2021 Audi EVAP System False Leak Detection

Symptoms of False EVAP Leak Detection

Owners of affected 2021 Audi vehicles, including the 2021 Audi Q8, may experience dashboard warnings related to the Evaporative Emission (EVAP) system. These warnings erroneously indicate a leak when no actual leak is present. This "false leak detection" is triggered by an internal defect within the EVAP leak detection pump. While the vehicle's performance may not be immediately impacted, these warnings can be concerning and may prevent successful emissions inspections.

Understanding the Issue

The core problem stems from an internal defect in the EVAP leak detection pump. This component is crucial for monitoring the EVAP system for fuel vapor leaks. When the pump malfunctions internally, it can erroneously report a leak, even when the system is sealed and functioning correctly. This leads to the "false leak detection" messages that owners might see. This issue affects the ENGINE AND ENGINE COOLING system.

Repair Procedure Summary

Audi has issued a manufacturer communication, identified by NHTSA ID 10210233, outlining a specific repair procedure to address this internal defect. The bulletin describes the necessary steps to rectify the problem with the EVAP leak detection pump. This repair aims to resolve the false leak detection issue, ensuring that the EVAP system can accurately monitor for leaks without generating incorrect warnings.

What Owners Should Do

If you own a 2021 Audi Q8 or another affected 2021 Audi model and are experiencing persistent EVAP system warnings or "false leak detection" messages, it is recommended to contact your authorized Audi dealership. Inform them about the symptoms and reference NHTSA communication 10210233. The dealership technicians will be able to diagnose the EVAP system and perform the necessary repair according to the manufacturer's guidelines.

Source: NHTSA Manufacturer Communication 10210233