2021 Audi EVAP System False Leak Detection TSB

Owners of various 2021 Audi models might encounter an unexpected EVAP system leak warning, even when no actual leak is present. This issue, detailed in NHTSA Manufacturer Communication 10205901, points to an internal defect within the EVAP leak detection pump, leading to inaccurate diagnostic readings.

This technical service bulletin (TSB) addresses concerns for a range of 2021 Audi vehicles, providing guidance for technicians to accurately diagnose and resolve the problem. If you own a 2021 Audi and are experiencing an EVAP system fault, this information is crucial for understanding the potential cause.

Symptoms

The primary symptom of this issue is the illumination of a warning light or message indicating an EVAP system leak. Owners may observe this warning on their instrument cluster, suggesting a problem with the evaporative emissions system. Despite the warning, there is no actual fuel vapor leak from the system; the detection mechanism itself is faulty.

The Root Cause

The false EVAP system leak detection stems from an internal defect within the EVAP leak detection pump. This component, part of the ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) system, is responsible for monitoring the integrity of the fuel vapor recovery system. When the pump malfunctions internally, it can incorrectly report a leak, triggering the warning light.

What Owners Should Do

If your 2021 Audi displays an EVAP system leak warning, it is recommended to contact an authorized Audi dealership. Technicians can reference NHTSA Manufacturer Communication 10205901 to diagnose the issue. They will be able to determine if the false leak detection is due to the defective EVAP leak detection pump and perform the necessary repairs. Addressing this issue promptly can prevent unnecessary concern and ensure your vehicle's emissions system is functioning correctly.

Source: NHTSA ID: 10205901