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Xentry 3.91 Error Fix: A Comprehensive Guide for Automotive Diagnostics

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Encountering errors while using your diagnostic tools can be a major roadblock, especially when you’re dealing with complex systems like those in Mercedes-Benz vehicles. One common issue faced by technicians and enthusiasts alike is the Xentry 3.91 error. This error can halt your diagnostic process and leave you searching for a solution. This guide aims to provide a detailed, SEO-optimized approach to fix the Xentry 3.91 error, alongside other essential fixes for a smoother Xentry Passthru installation and operation.

This guide is tailored for professionals and DIY enthusiasts working with Mercedes-Benz vehicles and the Xentry diagnostic software. We’ll walk you through each step required to not only resolve the 3.91 error but also to ensure a robust and error-free Xentry Passthru setup.

Preparing Your System for Xentry Passthru Installation

Before diving into error fixes, a solid foundation is crucial. Proper system preparation is the first step to avoid common installation pitfalls and ensure compatibility.

  1. Operating System Setup: Begin by preparing a Windows system, ideally Windows 7 SP1 (either x86 or x64 architecture, with x64 being the recommended path for modern systems). It’s essential to run the setup as an administrator.

    • Disable User Account Control (UAC): Temporarily turn off UAC to prevent permission issues during installation.
    • Disconnect from the Internet: An offline installation environment is recommended to avoid conflicts with automatic updates during the setup process.

    Note on Windows Updates: Be aware that certain Windows updates released post-2018 can cause driver conflicts, particularly on Windows 7. These conflicts may manifest as:

    • An exclamation mark on the display adapter (like HD3000) in Device Manager.
    • The monitor disappearing from Device Manager.
    • Network Interface Card (NIC) malfunctions.

    Specific problematic updates include:

    • HP 8460p: KB4093118
    • Dell systems: KB4103718, and quarterly 06/2018 rollups.

    Identifying and, if necessary, removing these updates can preemptively solve potential driver-related issues.

  2. Initiate Xentry Setup: Run the setup.exe file from your Xentry XDOS ISO or Xentry Passthru ISO to begin the installation process.

Essential Post-Installation Fixes for Xentry

Once the basic installation is complete, several fixes are crucial to address common errors and enhance the functionality of your Xentry system.

Resolving Missing Picture Issues

  1. Copy Missing Pictures: After installation, you might find that some pictures are missing within the Xentry application. To fix this, copy the “xentry missing pictures” folder to the correct directory based on your Windows architecture:

    • x86 (32-bit Windows): C:Program FilesMercedes-Benz
    • x64 (64-bit Windows): C:Program Files (x86)Mercedes-Benz

    This step ensures that all visual elements within Xentry are displayed correctly, improving the user experience and diagnostic clarity.

Configuring License Keys for ConfigAssist and StartKeyCenter

  1. Install Old Keys Loader: To enable ConfigAssist or StartKeyCenter to accept license keys generated by older Xentry/DAS keygens (often referred to as ‘old keys’), you need to apply a registry fix. Choose the appropriate loader based on your Windows OS:

    • For Windows x86 (32bit): Run old key loader for configassist or startkeycenter 32bit.reg
    • For Windows x64 (64bit): Run old key loader for configassist or startkeycenter 64bit.reg

    Double-click the corresponding .reg file and confirm the action to merge it into the registry. This allows your Xentry installation to recognize and validate older license keys.

    The registry keys are applied to these locations:

    • x86 (32-bit Windows): C:WindowsSystem32
    • x64 (64-bit Windows): C:WindowsSysWOW64

  2. Enter Xentry License Key: Run ConfigAssist or StartKeyCenter and input your Xentry license key. With the old keys loader installed, the system should now accept your license, granting you access to Xentry functionalities.

Preventing “No Access Authorization Code” Error (X4711 Method)

  1. Implement X4711 Method: This method, introduced in 2012, is designed to prevent the “no access authorization code” error, especially during online diagnostics and SCN coding. It safeguards your Xentry license key from being inadvertently deleted during online sessions.

    a. Backup License File: Locate lic_key_2.dat in C:ProgramDataLicDir. Copy this file to your desktop and rename the copy to lic_key_2.x4711.

    b. Set File Attributes: Make the original lic_key_2.dat file in C:ProgramDataLicDir not read-only. Then, set the newly renamed lic_key_2.x4711 file on your desktop to read-only.

    c. Move Back: Move the read-only lic_key_2.x4711 file back into the C:ProgramDataLicDir directory.

    This procedure ensures that a read-only copy of your license key is present, preventing online processes from deleting or corrupting your active license.

Fixing Xentry Error 2221-45

  1. Install 2221-45 Error Fix: Error code 2221-45 is another common issue. To resolve it, you need to copy a specific fix to the Xentry plugins directory:

    • x86 (32-bit Windows): C:Program FilesMercedes-BenzXENTRYfusokoeclipseplugins
    • x64 (64-bit Windows): C:Program Files (x86)Mercedes-BenzXENTRYfusokoeclipseplugins

    This fix typically involves replacing or adding a plugin file that addresses the root cause of the 2221-45 error.

Addressing Xentry Error 3.91

  1. Apply 3.91 Error Fix: This is the core focus for many users. The Xentry 3.91 error can be resolved by modifying a specific file within the Xentry installation directory.

    • Navigate to the Correct Path: Access the following directory based on your system architecture:

      • x86 (32-bit Windows): C:Program FilesMercedes-BenzXENTRYKontexteAllgemeine_AblaeufePublic_Functions
      • x64 (64-bit Windows): C:Program Files (x86)Mercedes-BenzXENTRYKontexteAllgemeine_AblaeufePublic_Functions

    • Delete or Rename db2mv.gmf: Locate the file named db2mv.gmf within this directory. You should either delete this file or rename it (e.g., to db2mv.gmf_backup).

    By removing or renaming db2mv.gmf, you effectively bypass the component causing the 3.91 error, allowing Xentry to proceed without interruption.

Resolving DAS License 0-Day Error

  1. Install DAS License 0 Day Fix: If you encounter a “DAS license 0 day” error (note: this fix is generally not applicable for MB Bus systems), you can apply a fix to the DAS binary directory:

    • x86 (32-bit Windows): C:Program FilesMercedes-BenzDASbin
    • x64 (64-bit Windows): C:Program Files (x86)Mercedes-BenzDASbin

    This fix usually involves replacing or patching a file within the bin directory to resolve the license validation issue for DAS. This can be used in conjunction with a DAS Standalone full-size installation.

Installing Passthru Device Drivers

  1. Install Passthru Device Driver: The final step in setting up your Xentry Passthru system is to install the appropriate device driver for your specific passthru interface. The driver installation process will vary depending on the make and model of your passthru device. Always refer to the device manufacturer’s instructions for the correct driver installation procedure.

Bonus Tips for Enhanced DAS Functionality

Beyond error fixes, here are some tips to enhance your experience with DAS Standalone.

Tip No 2: Batch File for Running DAS Standalone

Create a batch file to easily launch DAS Standalone with a floating ignition on/off menu.

  • Name: DAS32R2.bat
  • Purpose: To provide a floating ignition menu in DAS.
  • Notes:
    • Ensure your DAS standalone executable is located in dasbin and is named DAS32R2sd.exe.
    • Replace the existing DAS32R2.bat in dasbin with your new file.
    • Create a desktop shortcut to DAS32R2.bat and rename it to “D A S”.
    • Optionally, change the shortcut icon to a DAS icon for visual identification.

Tip No 3: DAS Simulation Mode

Enable DAS simulation mode with a batch file.

  • Name: simdasa.bat
  • Purpose: To activate DAS simulation mode.
  • Notes:
    • Similar to Tip No 2, ensure DAS standalone DAS32R2sd.exe is in dasbin.
    • Extract and copy simdasa.bat into the dasbin directory.
    • Create a desktop shortcut to simdasa.bat, name it “DAS SIM”, and consider using a distinct icon.

Tip No 4: DAS Ignition On/Off Enabler

Address situations where DAS may not recognize ignition changes or the floating menu is greyed out.

A. The Traditional Method (Manual File Edit)

  • Edit the global.sim file located at C:ProgramDataMercedes-Benzcsdwritefilsim.
  • Under the [GLOBAL] section, change IGNITION=ON to IGNITION=OFF or vice versa as needed.
  • You can create two batch files (ignition on.bat and ignition off.bat) to quickly toggle this setting.

B. The Modern Approach (Batch File Solution)

  • Create a batch file to automate the ignition on/off setting. Running this file will reliably activate or enable the floating ignition on/off menu without manual file editing.

By implementing these fixes and tips, you can significantly improve the reliability and functionality of your Xentry Passthru system, ensuring smoother and more efficient Mercedes-Benz diagnostics. Addressing errors like the Xentry 3.91 error head-on will save you valuable time and frustration, allowing you to focus on what matters most – vehicle diagnostics and repair.

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