1996-2025 Audi A4: Software Updates and Safety Probes in May 2026

May 2026 presented a comprehensive overview of safety and technical information for the Audi A4, spanning across various model years from 1996 to 2025. The month's updates included a notable number of technical service bulletins (TSBs) for newer models, primarily focusing on Audi A4 software updates and minor component issues. Alongside these recent service actions, several historical NHTSA investigations for older Audi A4 vehicles were also highlighted, some of which previously led to recalls addressing critical safety concerns.

Recalls

No new recalls were filed for the Audi A4 in May 2026.

Owner Complaints

No new owner complaints were reported for the Audi A4 in May 2026.

Investigations

NHTSA's records for the Audi A4 in May 2026 included updates on several past investigations, some of which resulted in recalls, while others were closed after thorough review.

Two significant investigations for older models were noted as having resulted in recalls:

• An investigation identified as RQ99008 concerned the power brake booster vacuum bypass in 1997-1999 Audi A4 models. This probe ultimately led to a recall to address the safety issue.
• Similarly, RQ00009 focused on the ignition switch in 1996-1997 Audi A4 vehicles. This investigation was upgraded to a recall, indicating a confirmed safety defect and a forthcoming remedy.

Several other investigations were closed by NHTSA:

• PE08027 investigated engine stalling due to fuel pump failure in the 2004 Audi A4. NHTSA closed this investigation, noting a low incident rate and different causes compared to previous recalls, but committed to continued monitoring of complaints.
• PE00016 looked into reports of degraded braking performance in wet weather conditions on 1996-2000 Audi A4 models, specifically linking the issue to the electrical system. This investigation has since been closed.

Further investigations included:

• PE02008 was a preliminary evaluation into potential issues with the brake and clutch pedal bracket in certain 1998-2001 Audi A4 and A6 vehicles, examining durability and safety implications.
• EA04017 concluded an investigation into stuck-open throttles in 1998-1999 Audi A4 and A6 vehicles. While a recall was issued for A6 models, the failure rate for A4s was significantly lower.
• An Engineering Analysis, EA00021, explored degraded braking performance in wet weather for 1996-2000 Audi A4 vehicles, focusing on potential safety risks.

Service Bulletins

May 2026 saw the release of numerous technical service bulletins for recent Audi A4 models, primarily addressing software-related issues and minor mechanical annoyances. These TSBs provide crucial information for owners and technicians regarding common problems and their solutions.

One recurring theme addressed by Audi A4 software updates is related to lighting and electrical systems. Technical Service Bulletin 2065234/2 addresses a "tail lamp warning" and various diagnostic trouble codes (DTCs) such as B16D431, B16D631, B16D531, and B16D731 in the comfort module of 2021 Audi A4, S4, and A4 allroad vehicles. The issue is often due to overly sensitive monitoring, resolved by a software update.

Another significant software-related TSB is A0124432075598_1 for 2024-2025 A4 and A4 allroad models. This bulletin tackles issues where the "Remote engine start via myAudi app does not work or only works intermittently." A software update is outlined to restore proper functionality.

For 2023 Audi A4 models, Technical Service Bulletin 2077630/1 addresses a "Drive system fault" message accompanied by reduced power and DTC P065C00. This is identified as a known software issue in the engine control unit, with a solution expected by Q3 2025.

Owners of 2021-2024 Audi A4, A4 allroad, and S4 models might also experience rear windows reversing direction during one-touch closure. Technical Service Bulletin 2070094/2 links this to DTC B14874B and provides a simple door module power reset as a resolution.

Additionally, TSB 2067558/2 addresses an "unpleasant noise" when folding the electric exterior mirrors on 2021-2024 Audi A4, A4 allroad, and S4 models, caused by insufficient lubrication.

What Audi A4 owners should do

1. Stay Informed: Regularly check the NHTSA website and carandproblems.com for any new recalls or investigations that may affect your specific Audi A4 model year.
2. Address Warning Lights: If you experience a "tail lamp warning" or a "Drive system fault" message, especially with DTC P065C00, contact your authorized Audi dealer for diagnosis and potential software updates.
3. Report Issues: If your remote engine start is not working, or if your rear windows are reversing, inquire with your dealer about the relevant technical service bulletins, such as A0124432075598_1 and 2070094/2.
4. Listen for Unusual Noises: If you notice any