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Service bulletin 9804

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id604438
Published by NHTSA1999-04-29
Manufacturer's number9804
Manufacturer's date1998-12-18
NHTSA componentENGINE AND ENGINE COOLING:ENGINE

NHTSA's summary

VEHICLE EXHIBITING A WHINING / WHIRRING TYPE NOISE AT CERTAIN MPH RANGES. *TT

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine

Vehicles listed
AUDI A41996, 1997, 1998

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
19981261998-06-22. Engine
98V1340001998-06-22. ENGINE AND ENGINE COOLING:COOLING SYSTEM

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
Edition922023-02-06. Service bulletin. Idenifying and mixing factory fill engine coolants
13352010043132022-08-01. Service bulletin. Engine oils that meet Audi Oil Quality Standards.
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1335202530322022-08-01. Service bulletin. Discontinuation and mixing of Audi-approved engine coolants.
A1915612025303-52018-02-05. Service bulletin. Supersedes Technical Service Bulletin Group 19 number 14-50 dated June 20, 2014. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have been replaced by an improved version. G12++ coolant (for service available) has been introduced in MY 2005 for all engines. G13 has been introduced in MY 2008 as factory filling and service.
A171782 2010043-2018-02-05. Service bulletin. This informational bulletin contains all the the Audi Oil Quality Standards that should be used when doing an oil change.
A191335 2025303-2017-11-17. Service bulletin. Supersedes Technical Service Bulletin Group 19 number 11-19 dated February 10, 2011. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have been replaced by an improved version. G12++ coolant (for service available) has been introduced in MY 2005 for all engines. G13 has been introduced in MY 2008 as factory filling and service.
A191562 2025303-2017-11-17. Service bulletin. Supersedes Technical Service Bulletin Group 19 number 15-61 dated July 7, 2015. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have been replaced by an improved version. G12++ coolant (for service available) has been introduced in MY 2005 for all engines. G13 has been introduced in MY 2008 as factory filling and service.
A191341 2025303-2017-11-17. Service bulletin. Supersedes Technical Service Bulletin Group 19 number 13-35 dated March 25, 2013. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have been replaced by an improved version. G12++ coolant (for service available) has been introduced in MY 2005 for all engines. G13 has been introduced in MY 2008 as factory filling and service.
A191450 2025303-2017-11-08. Service bulletin. Supersedes Technical Service Bulletin Group 19 number 13-41 dated June 20, 2013. Discontinuation and mixing of Audi-approved engine coolants. G11, G12, and G12+ coolants have been replaced by an improved version. G12++ coolant (for service available) has been introduced in MY 2005 for all engines. G13 has been introduced in MY 2008 as factory filling and service.