2021-2024 Audi A6/S6/A7 EVAP Ticking Noise TSB

Owners of certain 2021-2024 Audi A6, A6 allroad, S6, A7, and S7 models may notice an unusual ticking or thumping noise emanating from the rear passenger compartment. This specific Audi A6 ticking noise rear seat issue is addressed by Audi Technical Service Bulletin (TSB) 2070153/1, which provides a clear diagnosis and repair procedure for technicians.

Symptoms of the EVAP Ticking Noise

Customers experiencing this issue typically report the following:

• "Ticking and/or thumping noises can be heard", primarily when sitting in the right rear seat.
• The "noises mostly occur at idling speed", indicating a vibration-related problem rather than a speed-dependent one.

If you hear an Audi A6 ticking noise rear seat or similar sounds, especially when the vehicle is idling, your vehicle might be affected by this condition.

Technical Background

Audi's workshop findings confirm that the root cause of this Audi A6 ticking noise rear seat is the activated charcoal filter solenoid, identified as N80. This solenoid vibrates the EVAP charcoal filter line, leading to the audible ticking and/or thumping noise that owners perceive in the rear passenger compartment.

Important Warnings for Repair

When performing the repair, technicians are advised to take a critical precaution:

• "Please ensure that no lines are pressed, crushed, or put under tension when you fit the parts." This warning highlights the importance of careful installation to prevent damage to the EVAP charcoal filter line or other components during the service.

Repair Procedure Summary

The repair outlined in TSB 2070153/1 involves a straightforward process to eliminate the vibration and the associated noise. The procedure includes:

1. Accessing the Area: The first step requires removing the wheel housing liner to gain access to the EVAP charcoal filter line.
2. Installing Sleeves: Technicians will then install 11 specialized sleeves, part number 4KD 201 255, onto the activated charcoal filter line. These sleeves are strategically placed in the area of the wheel housing liner to dampen vibrations.

This repair aims to isolate the EVAP charcoal filter line from the vibrating N80 solenoid, thereby resolving the Audi A6 ticking noise rear seat complaint.

Required Parts

To perform this repair, the following part is required:

• Part Number: 4KD 201 255
• Part Description: Sleeve
• Quantity: 11

Technicians should always consult their Parts Department and/or ETKA for the latest information and parts bulletins.

Warranty Information

This Technical Service Bulletin 2070153/1 details specific warranty claim types and labor operations for the repair:

• Claim Type: The repair is covered for vehicles up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, requiring owner verification.
• Informational Only: If the vehicle is outside of any warranty coverage, this TSB serves as informational guidance only.
• Service Number: 2024
• Damage Code: 0020
• Labor Operations:
  • Removing and installing the rear wheel housing liner: Labor operation code 6676 1900.
  • Repairing the activated charcoal filter line: Labor operation code 2022 4199, estimated at 20 Technical Units (TU).
• Diagnostic Time: Diagnostic time is listed as GFF with no allowance (0 TU).

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Source: NHTSA ID: 10235117, TSB 2070153/1