2021-2026 Audi Climate Control Not Working TSB 2079243/1

Audi has issued Technical Service Bulletin (TSB) 2079243/1, titled "87 Workshop info: pressure and temperature sensor with different indexes not compatible," to address various climate control system malfunctions in a range of its 2021-2026 models. This bulletin, released on September 9, 2025, highlights that a hardware issue with the pressure and temperature sensor can lead to the climate control not working correctly.

Symptoms

Owners of affected Audi vehicles may experience several issues with their climate control system, indicating that the Audi climate control not working properly. These symptoms include:

• A/C System On/Off (ECO, AC): The system's "functionality -> cannot be switched on/activated" or its "functionality -> switches off by itself."
• Automatic Climate Control Mode (AUTO): The system's "functionality -> switches off by itself," "functionality -> cannot be activated," or displays "functionality -> misfire."
• Climate Control Unit Cooling Output: The system reports "component, automotive fluids -> too little" or "functionality -> no function."
• Parking Heating/Cooling: The system's "functionality -> switches off by itself" or "functionality -> cannot be switched on/activated."
• Manual Climate Control Mode: The system shows "functionality -> no function."
• Display Control Head for A/C System: The display indicates "functionality -> no function."
• Auxiliary Heater On: The system's "functionality -> cannot be switched on/activated."

Diagnosis

When a customer reports these symptoms, a workshop diagnosis can typically reproduce the complaint. Technicians will identify the pressure and temperature sensor in the refrigerant circuit as the root cause of the problem. The core issue is a hardware incompatibility involving sensors with different manufacturing indexes.

Technical Background

The underlying problem is a hardware issue with the pressure and temperature sensor itself. The TSB 2079243/1 indicates that certain sensors, specifically those with different manufacturing indexes, are not compatible with each other within the same system. This incompatibility prevents the climate control system from functioning as intended, leading to the observed malfunctions.

Important Warning Regarding Sensor Replacement

Audi provides a critical warning regarding the replacement of these sensors. If a sensor with index E is no longer available from the replacement parts warehouse, sensors with index J may be offered. However, it is crucial to note that sensors with index E and index J are not compatible. If a sensor is replaced with an index J version, all other sensors in the affected vehicle's refrigerant circuit must also be replaced with an index J sensor to ensure compatibility. If an index E sensor is currently installed and available, it must be ordered to maintain system integrity.

Repair Procedure Summary

The recommended repair for the Audi climate control not working issue involves replacing the faulty pressure and temperature sensor. This procedure must be performed according to the detailed instructions provided in the official Audi Workshop Manual. Technicians should ensure they follow all steps carefully, paying close attention to the specific sensor index requirements outlined in the TSB.

Warranty Information

Audi states that this Technical Service Bulletin (TSB) 2079243/1 is for informational purposes only. It is not applicable to any Audi Warranty. This means that repairs related to this issue may not be covered under the standard manufacturer's warranty, and owners should consult with their dealership regarding potential costs.

Additional Information

All part and service references within TSB 2079243/1 are subject to change. Technicians are advised to always check with their Parts Department and/or ETKA system for the most current information. Additionally, the Repair Manual should be consulted for specific fasteners, bolts, nuts, and screws that require replacement during the repair process.

---

Source: NHTSA ID: 11023807