2021 Audi Lineup Pre Sense Warning TSB

Audi has issued Technical Service Bulletin (TSB) 90 20 37 2058077/3 to help technicians diagnose and address customer concerns about unexpected activations of the Audi pre sense system. This TSB, which supersedes an earlier bulletin (20-36), focuses on situations where the vehicle issues warnings, jolts, or engages brakes without an apparent hazard.

The Audi pre sense system is designed to enhance safety by detecting potential collisions and initiating preventative measures. However, some owners of 2021 Audi models have reported an unexpected Audi e-tron pre sense warning or intervention, leading to confusion and concern.

Symptoms

Owners may experience one or more of the following symptoms related to an unexpected Audi e-tron pre sense warning or intervention:

• Audi pre sense city warning: An audible or visual alert from the pre sense city system.
• Audi pre sense city warning jolt: A brief, unexpected brake activation.
• Audi pre sense city emergency stop: The vehicle performs an emergency stop without a clear obstacle.
• Audi pre sense front warning: An audible or visual alert from the pre sense front system.
• Audi pre sense front warning jolt: A brief brake activation from the pre sense front system.
• Audi pre sense front partial braking: The vehicle applies partial braking unexpectedly.
• Audi pre sense emergency braking: The vehicle performs emergency braking without a clear hazard.
• Intervention of emergency steer assist: The steering system intervenes unexpectedly.
• Intervention of turning assistant: The turning assistant system intervenes unexpectedly.
• The Audi pre sense symbol appears in the instrument cluster, accompanied by an audible warning.

Fault codes / DTCs

This Technical Service Bulletin does not list specific Diagnostic Trouble Codes (DTCs) associated with these unexpected pre sense interventions. Instead, it focuses on diagnostic procedures involving various control modules and test plans. Technicians will use the ODIS diagnostic system to evaluate the behavior of components like the Adaptive Cruise Control (J428), Front Camera for Driver Assist Systems (R242), Lane Change Assist Control Modules (J769, J770), Airbag Control Module (J234), and ABS Control Module (J104).

What the service bulletin says

The TSB instructs technicians to perform specific diagnostic steps based on the vehicle's model year and installed equipment. The primary method involves running an