Mechanic Wiki: How to Program a New Key for Changan Oushang A800 with LAUNCH X431

Learn step-by-step how to program a new key for Changan Oushang A800 using LAUNCH X431. Includes troubleshooting, security code retrieval, and remote sync tips.

Published: June 1, 2026

Quick Answer: Programming a New Key for Changan Oushang A800 with LAUNCH X431

You can program a new key for the Changan Oushang A800 using a LAUNCH X431 diagnostic tool by accessing the Immobilizer (IMMO) function, selecting “Key Programming,” and following on-screen prompts. The process typically takes 10–15 minutes, requires the original master key, and may involve entering a security code. If you don’t have a security code, the LAUNCH X431 can often retrieve it from the vehicle’s ECU.

Understanding the Programming Process

Why Key Programming Is Necessary

The Changan Oushang A800 uses a transponder chip embedded inside the key fob. This chip communicates with the vehicle’s immobilizer system — a security feature that prevents the engine from starting unless a correctly coded key is present. Simply cutting a new key blade or buying an aftermarket remote won’t work on its own. Without programming, the immobilizer will cut the fuel and ignition, leaving you stranded.

Tools and Equipment Required

Before starting, gather everything you’ll need:

LAUNCH X431 scanner – Any model with IMMO and key programming support (e.g., X431 Pro, X431 V+, X431 PAD VII)
New blank key – OEM or compatible transponder key; the A800 typically uses a 4D‑60 or 48 chip type
Original master key – You need at least one working key to add new ones (ideally both existing keys)
Stable 12V battery – Connect a battery charger if the vehicle battery is weak. Programming can fail if voltage drops
Internet connection – Required for downloading vehicle-specific software and for automatic security code retrieval

Supported Key Types

Standard remote key with integrated transponder – Turn to start, usually a flip or fixed blade design
Smart key (passive entry) – If your A800 has push‑button start, the programming procedure is similar but may require placing the key in a designated spot (e.g., a cup holder recess) during learning

Step-by-Step Key Programming for Changan Oushang A800

Follow these steps carefully. I recommend having both existing keys on hand in case you need to re‑program everything.

1. Prepare the Vehicle and Scanner

Turn the ignition OFF and close all doors.
Connect the LAUNCH X431 to the vehicle’s OBD-II port – it’s under the dashboard on the driver’s side.
Power on the scanner and select Changan → Oushang A800 from the vehicle selection menu.
If prompted, update the software to the latest version. This ensures compatibility with newer model years.

2. Enter the Immobilizer (IMMO) System

From the main menu, tap Immobilizer or IMMO.
Navigate to Key Programming or Key Learning.
The scanner will attempt to communicate with the ECU. If it asks for a security code (PIN), move to the next step.

3. Retrieve or Enter the Security Code

The security code is the biggest hurdle. Here’s how to deal with it:

Option A (Automatic retrieval): The LAUNCH X431 can often read the security code directly from the ECU. This requires an active subscription and internet. The scanner will display the code on screen.
Option B (Manual entry): If you already have the code – written on a card in the owner’s manual, or obtained from a previous service – enter it directly.
Option C (VIN lookup): Some LAUNCH models offer a built‑in VIN‑based code generator. Alternatively, contact a dealer or locksmith with your VIN and proof of ownership.
Troubleshooting Tip: If code retrieval fails, double‑check that your IMMO package is activated for Chinese vehicles in the scanner’s subscription settings.

4. Add the New Key

Once authorized, the scanner shows the current number of learned keys (the A800 typically supports up to 4 keys).
Select Add Key (do not choose “Erase All Keys” unless you have lost all keys and are starting from scratch).
Insert the new blank key into the ignition slot (or bring it near the push‑button start area for smart keys).
Follow the on‑screen instructions. Usually, you’ll need to turn the ignition ON with the new key for a few seconds until the scanner confirms “Key Learned” or “Programming Successful.”

5. Test the New Key

Remove the new key. Wait about 10 seconds, then insert it and attempt to start the engine.
If the engine starts, also test the remote lock/unlock buttons. If the remote doesn’t work, see the troubleshooting section below.

6. (Optional) Program a Second New Key

If you’re adding a second new key, repeat steps 4–5 immediately. Many immobilizer systems require all keys to be programmed in one session, otherwise previously added keys may be erased.

Detailed Troubleshooting for Common Issues

Even with the right tool, things can go wrong. Here’s how to handle the most frequent problems.

Issue: Scanner Cannot Connect to IMMO

Check the OBD-II connection: Try a different cable or ensure the pins are clean.
Update the software: Go to Software Update and download the latest Changan package.
Battery voltage: Connect a battery maintainer if the voltage is below 12V. Low voltage interrupts communication.
Special activation: Some A800 models (especially early 2016–2017) require a special IMMO unlock code from LAUNCH support. Contact them with your scanner serial number.

Issue: Security Code Not Found by Scanner

Manual entry: Enter the code if you have it from dealer records.
VIN method: Use the scanner’s “Security Code by VIN” feature (available on some X431 models).
Alternative: If you still have two original keys, you can sometimes extract the code by reading the BCM (body control module) using a different path. This is more advanced and may require a second tool.

Issue: New Key Starts Engine but Remote Doesn’t Work

This means the transponder chip was programmed successfully, but the remote control frequency wasn’t learned.

Manual remote sync: Sit inside the car with all doors closed. Turn the ignition ON and OFF repeatedly (try 5 times within 10 seconds). Then press any button on the new remote. The hazard lights should flash once to confirm.
Use the X431: Go back to IMMO → Remote Control Learning and follow the on‑screen procedure.

Issue: Engine Starts Then Stalls After Programming

The key may not have been fully learned. Repeat the entire programming process without skipping steps.
If the problem persists, erase all keys (using “Erase All Keys” in the scanner) and program all keys again in one session.
Confirm the chip type: The A800 uses a 4D‑60 or 48 chip. Cheap aftermarket keys sometimes contain a wrong or incompatible chip.

Issue: LAUNCH X431 Freezes or Errors During Programming

Restart the scanner and try again after closing other background apps.
Ensure you’re not running any other diagnostics simultaneously.
Update the X431’s firmware via the System Update menu.

Topical Depth: Important Context

Understanding Transponder vs. Remote

The transponder chip is solely for immobilization – it’s what allows the engine to start. The remote function (lock/unlock) is separate and runs on a different frequency (typically 433 MHz). Programming the chip does not automatically program the remote. You must perform both steps if your new key is an integrated flip key.

When to Erase All Keys and Start Over

If you’ve lost all your keys, the only way forward is to erase all keys using the LAUNCH X431. This wipes the immobilizer memory, after which you can program new keys from scratch. This requires the security code. Without it, you’ll likely need a dealer or locksmith.

Differences Between Key Types on Oushang A800

Standard key (turn to start): Uses a 4D‑60 transponder. The remote is usually integrated. Programming is straightforward.
Smart key (push‑button start): Uses a wireless transponder that communicates with the start button and a detection antenna (often near the cup holder). During programming, you may need to place the key in a specific recess.

LAUNCH X431 Subscription Requirements

IMMO and key programming functions often require an active subscription or credits. Check your plan before starting. If you don’t have IMMO access, you may need to purchase a one‑time or annual package. For more details, see our guide on LAUNCH X431 subscription plans (placeholder for internal link).

Frequently Asked Questions (FAQ)

Q1: Can I program a new key without the original master key?
A: Usually no. The LAUNCH X431 can add a key only if at least one valid key is present. If you have lost all keys, you need to erase all keys first, which requires the security code. Without that code, you’ll need a locksmith or dealer.

Q2: How many keys can the Changan Oushang A800 support?
A: It typically supports up to 4 keys (some model years allow 5). The scanner will show the maximum during the programming session.

Q3: Can I use an aftermarket key from Amazon or AliExpress?
A: Yes, as long as it’s the correct transponder type (4D‑60 or 48). However, quality varies. I’ve seen aftermarket keys fail within months. Always test the remote function separately. For more on choosing the right key, check our transponder key compatibility article (placeholder for internal link).

Q4: Do I need internet on the LAUNCH X431 during programming?
A: For automatic security code retrieval and for downloading vehicle software, yes. For the actual programming step, offline is fine once the software is loaded. Connect to Wi‑Fi before starting.

Q5: How long does the programming take?
A: 10–20 minutes, including setup and testing. The actual key learning step is under 2 minutes per key.

Q6: What if the LAUNCH X431 says “Failed to Learn Key”?
A: First, confirm the new key isn’t already programmed to another vehicle. Try a different blank key. Ensure the ignition is fully ON (key in the correct position). For smart keys, verify the key is in the detection zone (often the cup holder or near the start button).

Q7: Will programming the new key erase my existing keys?
A: Only if you select “Erase All Keys” or if you exceed the maximum key slots. Using “Add Key” preserves existing keys.

Q8: Can I do this myself, or do I need a locksmith?
A: With a LAUNCH X431 and basic mechanical skills, you can do it yourself. The biggest challenge is the security code. If your scanner cannot retrieve it and you don’t have it, a locksmith or dealer may be required.

Q9: My new key works for unlocking but not for starting – what’s wrong?
A: The transponder chip wasn’t programmed. You only synced the remote. Go back to IMMO → Key Learning and learn the transponder properly.

Q10: How do I get the security code for my A800?
A: The LAUNCH X431 can often read it from the ECU. Alternatively, the code may be printed on a card in the owner’s manual or on a sticker inside the glove box. As a last resort, a Changan dealer can provide it with proof of ownership.

For the latest updates on LAUNCH X431 software, check the official LAUNCH website. Always refer to the specific instructions for your A800 model year (2016–2021).

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.

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