2021-2023 Audi A4, A5, Q5 Whistling Turbocharger TSB

Important Warning

Owners should be aware of a critical detail regarding this issue:

NOTICE: Replacing the turbocharger with one with an identical part number (part number 06N.145.702.D) will not fix the problem. Check ETKA for an alternative available part number.

This means that simply replacing the faulty turbocharger with another one of the same original part number (06N.145.702.D) will not resolve the whistling noise. Technicians must consult ETKA for an updated or alternative part number to ensure a successful repair.

Symptoms of Whistling Turbocharger

Owners of 2021-2023 Audi A4, A5, and Q5 models equipped with the 4-cylinder 2.0 TFSI engine may experience a distinct whistling noise emanating from the turbocharger. This noise is typically noticeable under specific driving conditions.

The whistling sound can be heard when accelerating or driving at a constant speed, particularly when the engine is operating in combustion mode. The issue often manifests between 1500 and 2200 RPM and at approximately 70% engine load. This Audi A5 whistling turbocharger issue can occur regardless of the selected transmission position.

Workshop findings indicate that the whistling noise has a frequency between 2.8 kHz and 3.2 kHz, which can be precisely measured using a PICO measurement tool.

Diagnosis and Trigger Conditions

To diagnose the whistling turbocharger, technicians will first attempt to duplicate the customer's concern. This involves test driving the vehicle under the reported conditions where the whistling noise is most prominent.

For accurate identification and analysis of the noise, the VAS tool 611015, also known as a PICO NVH tool, is recommended. This specialized tool allows for precise measurement of the noise frequency and helps confirm that the turbocharger is indeed the source of the whistling. Further details on using the PICO NVH tool for noise analysis can be found in TSB 2070568, which covers professional noise analysis for engine and gearbox issues.

Repair Procedure Summary

Audi Technical Service Bulletin 2071243/2 outlines the steps for addressing the whistling turbocharger. The process begins with a thorough noise analysis, ideally utilizing the VAS 611015 PICO NVH tool to confirm the turbocharger as the source of the noise.

Once confirmed, the primary repair involves replacing the turbocharger. It is crucial to note that the replacement turbocharger must not be of the identical part number (06N.145.702.D) that caused the original problem. Technicians are instructed to consult ETKA for an alternative, updated part number to ensure the issue is permanently resolved. After replacement, a road test is performed to verify the repair.

Required Tools and Parts

For the diagnosis and repair of the Audi A5 whistling turbocharger, specific tools and parts are necessary:

• VAS 611015 (PICO NVH tool): This specialized tool is essential for accurately identifying and measuring the whistling noise from the turbocharger.
• Turbocharger: A new turbocharger is required. It is critical that this replacement part is not the original part number 06N.145.702.D. Technicians must check ETKA for an alternative, updated part number.
• Fasteners, Bolts, Nuts, and Screws: These components may be needed as per the repair manual and should be sourced via ETKA/ELSA.

Always consult your Parts Department and/or ETKA for the latest information and parts bulletins to ensure the correct components are used.

Warranty Information

This Technical Service Bulletin 2071243/2 outlines warranty coverage for eligible vehicles. The claim type is generally covered for up to 48 months or 50,000 miles, whichever comes first.

For Certified Pre-Owned (CPO) vehicles, coverage falls under the G10 claim type, provided the owner is verified. If the vehicle is outside of any applicable warranty, this TSB serves as informational guidance only, and the repair costs would typically be borne by the owner. The service number associated with this TSB is 2130, and the damage code is 0020. Various labor operations are specified for diagnosis and replacement, including setup time for the PICO NVH tool and the actual turbocharger removal and installation.

Source: NHTSA ID 10251968