2025-2026 Audi A5/Q5/S5/SQ5 High Fuel Consumption TSB

Owners of certain 2025-2026 Audi A5, S5, Q5, and SQ5 models may notice an inaccurate and implausibly high average fuel consumption reading displayed in their vehicle's on-board computer. This issue, detailed in Audi Technical Service Bulletin (TSB) 2079967/3, specifically affects the long-term memory function of the on-board computer, leading to misleading fuel economy data. This TSB was released on December 18, 2025, and supersedes the previous Pending Service Solution (PSS) TSB 2078354, which also addressed the "Average consumption shown in long-term memory of on-board computer implausibly high" condition.

Symptoms of Implausibly High Fuel Consumption

After a mileage of 2,668 miles or more, the on-board computer's long-term memory may suddenly display an implausibly high average consumption. This reading can range from 8 gal./62 miles to 26 gal./62 miles. This occurs after the ignition (terminal 15) is switched off and then on again. While the displayed average consumption may decrease as the vehicle is driven further, it remains significantly too high compared to actual fuel usage. The on-board computer's short-term memory is not affected by this issue, as it automatically resets itself after the vehicle has been left standing for two hours.

Technical Background and Root Cause

The root cause of this implausibly high average consumption is a software issue within the HCP3 (high-performance computing platform), specifically affecting cluster 3. This software anomaly leads to incorrect calculations and storage of long-term fuel consumption data.

Repair Procedure Summary

The solution to this problem involves updating the vehicle's software. An optimized software version, 4361, has been introduced for the HCP3, which is identified by diagnostic address 005F. The repair procedure requires following the detailed directions outlined in TSB 2079690, titled "00 Combined software update 03.10.00/C (28.13.01) KD2." This update ensures the on-board computer accurately calculates and displays average fuel consumption, resolving the Audi A5 high fuel consumption issue.

Warranty Information and Labor Operations

This Technical Service Bulletin (TSB) 2079967/3 outlines specific warranty claim procedures for dealers. The Service Number for this operation is 9196, and the Damage Code is KD02. For vehicles still under warranty, the repair is covered, and claims must adhere to the Audi Warranty Policies and Procedures Manual.

Specific labor operations for this service include:

• 0151 0010: Software update, including connecting a battery charger. Technicians should refer to the Standard Repair Time (SRT) for associated operations.
• 0151 0040: A fixed rate for the software update, covering all required preliminary and follow-up work. This includes tasks such as bus sleep cycle, calibration drives, and additional work, and is allocated 130 Time Units (TU).
• 0150 9999: In cases where a flash abort occurs, an additional lump sum of 50 TU can be claimed per flash cancellation, for each documented attempt.

The Claim Comment specifies "As per TSB 2079967/3." When performing the combined software update, time stamps are not required for billing under warranty, allowing technicians to work on other vehicles simultaneously. Non-productive personnel are also permitted to perform this update.

Important Warnings for Owners

Owners should be aware that if their vehicle is outside of any warranty, this Technical Service Bulletin is informational only, and repair costs may apply. Audi of America, Inc. reserves the right to change parts and service references mentioned in this TSB. Owners or technicians should always check with their Parts Department and/or ETKA for the latest information and parts bulletins. Additionally, the Repair Manual should always be consulted for fasteners, bolts, nuts, and screws that require replacement during the repair.

NHTSA ID: 2079967/3