TAN stands for . It’s a 4‑ to 8‑digit rolling security code generated by Mercedes‑Benz/Smart’s central server (XENTRY/DAS). It’s not stored in the car’s ECU permanently. Instead:

2011 Smart Fortwo , TAN codes (Transaction Authorization Numbers) are unique 12-digit security codes required by the Mercedes-Benz DAS/Xentry diagnostic system to unlock specific software features. What TAN Codes Unlock

Authorizing specialized software updates, such as those from BRABUS , or managing key learning procedures. The Shift in Accessibility

Modified system files ( .dll overrides) inside Xentry/DAS that completely suppress the TAN check.

Enter the calculated code back into the DAS software to finalize the activation. Professional vs. Independent Use

This article provides a comprehensive guide to understanding, finding, and using a . What is a Smart Car TAN Code and Why Do You Need It?

Open the standalone Smart Car TAN Code Calculator utility.

Here’s why — and what actually works.

Initiate the feature activation in your diagnostic program.

In the DAS program, select the feature you wish to activate (e.g., "Key Learning").

When you attempt a locked function in DAS/Xentry, the software generates a "Request Code" or asks for your VIN. Calculation: You enter this request data into a TAN code calculator Authentication:

Ensure the calculator specifically supports the 451 (2007-2015) model year for proper key programming.

A TAN (Transaction Number) is a 12-digit security code required by the vehicle's SAM (Signal Acquisition and Actuation Module) or ECU to activate features that were not originally enabled from the factory. Primary Functions of the Calculator

The most secure way to obtain a TAN code is through an authorized dealer. They will query the official Smart central database to generate the necessary code based on your VIN. While costly, this is the only option that guarantees a valid code without using third-party tools. Steps to Use a TAN Code Calculator on a 2011 Smart

Smart Car Tan Code Calculator 2011 Page