2021-2023 Audi Parking Aid Malfunction TSB

Symptoms

Owners of affected 2021-2023 Audi vehicles may notice their parking aid system not working reliably. The most common indication is a warning message appearing in the instrument cluster. This message states: "Front/rear parking aid: Sensor view restricted because of environmental factors No obstacle warning". This indicates that the system's sensors are temporarily impaired, preventing accurate detection of obstacles.

Fault Codes / DTCs

When the parking aid system malfunctions, the driver assist systems control module, J1121 (address word 00A5), may store specific Diagnostic Trouble Codes (DTCs). These codes point to issues with the parking aid senders, often due to environmental influences.

Code	Description	Symptom Codes
B107BF0	Rear parking aid sender, malfunction because of environment influences	233479, 233473
B10FCF0	Front parking aid sender, malfunction because of environment influences	233523, 233472

These symptom codes further specify the nature of the environmental influence:

• 233479/233523: Temporary partial availability of the system due to external ultrasound signals from sources like street sweepers or construction equipment.
• 233473/233472: Temporary partial availability of the system due to dirt or ice.

Diagnosis and Trigger Conditions

The 6th generation ultrasound parking aid sensors, first introduced in the 2019 Audi A8 (type 4N), are designed to detect external influences such as dirt, ice, or other ultrasound signals. When these conditions are present, the system may become temporarily unavailable to prevent false warnings. This results in the display of the "Front/rear parking aid: Sensor view restricted because of environmental factors No obstacle warning" message.

Technicians will perform checks on the ultrasound sensors, looking for common environmental factors. The Audi parking aid B107BF0 or B10FCF0 codes indicate that the system is functioning as designed by temporarily restricting its view under adverse conditions.

Repair Procedure Summary

For a sporadic Audi parking aid B107BF0 or B10FCF0 issue, technicians should perform a series of checks on the ultrasound sensors. These checks include:

• Inspecting for dirt, ice, foreign objects, stickers, or an improperly fitted license plate that might obstruct the sensors.
• Checking for physical damage on the bumper, air intake grille, and underbody that could indicate an impact during parking.
• Looking for mechanical damage such as stone chips and scratches on the sensors or surrounding areas.
• Verifying the proper fit of the sensors, bumpers, and trim.
• Checking the measured value block "Vibration time of parking aid sender" in the J1121 control module for dynamic changes when approaching an obstacle.

If the concern occurs sporadically and is clearly due to environmental factors, no further measures are necessary. However, if the issue is reproducible or static, indicating a persistent fault, standard diagnostic procedures for faulty ultrasound sensors, mountings, or circuits should be followed.

Important Warnings

It is crucial to note that if the parking aid concern occurs sporadically due to environmental factors, replacement of the driver assistance systems J1122 without clear findings is not effective. Part replacement of the J1121 does not solve this issue. Claims for replaced parts will be subject to review. This means technicians should not replace components unnecessarily if environmental factors are the root cause.

Warranty Information

This Technical Service Bulletin (TSB 2058769/4) outlines warranty coverage for addressing the Audi parking aid B107BF0 and B10FCF0 issues. The claim type is 110, covering vehicles up to 48 months or 50,000 miles. For CPO (Certified Pre-Owned) vehicles, the claim type is G10, requiring owner verification. If the vehicle is outside of warranty, this TSB serves as informational guidance only. The service number is 9175, with a damage code of 0040. Labor operations include checking the parking aid sensor (9175 0199, 20 TU) and diagnostic time (GFF, 0150 0000, max 100 TU).

NHTSA ID: 10194378