, the QQ might be listed under Chery A1 or Chery QQ3. Try those if the main menu is missing.
• Save money on dealer passwords: A dealer can charge $50–$150 just to read the security code. The X431 does this for free (after the initial tool investment). One or two key programming jobs pay for the scanner itself.
• Have a backup plan: If you are attempting this on a rare or modified Chery QQ (e.g., with an aftermarket ECU), be prepared to take the car to a locksmith. The X431 covers 95% of stock models, but there are always exceptions.

Frequently Asked Questions (FAQ)

Q: Do I need the original key to match a new key?

Yes, usually. The “Add Key” function requires at least one working key to authenticate the learning session. If you have lost all keys, you must use the “Direct Key Learning” or “Erase All Keys” function (which still requires the correct password). Some X431 firmware versions also require a manufacturer unlock code for this scenario.

Q: What type of transponder chip does a Chery QQ use?

Most Chery QQ models (2003–2010) use the T5 (Texas Instruments) transponder. Some later models (2008+) use the Philips 46 type chip. Check your key head or use a chip reader to confirm before buying a blank.

Q: Can I use a cheap OBD scanner instead of the LAUNCH X431?

No. Most generic OBD2 scanners only read engine fault codes and live data. They cannot access the IMMO system. You need a professional tool with IMMO and key programming functions, such as the LAUNCH X431, Autel IM series, or a dedicated key programmer like Tango or XPT.

Q: The scanner says “Password Incorrect” – what does this mean?

This usually means you entered a wrong code. Try these steps:

1. Read the password again; the IMMO box may have glitched during the first attempt.
2. Disconnect the battery for 30 minutes to reset the IMMO module, then re-read.
3. The password might be inverted or displayed in reverse order (e.g., the scanner shows 1234 but the car expects 4321). Try entering the digits backwards.
4. If you are reading from an EEPROM dump, check the byte alignment—some chips store the code in hex (e.g., 0x01 0x23 for code 0123).

Q: Will the LAUNCH X431 work on a 1999 Chery QQ?

No. The anti-theft system on very early Chery QQ models (pre-2002) is often not supported by the LAUNCH X431’s OBDII interface. These older cars use a different communication protocol. You may need a PIN code reader designed for early Bosch or Siemens immobilizers, or a bench programmer.

Q: How much does it cost to get a key programmed at a dealer?

Typically between $80 and $150. Using the LAUNCH X431 yourself can reduce this to the cost of a blank key (about $10–$20). For more details on choosing the right X431 model for your needs, check out our guide on [link to related guide on comparing X431 models].

Disclaimer: Performing anti-theft programming incorrectly can lock the ECU and render the vehicle undriveable. Always confirm compatibility with your specific model year and have a backup plan (such as a locksmith) ready. The author and publisher are not responsible for any damage or loss resulting from the use of this information.

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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