2023-2024 Audi A4/A5/Q5/A3/Q3 Common Issues & DTCs

Audi has released an On-car analysis list, dated September 10, 2024, detailing several common issues and their recommended initial steps for diagnosis and repair. This communication, identified by NHTSA ID 11009206, provides guidance for technicians on various topics affecting multiple Audi models.

Gas Cap Seal Deformation (DTC P045600)

Symptoms: Owners of certain Audi models may experience an illuminated check engine light, indicating a potential evaporative emissions system leak. The underlying cause could be a deformed gas cap seal.

Fault Codes: The specific diagnostic trouble code associated with this issue is P045600, which indicates a "very small Leak" has been detected in the system.

Diagnosis and Repair: For 2023-2024 Audi A4, A5, and Q5 vehicles, if the DTC P045600 is present, technicians should visually inspect the gas cap to check if its seal is deformed. If deformation is confirmed, a Technical Assistance Center (TAC) case should be opened, and the requested information provided to Audi for further guidance. Addressing the Audi A5 P045600 fault typically starts with this visual inspection.

O2 Sensor Slow Response (DTC P013B00)

Symptoms: While not explicitly stated, an O2 sensor issue can lead to various engine performance problems, reduced fuel efficiency, or an illuminated check engine light.

Fault Codes: The specific DTC identified is P013B00, indicating a "Sensor Bank1-Sensor2 Slow Response - Lean to Rich" condition.

Diagnosis and Repair: For 2023-2024 Audi A5 and Q5 models equipped with DPAA or DPVA engines, technicians must first verify the presence of DTC P013B00. After verification, contact the Technical Assistance Center (TAC) for further instructions. Audi notes that an onsite visit may be necessary to resolve this issue.

MIB3 Infotainment System Stuck on Loading Screen

Symptoms: Owners of affected vehicles may find their MIB3 infotainment system stuck on the "loading user information" screen during vehicle bootup. During this time, user interaction with the system is not possible, although the backup camera typically continues to function normally.

Diagnosis and Repair: This issue specifically affects 2024 Audi A3 and Q3 models. If the infotainment screen is stuck on "loading user information" and user interaction is disabled, technicians should contact the Technical Assistance Center (TAC) for possible data logger installation to diagnose the root cause.

Inoperative Roof Panel Buttons

Symptoms: For certain Audi Q4 e-tron vehicles, owners may experience unresponsive roof panel buttons. This can manifest as "Dome light buttons unresponsive or come on with no input" and "Sunroof buttons are unresponsive", often occurring together.

Diagnosis and Repair: This issue applies to 2022-2024 Audi Q4 e-tron models. For detailed instructions on diagnosing and repairing inoperative roof panel buttons, technicians are directed to consult a specific worksheet.

Important Warnings for Technicians and Owners

Audi emphasizes that the Audi Helpline should be contacted before attempting any repairs related to these issues. Furthermore, as of June 7, 2024, worksheets will no longer be standard practice and will only be required if specifically listed in the topic details, as is the case for the roof panel buttons issue.

Owner Action

If you own a 2023-2024 Audi A4, A5, Q5, A3, Q3, or a 2022-2024 Audi Q4 e-tron and are experiencing any of the symptoms described, such as an illuminated check engine light with DTC P045600, or issues with your infotainment system or roof panel buttons, it is recommended to contact your authorized Audi dealership. They have access to the latest technical information and can properly diagnose and address these concerns.

NHTSA ID: 11009206