2021-2023 Audi e-tron Parking Aid Malfunction DTC B107BF0

Symptoms

Owners of affected 2021-2023 Audi vehicles may experience their parking aid system sporadically not working. This issue is often accompanied by a warning message displayed in the instrument cluster, stating: "Front/rear parking aid: Sensor view restricted because of environmental factors No obstacle warning". This indicates a potential problem with the parking aid system's ability to detect obstacles.

If you notice an Audi e-tron parking aid malfunction, it's important to have it diagnosed.

Fault Codes / DTCs

When the parking aid system malfunctions, one of the following Diagnostic Trouble Codes (DTCs) may be stored in the J1121 control module for driver assist systems (address word 00A5):

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

These codes specifically point to environmental factors affecting the performance of the parking aid sensors.

Technical Background

Audi's 6th generation ultrasound parking aid sensors, first introduced in the 2019 A8 (Type 4N), are designed to detect objects around the vehicle. However, these systems can be temporarily affected by external influences such as dirt, ice, or other external ultrasound signals. When such conditions are detected, the system may become temporarily unavailable to prevent false warnings, and a message will be displayed to the driver.

Important Warnings

• Do not replace parts prematurely: If the concern occurs sporadically, no further measures are necessary as it is caused by environmental influences. Replacement of the driver assistance systems J1122 without clear findings is not effective. Similarly, replacing the J1121 control unit will not resolve this issue, and claims for such replaced parts will be subject to review by Audi.
• Warranty coverage: If your vehicle is outside of warranty, this Technical Service Bulletin is for informational purposes only, and any repairs may not be covered.

Diagnosis and Repair Summary

If you are experiencing an Audi e-tron parking aid malfunction, a technician will perform a series of checks on the ultrasound sensors. These steps help determine if the issue is environmental or indicates a component fault.

Initial Checks:

1. Inspect for dirt, ice, foreign objects, stickers, or an improperly fitted license plate on the sensors.
2. Check for any damage to the bumper, air intake grille, or underbody that might indicate a parking impact.
3. Look for mechanical damage, such as stone chips and scratches, on the sensors.
4. Verify the proper fit of the sensors, bumpers, and surrounding trim.
5. Access the measured value block "Vibration time of parking aid sender" in the J1121 control module (address word 00A5) to observe for cyclic or dynamic changes when approaching an obstacle.

Scenario 1: Sporadic Concern If the parking aid issue occurs sporadically, it is likely caused by environmental factors. In this case, no further repair measures are typically necessary.

Scenario 2: Reproducible or Static Concern If the issue is reproducible or static, it suggests that one or more ultrasound sensors, their mountings, or associated circuits may be faulty. In this scenario, the technician will proceed with standard diagnostic procedures to pinpoint and repair the specific fault.

Warranty Information

This Technical Service Bulletin provides specific guidelines for warranty claims related to the parking aid system. Claims are generally applicable for vehicles up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, G10 claim types apply, requiring owner verification. The service number for this procedure is 9175, with a damage code of 0040. Labor operations for checking the parking aid sensor (9175 0199) are allocated 20 Technical Units (TU), and diagnostic time (GFF, 0150 0000) is capped at a maximum of 100 TU. Road tests before and after the service procedure have no allowance.

Owner Action

If your 2021-2023 Audi vehicle is displaying the