Products -> Mercedes Tech Suite

Extreme FBS4 VGS4-0 NAG2 Tool

🔥 Let’s be very clear:

      👉 We were the first in the world to introduce a solution for FBS4 ESL that repairs B225409 & B225464 - fully via diagnostics.

      👉 We were the first in the world to develop a solution for FBS4 DSM working via DSM connector direct - fully via DSM connector - no opening, no physical intervention.

🔥 And now… we do it again.

      Introducing the Diagcode Extreme FBS4 VGS4-0 NAG2 Tool — a breakthrough solution that sets a new standard in working with FBS4 transmission control units.

We understand the challenges that professionals face when working with VGS4-0 NAG2 units, especially when traditional methods require opening the control unit, risking damage, and making it impossible to restore it to its original factory condition.

In response to these limitations and the growing demand for a safer, more efficient approach, we have developed a solution that eliminates these problems entirely.

A Unique Approach

      Most existing solutions rely on invasive or non-standard methods.
These often involve opening the control unit and using modified software approaches that bypass internal protections, leading to compromised reliability and non-OEM behavior.

Such methods introduce unnecessary risk and are not suitable for professional, long-term use.

🔥 The Diagcode Solution

The Diagcode Extreme FBS4 VGS4-0 NAG2 Tool is designed to make work with FBS4 VGS4-0 NAG2 units faster, safer, and significantly more reliable, without any physical intervention.

      ✅ No opening

      ✅ No cutting

      ✅ No soldering

      ✅ No bypassing of internal system protections

All operations are performed entirely via diagnostics via VGS4 connector direct, ensuring a non-destructive workflow that preserves the integrity of the control unit.

The software works with Extreme MB Tool USB Security Dongle and exclusively with  CANtieCAR hardware from Diagcode, optimized to deliver stable, high-speed communication and full functionality for all supported operations. CANtieCAR will also be the only interface supported in all future Extreme FBS4 Tool product releases, ensuring long-term compatibility and consistent performance.

This is not just another tool. This is a new standard in FBS4. Diagcode — TrueGear for True Professionals

Important Notes

* This software works with Extreme MB Tool, Extreme FBS4 ESL Tool, and Extreme FBS4 DSM Tool dongles.
If you already own any of these, no additional dongle is required.

The subscription is shared across all Extreme software products.

** As with all our Extreme products, software updates are FREE.
We do not charge for any software updates.

*** Variant 4 price includes a 365-day subscription from the date of purchase.
After the first year, the standard annual subscription fee applies.

Additional Information

All prices are excluding VAT (if applicable)

The software works only with CANtieCAR™ hardware from Diagcode

An active Extreme Tools software subscription is required for full functionality

Security & Fair Use Limits

For security, software protection and prevention of automated, abnormal or unauthorized use, the Extreme FBS4 VGS4 Tool applies the following limits within a 24-hour period:

• READ: 7 operations
• RENEW: 3 operations
• PERSONALIZE: 3 operations
• RECOVER: 3 operations

These limits are designed for normal professional workshop use and provide more than sufficient capacity for standard DSM diagnostic, replacement, repair and programming procedures.

The security limits are completely separate from the annual software subscription. Reaching a limit does not require any additional payment. The corresponding functionality becomes available again automatically after the security period expires.

These measures are implemented exclusively to protect our proprietary technology, software licensing system and customers against misuse, automated operations and other abnormal usage.

In exceptional cases where additional operations are required during legitimate troubleshooting or a complex repair procedure, please contact DIAGCODE Support.