Description
OBDSTAR • C4-09 (MB91F526) adapter kit
The OBDSTAR C4-09 (MB91F526) adapter kit is an accessory intended for professionals using OBDSTAR’s MP001 multifunctional programmer along with a KeyMaster G3 or DC706 main tool. It enables reading and writing of FLASH and DFLASH memory, plus immobilizer (IMMO) data decryption on Magneti Marelli MB91F526 body control modules (BCMs), and FLASH-only access to Denso MB91F526 BDMC used in Mazda 3 vehicles. Comes with adapter board and solder cables for bench-mode module work. Ideal for automotive electronics specialists performing BCM repair, IMMO, or Flash tuning tasks.
Key benefits
- Full FLASH and DFLASH read/write capability on Magneti Marelli MB91F526 BCM modules for Alfa Romeo, Ferrari, Fiat, and Jeep vehicles.
- Immobilizer data decryption support for Magneti Marelli BCMs, useful for key programming and IMMO operations.
- FLASH read/write access for Denso MB91F526 BDMC in Mazda 3 (no immobilizer decryption on these modules).
- Includes W004 and W006 soldering cables to connect securely to module PCB for accurate data exchange.
- Must be used in conjunction with MP001 multifunctional programmer and compatible host tools (KeyMaster G3 or DC706).
Supported protocols
- FLASH memory read/write
- DFLASH memory read/write
- Immobilizer data decryption (Magneti Marelli BCM only)
Supported functions
Depending on vehicle compatibility the following functions are supported:
- Read and write FLASH memory (Magneti Marelli MB91F526 and Denso BDMC on Mazda 3).
- Read and write DFLASH memory (Magneti Marelli MB91F526 only).
- Decrypt immobilizer data (Magneti Marelli MB91F526 BCM modules).
- BCM module bench-mode programming.
Included items
- 1 × C4-09 adapter board
- 1 × W004 solder cable
- 1 × W006 solder cable










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