2024-2025 Audi Key Immobilizer Adaptation TSB

Audi has issued Technical Service Bulletin (TSB) 2075132, also known by its full identifier 57 24 60 2075132/1, to address a specific issue affecting the key immobilizer adaptation process in certain 2024-2025 Audi models. This TSB provides guidance for technicians when vehicle keys cannot be adapted to the immobilizer system.

This bulletin applies to 2024-2025 Audi A3, S3, RS 3, and Q3 vehicles, as well as 2025 Audi Q4 e-tron and Q4 Sportback e-tron models.

Symptoms

Owners typically won't experience a direct symptom unless attempting to adapt new keys. The condition is usually discovered during repair work that requires adapting keys to the immobilizer. The primary workshop findings include:

• It is not possible to adapt additional keys for the vehicle.
• During the adaptation procedure, the keys are not recognized by the vehicle.

Technical Background

The root cause of this issue lies in the key adaptation process. When attempting to adapt keys, the key information cannot be reliably read by the interior aerial 1, which is part of the entry and start system. This unreliability is due to resonance frequencies occurring between the transponder within the key and the interior aerial 1.

Diagnosis

To confirm if your vehicle's issue aligns with the cause described in TSB 2075132, a specific diagnostic step is required. Technicians should read out the measured value labeled "Key identification" ID 02F8. This value is found within the onboard supply control unit, which has diagnostic address 0009. The measurement should be performed in cycles, with the vehicle key positioned on the reader coil.

The measured value contains critical information such as the key's part number, hardware number, and software number. If errors occur during this readout, specifically if the value changes to "not OK," it strongly indicates that this TSB applies to the vehicle's condition, confirming the need for the Audi key immobilizer adaptation procedure.

Repair Procedure Summary

The repair procedure outlined in TSB 2075132 focuses on overcoming the resonance frequency issue to allow for proper key adaptation. The steps involve a specific physical intervention before using the workshop tester:

1. Access Interior Aerial 1: The technician must first gain access to the interior aerial 1, which is a component of the entry and start system.
2. Position Special Tool: A 1/2-inch 13mm socket made of chromium-vanadium steel must be positioned onto the interior aerial 1. This tool helps to resolve the resonance frequency interference.
3. Adapt Key: With the socket in place, the key can then be adapted using the workshop tester and its corresponding test program, following the standard adaptation process.

This method ensures that the key information can be read reliably, allowing for successful Audi key immobilizer adaptation.

Required Tools or Parts

To perform the repair procedure, a specific tool is required:

• A 1/2-inch 13mm socket made of chromium-vanadium steel.

Important Warnings

Owners should be aware that this Technical Service Bulletin is informational only. It is explicitly stated that this TSB is not applicable to any Audi Warranty. This means that any diagnostic or repair work performed under the guidance of this TSB may not be covered under standard warranty terms.

Production Solution

Audi is implementing a long-term solution for this issue in new vehicle production. A new software version, 0771, for the entry and start authorization control unit (diagnostic address 00B7), is expected to be integrated into series production. This change will take effect from week 48/2024, aiming to prevent the Audi key immobilizer adaptation issue in future vehicles.

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Source: NHTSA ID: 11009367