Mechanic Wiki: How to Add a New Key and Clear Deleted Keys on a Chery Tiggo 3x Using LAUNCH X431

Learn step-by-step how to program a new key and erase lost keys on a Chery Tiggo 3x with a LAUNCH X431 scanner. Includes troubleshooting, tips, and FAQ.

How to Add a New Key and Clear Deleted Keys on a Chery Tiggo 3x Using LAUNCH X431

Published / Last Updated: June 15, 2026

Quick Answer / Key Takeaway

You can add a new key and erase lost keys on a Chery Tiggo 3x using a LAUNCH X431 diagnostic tool by connecting to the immobilizer system, retrieving the security PIN (the X431 does this automatically for most models), and then selecting either “Add New Key” or “Erase Lost Keys.” Always keep at least one working key before deleting any, and ensure battery voltage remains stable throughout. The entire process takes about 10–15 minutes and requires no specialized mechanical skills — just follow the on-screen prompts carefully.

Understanding the Chery Tiggo 3x Immobilizer System

Before jumping into the procedure, it helps to understand why your Tiggo 3x even needs key programming. The immobilizer is an electronic security system that prevents the engine from starting unless it detects a properly coded transponder chip inside the ignition key. When you lose a key, that key still holds a valid code in the ECU’s memory — which means a thief could use it to drive away. Clearing deleted keys removes those codes, and adding new keys pairs fresh transponders to the ECU.

The Tiggo 3x typically uses a combination of a remote fob (locking/unlocking doors) and a separate transponder chip inside the key head. Most models operate on 433 MHz or 315 MHz frequencies for the remote functions, though the exact frequency depends on the market region. The LAUNCH X431 — whether you own the Pro, Pad, or Elite version — can handle the immobilizer programming as long as you have the latest Chery software installed and an active Immobilizer module. Some older X431 units may require a paid subscription for online code retrieval, so check your tool’s capabilities before starting.

Prerequisites and Preparation

Taking a few minutes to prepare will save you from a frustrating half-finished procedure. Here’s what you need:

Required Equipment

LAUNCH X431 diagnostic tool – fully charged or plugged into a power source. A sudden loss of tool battery mid-programming can corrupt the immobilizer data.
A new, compatible key – it must contain the correct transponder chip type (usually a 4C or 4D chip for Chery) and the right remote frequency. Buying a cheap blank key without a proper chip is a guaranteed failure.
Any original keys you want to keep working – have them physically present in the vehicle during programming if the procedure requires it.

Vehicle Preparation

Battery voltage – measure the car battery; it should read above 12.5V. If it’s lower, connect a battery maintainer or charger. Low voltage is the number one reason programming fails midway.
Ignition – start with the ignition switched OFF. You’ll turn it ON at specific steps.
OBDII port – located under the dashboard on the driver’s side, usually near the hood release lever. Make sure it’s clean and accessible.

Safety Notes

Do not interrupt the sequence – once you start adding or deleting keys, avoid turning the ignition off unexpectedly or unplugging the X431. This can brick the immobilizer module, requiring a dealer visit.
Keep other keys and electronics away – place any other key fobs, smartphones, or RFID cards at least two feet from the ignition area. They can interfere with transponder detection.
One key rule – if you have only one working key, program a second one before erasing any lost keys. This gives you a fallback.

Step-by-Step Procedure: Adding a New Key

Follow these steps in order. The LAUNCH X431 interface is intuitive, but the exact menu labels can vary slightly between software versions.

Step 1: Connect the LAUNCH X431 to the Vehicle Plug the diagnostic tool into the OBDII port. Turn the ignition to the ON position (engine off). The X431 will power up automatically. From the main menu, select Chery → Tiggo 3x → then choose your vehicle’s model year and engine type. The tool will perform a quick system identification.

Step 2: Navigate to the Immobilizer / Key Programming Menu In the main diagnostic menu, look for “Immobilizer” — sometimes labeled “IMMO” or “Security.” Tap it, then select “Key Programming” or “Program New Key.” The tool will read the current immobilizer status and display how many keys are already stored. Write this number down for reference.

Step 3: Obtain the Security Access (PIN) Code The LAUNCH X431 typically retrieves the 4- or 5-digit security PIN automatically by communicating with an online database (requires an internet connection). If your subscription supports it, the tool will show the PIN on screen. In some cases, you may need to enter a code manually — this code can often be obtained from a Chery dealership after providing proof of ownership. Follow the tool’s prompt to confirm or input the PIN.

Step 4: Select “Add New Key” From the key programming options, choose “Add New Key.” Do not select “Program All Keys” unless you intend to erase all existing keys and start fresh. The X431 will now instruct you to insert the new key into the ignition slot (or hold it near the start button if your Tiggo 3x has push-to-start). Turn the key to the ON position. The tool will attempt to read the transponder chip. If it fails, try rotating the key slightly in the ignition — the antenna ring around the lock cylinder can be finicky.

Crucial note: Some procedures from LAUNCH require that all existing keys be present inside the vehicle (e.g., placed in the glovebox or cup holder) to prevent accidental erasure. Read the on-screen instructions carefully. When in doubt, have all keys in the cabin.

Step 5: Complete Programming Once the tool detects the new key, press “OK” or “Program.” The X431 will write the key data to the ECU. A success message will appear — do not turn the ignition off yet. Remove the new key and test it immediately:

Lock and unlock the doors using the remote buttons (if it’s a remote key).
Insert the key into the ignition and start the engine.

Step 6: Verify All Keys Work Test each original key that you kept. If any key fails to start the engine, you may need to re-program it using the same “Add New Key” procedure. If the original keys were accidentally erased (because you didn’t have them present), you’ll need to move to the next section and use “Program All Keys.”

Step-by-Step Procedure: Clearing Deleted Keys

Clearing lost keys is a security measure that prevents anyone from starting your car with a stolen or misplaced key.

Step 1: Enter the Immobilizer Menu Follow the same initial steps as for adding a key: connect the LAUNCH X431, go to Immobilizer → Key Programming.

Step 2: Select “Erase Lost Keys” or “Delete Keys” The tool may display a list of all programmed keys (by slot number 1, 2, 3, etc.). Choose the specific keys you want to delete, or select “Delete All Lost Keys.” Confirm your selection. The X431 will communicate with the ECU and remove those key codes from memory.

Step 3: Re-Program Remaining Keys (Critical) Here’s where many DIYers get stuck. On many Chery Tiggo 3x models, deleting a key triggers a rolling code reset that invalidates all remaining keys. To avoid being locked out, do this:

Have all remaining keys physically with you.
Immediately after deletion, select “Program All Keys” (or “Program Remaining Keys”).
Follow the tool’s prompts to program each key one at a time. It will usually ask you to program the master key first, then the others in any order.

If you cannot program all keys immediately (e.g., one key is at home), do not proceed with the deletion at all. Instead, wait until you have all keys together.

Step 4: Final Verification After re-programming, test every key. Start the engine, lock/unlock doors, and check the remote range. If a key fails, repeat the “Program All Keys” procedure — occasionally the sequence requires two passes.

Troubleshooting Common Issues

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

LAUNCH X431 not connecting to the vehicle

Ensure ignition is ON — some tools need accessory power to communicate.
Check the OBDII connector pins; if they are bent or dirty, clean them gently with contact cleaner.
Update your X431 software to the latest Chery package. Older software may lack support for late-model Tiggo 3x.

New key not recognized during programming

Verify the key actually contains a transponder chip. Some aftermarket blanks are just metal and plastic — they look identical but lack the electronic component.
If the remote buttons don’t work, replace the key’s internal battery (usually a CR2032 coin cell). The transponder still works without battery power, but the remote won’t.
Hold the key exactly as instructed. For push-to-start models, the transponder antenna is inside the start button – you may need to touch the key directly to the button surface.

Security access code not accepted

Double-check that you selected the correct vehicle year and engine type. A mismatch can produce an incorrect PIN.
Use the X431’s online PIN retrieval feature (requires subscription). If that fails, contact a Chery dealer — they can provide the PIN after verifying ownership.
Some Chinese-market Tiggo 3x use a 5-digit PIN; others use 4 digits. The tool should handle both, but manual entry errors are common.

All keys erased accidentally

Do not panic. The “Program All Keys” function can re-register all keys sequentially. You will need the security PIN again; the X431 may automatically re-retrieve it.
If you have zero working keys left (for example, if you deleted the only key), you may need to replace the immobilizer module or have a dealer physically rewrite it. Keep a spare key before attempting any deletion.

Programming fails halfway through

Low battery voltage is the usual culprit. Connect a battery maintainer or charger to the car battery, then restart the X431 and try again.
Cycle the ignition fully OFF for 30 seconds, then back ON. This resets the immobilizer’s internal state.
Check for interference from aftermarket LED lights or other electronics near the steering column. Move them away if possible.

Important Tips and Considerations

Keep a backup key – Before you delete lost keys, always ensure at least one working key remains programmed. If you have only one key, buy a second blank and program it first.
Model variations matter – Newer Tiggo 3x models (2020 and later) sometimes use combined immobilizer/BCM (Body Control Module) units. The menu pathway on the LAUNCH X431 may be slightly different — look for “Immobilizer + BCM” or “Security System.” Always update your X431 software for full coverage.
Key frequency confirmation – The remote fob’s frequency must match your vehicle. You can usually find this information stamped on the original key or in the owner’s manual. Using a 315 MHz remote on a 433 MHz car will only give you a useless key.
Internet connection – The LAUNCH X431 uses an online database to retrieve PIN codes and vehicle updates. Keep it connected to Wi-Fi or a mobile hotspot throughout the procedure. The actual key programming happens locally, but the PIN retrieval step requires internet access.
OBD port power stability – If your X431 battery is weak, use an external power adapter plugged into a cigarette lighter or a USB power bank. A power loss during writing can corrupt the immobilizer ECU.
Consider professional help for irreversible steps – If you are unsure about the “Erase Lost Keys” function or you only have one key, consider visiting a locksmith or dealership. The cost of a tow and a new immobilizer module far exceeds the price of professional programming.

Frequently Asked Questions (FAQ)

Q: Can I add a key without having any original keys? A: Possibly, but you will need the security PIN and use the "Program All Keys" function (which erases all previous keys). If you have zero keys, you may need a dealer to physically recode the immobilizer unit.

Q: How many keys can the Chery Tiggo 3x store? A: Typically 4 to 8 keys, depending on the year and ECU firmware. Check the tool’s display after reading immobilizer status.

Q: Do I need an internet connection for the LAUNCH X431 to program keys? A: For PIN retrieval, yes (online database). For the actual programming, no – it is done locally. However, an internet connection is recommended for software updates.

Q: Will clearing deleted keys affect my existing keys? A: If you choose "Erase Lost Keys" without re-programming the remaining ones, those keys will still work only if the system does not require a reset. On many Tiggo 3x, deletion triggers a full reprogram cycle, so you must program all remaining keys immediately after.

Q: What if I don’t have the security code? A: The LAUNCH X431 can retrieve it for most models via its online service (may require a paid subscription). Alternatively, contact a Chery dealership with proof of ownership.

Q: The LAUNCH X431 says “Key programming not supported on this vehicle.” What should I do? A: Make sure you have the latest Chery software installed. Some early 2016 Tiggo 3x models may require a different tool or a firmware update. Contact LAUNCH support.

Q: Can I program an aftermarket key clone? A: Only if it has a genuine transponder chip (e.g., a MQB or 4C chip). Cheap blank keys often lack proper chips and will not be recognized. Use OEM or high‑quality aftermarket keys.

Conclusion

Adding a new key and clearing lost keys on a Chery Tiggo 3x with a LAUNCH X431 is a straightforward DIY process when you follow the correct steps. Always prep the vehicle, obtain the security code, and have all keys present to avoid accidental lockouts. If you encounter resistance, check the tool’s software and key compatibility. For irreversible procedures like full erasure, consider consulting a professional. The LAUNCH X431, with its guided menu and PIN retrieval, empowers you to manage your vehicle’s security confidently.

For a deeper dive into other immobilizer programming tasks, check out our guide on [link to related guide on similar topic] to learn how to handle lost-all-keys situations on other Chinese brand vehicles.

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/