2021-2022 Audi Models CNG Message TSB

Audi has released Technical Service Bulletin (TSB) 90 22 53 2066620/1 to address a specific concern affecting various 2021-2022 Audi models, including the Audi e-tron. Owners may observe an incorrect "CNG inspection" or "CNG mode active" message appearing briefly on their instrument cluster. This TSB provides guidance for technicians and informs owners about the current status of this issue.

Symptoms

Owners of affected Audi vehicles may notice the following messages displayed on their instrument cluster:

• "CNG inspection"
• "CNG mode active"

These messages appear sporadically, even though the vehicle is not equipped with a Compressed Natural Gas (CNG) engine. The warnings typically disappear after the ignition is cycled off and on again. This is a visual anomaly and does not indicate an actual problem with a CNG system.

Technical Background

According to Audi, this condition is currently "Under investigation." This means that Audi engineers are actively working to diagnose the root cause of these erroneous messages and develop a permanent solution. The TSB notes that there is currently "No relevant DTCs are stored" when this condition occurs, indicating that the vehicle's diagnostic system does not register a fault code related to the warning.

Important Warnings

Audi has issued a critical instruction to technicians and, by extension, to owners regarding this issue:

• "Do not replace any components for this condition since this will not resolve the customer's concern."

This warning is crucial as it prevents unnecessary and potentially costly parts replacements that will not fix the underlying software or communication glitch causing the Audi e-tron CNG message.

What Owners Should Do

If you experience the Audi e-tron CNG message or similar warnings in your affected Audi model, it's important to understand the current status and recommended actions:

• No immediate repair: As the issue is under investigation, there is no repair procedure available at this time. Technicians are instructed not to replace any components.
• Solution timeline: Audi anticipates a solution to be available by the end of the first quarter of 2023. However, this timeline is subject to change.
• Report the issue: If your vehicle displays these messages, inform your Audi dealership. Technicians are advised to create a Pending Service Solutions (PSS) record in the PSS application. This helps Audi track the prevalence of the issue and gather data for their investigation.

This TSB is informational and does not apply to any Audi Warranty claims, as it primarily addresses an ongoing investigation rather than a confirmed defect with a repair.

NHTSA ID: 10209263