2019-2024 Audi Parking Aid Fault DTC B107BF0

Revision History

Audi Technical Service Bulletin 91 23 81 2058769/6, issued on March 17, 2023, supersedes previous bulletin Group 91 number 21-51 dated November 17, 2021. This revision includes updates such as added model years to the header and clarification on warranty information, stating that the TSB is a technical tip. Earlier revisions, such as Revision 5 (November 17, 2021) and Revision 4 (May 18, 2021), also involved header revisions and added models.

Symptoms

Owners of affected 2019-2024 Audi vehicles may experience their parking aid system sporadically not working. This issue is typically accompanied by a specific warning message displayed in the instrument cluster.

The verbatim warning message an owner might see is: "Front/rear parking aid: Sensor view restricted because of environmental factors No obstacle warning". This message indicates a temporary issue with the parking aid system's ability to detect obstacles, and workshop findings confirm that this message is reproducible.

Fault Codes / DTCs

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

Code	Description	Symptom Code(s)	Module
B107BF0	Rear parking aid sender, malfunction because of environment influences	233479, 233473	J1121 (driver assist systems)
B10FCF0	Front parking aid sender, malfunction because of environment influences	233523, 233472	J1121 (driver assist systems)

These symptom codes further specify the nature of the temporary partial availability. For instance, symptom codes 233479 and 233523 relate to temporary partial availability due to environmental influences like external ultrasound signals from street sweepers or construction equipment. Symptom codes 233473 and 233472 point to environmental factors such as dirt or ice affecting the sensors. If you're experiencing an Audi e-tron parking aid fault, these codes are key indicators.

Technical Background

Audi's 2019-2024 models, including those affected by this Audi e-tron parking aid fault, utilize new 6th generation ultrasound parking aid sensors, first introduced in the 2019 A8 (type 4N). This advanced system is designed to detect problems caused by external influences.

These external factors can include dirt, ice, or other external ultrasound signals. When the system detects such conditions, it temporarily disables the parking aid to prevent false warnings to the driver, displaying the aforementioned message in the instrument cluster. This temporary unavailability is a design feature to ensure system reliability under adverse conditions.

Important Warnings for Owners

Audi has provided specific guidance regarding this parking aid issue:

• Do Not Replace J1121 Control Unit: If the parking aid concern occurs sporadically and no clear findings indicate a fault with the driver assistance systems J1121 control unit, its replacement is not effective and will not resolve the issue. Claims for replaced J1121 parts without clear findings will be subject to review by Audi.
• Warranty Coverage: This Technical Service Bulletin is informational only and is not applicable to any Audi warranty. This means that diagnosis and any necessary repairs related to this specific TSB may not be covered under your vehicle's standard warranty.

Diagnosis and Repair Procedure Summary

For technicians, the service procedure involves a series of checks on the ultrasound sensors, depending on whether the concern is sporadic or consistently reproducible.

If the concern occurs sporadically: No further measures are necessary, as the issue is considered to be caused by environmental influences. The system is designed to temporarily restrict sensor view under such conditions.

If the concern is reproducible or static: This indicates a potential fault with one of the ultrasound sensors, their mountings, or associated circuits. Standard diagnostic procedures should be followed, including:

1. Visual Inspection: Check the respective ultrasound sensors for dirt, ice, foreign objects, stickers, or an improperly fitted license plate.
2. Damage Assessment: Inspect the bumper, air intake grille, and underbody for any damage that might indicate an impact during parking. Also, check for mechanical damage like stone chips and scratches.
3. Sensor Fitment: Verify the proper fit of the sensors, bumpers, and trim in the surrounding areas.
4. Measured Value Block Check: Access the measured value block "Vibration time of parking aid sender" in the J1121 control module (address word 00A5). Observe for a cyclic or dynamic change in the measured values when an obstacle is approached. A significantly increased frequency counter within standard ambient conditions for the respective fault code can indicate a malfunction.

Required Tools or Parts

This TSB does not specify any special tools or part numbers for repair, focusing instead on diagnostic checks and environmental factors. Technicians should always consult their Parts Department and ETKA for the latest information on parts bulletins and the Repair Manual for fasteners, bolts, nuts, and screws that require replacement during any repair.

Owner Action

If you experience an Audi e-tron parking aid fault or the warning message "Front/rear parking aid: Sensor view restricted because of environmental factors No obstacle warning", it is advisable to first check your vehicle's sensors for any obvious obstructions like dirt, ice, or foreign objects. If the issue persists or is consistently reproducible, contact your authorized Audi service center for diagnosis. Be aware that this specific issue may not be covered under warranty.

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Source: NHTSA ID: 10233733