2021-2023 Audi e-tron Key Adaptation FAZ1552E TSB

Owners of 2021-2023 Audi e-tron vehicles may encounter difficulties when attempting to adapt a new or replacement key. This can manifest as specific error messages appearing during the key adaptation process, preventing the successful programming of the key to the vehicle's immobilizer system.

Symptoms

Owners typically notice this problem when they are trying to replace an existing key or add an additional key to their Audi e-tron. The key adaptation process, usually performed by a technician using diagnostic tools, will fail. During this failure, specific error messages are displayed on the diagnostic tool screen or within the vehicle's system.

Fault Codes and Messages

When the Audi e-tron key adaptation FAZ1552E issue occurs, technicians will observe the following verbatim error messages during the vehicle immobilizer adaptation test plan in Guided Fault Finding:

• "FAZ1552E Key status not valid"
• "FAZ1540E Action not successful"

These messages indicate that the vehicle's system cannot properly validate the key or complete the necessary programming steps.

Technical Background

The underlying cause of the Audi e-tron key adaptation FAZ1552E problem is a temporary loss of reliable communication. During the critical key adaptation procedure, the vehicle's system is unable to maintain a consistent connection between the new key and the vehicle's reader coil. This interruption prevents the immobilizer system from successfully registering the key, leading to the reported error messages.

Repair Procedure Summary

To resolve the Audi e-tron key adaptation FAZ1552E issue, technicians must follow a specific procedure that temporarily interrupts power to a key control module. This involves:

1. Fuse Removal: Before initiating the key adaptation process, the technician must locate and remove two specific fuses: fuse number SD5 and fuse number SD7. These fuses supply KL15 (ignition switched) and KL30 (constant) power, respectively, to the Electric Drive Control Module J1234. This control module is identified by Diagnostic Address: 0051. The TSB includes figures (Figure 1 for SD5, Figure 2 for SD7) illustrating the precise locations of these fuses within the vehicle's fuse box.
2. Key Adaptation: With fuses SD5 and SD7 removed, the technician can then proceed with the vehicle immobilizer adaptation test plan in Guided Fault Finding as usual. The temporary power interruption to the Electric Drive Control Module J1234 allows the key adaptation to complete successfully without communication issues.
3. Fuse Reinstallation: Once the key adaptation process has been successfully completed, the technician must reinstall both fuse SD5 and fuse SD7 back into their original positions.

This procedure effectively resets the communication pathway, allowing the key programming to proceed without interruption.

Important Notes for Owners

Owners should be aware that this Technical Service Bulletin is for informational purposes only. It outlines a procedure for technicians to address a specific issue during key adaptation. The TSB explicitly states that it is not applicable to any Audi warranty. This means that any costs associated with diagnosing or performing this procedure may not be covered under standard warranty terms, and owners should discuss this with their service center.

TSB Revision History

This Technical Service Bulletin has undergone several revisions:

• Revision 1: Initial publication on August 31, 2022.
• Revision 2: Published on November 23, 2022, primarily revising the header to add more model years.
• Revision 3: Published on March 31, 2023, further revising the header to include additional model years.

NHTSA ID: 10233546