LAUNCH XPROG3 and X431 Key Programmer are often mentioned together as LAUNCH IMMO tools. So what are the differences between these two? Do they overlap in functionality? What scenarios do they each cater to? This article will introduce the differences between these two tools.
First, let’s introduce the functions of LAUNCH XPROG3 and X431 Key Programmer.
LAUNCH X431 Key Programmer Function:
Read Transponder
Generate Transponder
Detect Frequency
Detect Ignition switch coil signal
Generate Remote (Launch X431 remote)
Set type of super chip
Set type of wireless remote
Unlock Toyota smart key
Compatible with Launch super chip and vvdi super chip
Supports VAG ID48 96bit Cloning (Check how to purchase tokens).
LAUNCH PROG3 Functions:
1. Read BMW engine ISN code.
2. Read/write BMW CAS4+ and FEM chips.
3. Read/write Audi fifth-generation steering column chips
4. Read/write EEPROM.
5. Read/write MCU.
6. VW Fourth-generation Dump Mode All Keys Lost.
7. Read engine in BENCH mode.
8. Read gearbox data.
9. Supports VW/AUDI MQB platform engine ECU replacement or cloning (Read engine ECU data directly from the key).
10. Supports VW/AUDI MQB platform gearbox ECU replacement or cloning.
11. Supports ECU replacement for the fifth-generation of Audi (0AW/0B5) gearbox.
12. Supports reading, writing & cloning the ECU for the fourth-generation of VW UDS engine.
13. Supports BMW E chassis 8HP gearbox ECU reprogramming to empty.
14. Works with reprogramming device to backup/restore programming data (For Bosch/Siemens engine ECU)
etc.

As you can see, the X431 Key Programmer and LAUNCH XPROG3 are tools for different purposes:
The X431 Key Programmer is only used for key generation and detection and does not support other functions;
The XPROG3 cannot be used for key generation, but it supports functions such as key programming and ECU programming.
Both X431 Key Programmer and LAUNCH XPROG3 can be used to activate X431 tools with IMMO software licenses, such as X431 CRP919E BT, X431 CRP919X BT, PAD V ELITE, PAD VII ELITE , X431 Pros Star, Launch X431 Pro5, PRO TT, PR03 ACE, Pros Elite, Pro Elite, Pro3 V5.0 (V+ V5.0), PROS5.0, Pro3S+ V5.0, PRO DYNO,PRO3 APEX, etc.
NOTE: The standard package of the LAUNCH X431 IMMO tool (X431 IMMO ELITE/IMMO PLUS) includes the XPROG3 tool, but the X431 Key Programmer needs to be purchased separately.
NOTE 2: The new LAUNCH X431 G5 (not yet available for sale) not only supports the functions of the XPROG3, but can also completely replace the X431 Key Programmer for key generation.







