Siemens MSS52/MSS54/MSS54HP

New AT Protocol!

Dear Users,

Make the legends roar! We are extremely proud to announce that the famous Siemens MSS52, MSS54, and MSS54HP ECUs are now officially supported on your AutoTuner Tool.

This protocol opens the doors to the BMW Motorsport hall of fame. It allows you to work on the mythical naturally aspirated inline-6 and V8 engines that forged the brand's reputation in the late 90s and early 2000s. Today, these vehicles are highly sought-after collector cars whose owners often seek refined optimizations, such as rev limiter adjustments and drivability improvements.

⚡ Method: 100% OBD (Normal Read - NR) Respect the integrity of these collector cars! You now have a solution that allows you to read and write these ECUs directly through the diagnostic port, with no tedious bench work or removal required.

Supported Highlights:

• BMW M5 (1995+) - 4.0i
• BMW M3 (1998+) - 3.2i (M)
• BMW Z8 (1999+) - 4.0i
• BMW Z4 (2002+) - 3.2i (M)

Update your tool today and revive the greatest Bavarian mechanical symphonies!

The AT Team

Key Features

• Type: Engine Control Unit (ECU) ⚙️
• Mode: OBD NR 🔌
• Readout: Calibration 🧩
• MCU: MC68336 🖥️
• Read time: 2 min 30 sec ⏱️
• Write time: 2 min 15 sec ⏱️
• Checksums correction ✅

Compatibility List*

🚗 BMW Models: M5 (1995) / Z4 (2002) / Z8 (1999)
🔧 BMW Engines: 3.2i (M) / 4.0i

*The list may evolve over time.