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Service bulletin A21162320349993

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 id10095634
Published by NHTSA2017-03-17
Manufacturer's numberA21162320349993
Manufacturer's date2016-08-02
NHTSA componentENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER

NHTSA's summary

THIS TECHNICAL SERVICE BULLETIN EXPLAINS WHY THE IMPELLER SIDE OF THE BANK 2 TURBOCHARGER LOOKS DISCOLORED.

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, Turbocharger or supercharger

Vehicles listed
AUDI A82013, 2014, 2015, 2016, 2017
AUDI RS 72014, 2015, 2016, 2017
AUDI RS72013
AUDI S62013, 2014, 2015, 2016, 2017
AUDI S72013, 2014, 2015, 2016, 2017
AUDI S82013, 2014, 2015, 2016, 2017

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

Recalls for the same vehicles and component
22V1780002022-03-23. ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER

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
1419203499922022-08-01. Service bulletin. The crankcase breather is only connected to the bank 2 turbocharger inlet. Blow-by gases from the crankcase breather discolor the pipe (Figure 1). This is a normal condition.
A2120362044640_92020-12-04. Service bulletin. This bulletin contains repair instructions for when the engine cannot be started or it is difficult, there is unusual noises when accelerating and/or there is reduced engine performance.
A2120352059258_12020-05-07. Service bulletin. This bulletin contains instructions for diagnosing a damaged turbocharger and calling TAC.
A2119322034999_42019-07-09. Service bulletin. This informational bulletin contains an explanation for a discolored pipe.
A211931 2044640-2019-05-28. Service bulletin. This bulletin contains repair instructions for when the engine cannot be started or it is difficult, there is unusual noises when accelerating and/or there is reduced engine performance.
A211727 20446402018-04-16. Service bulletin. This bulletin contains detailed instructions and a worksheet for determining the damage on a turbocharger.
21F2 - Dealer Le2018-02-05. Service bulletin. On Audi vehicles with 4.0L TFSI engines manufactured within a specific period, the O-rings in the coolant lines for the turbocharger may be damaged. This can result in leaks between the coolant lines and the turbocharger.
21F2 - Circular2018-02-05. Service bulletin. On Audi vehicles with 4.0L TFSI engines manufactured within a specific period, the O-rings in the coolant lines for the turbocharger may be damaged. This can result in leaks between the coolant lines and the turbocharger.
21F2 - Bulletin2018-02-05. Service bulletin. On Audi vehicles with 4.0L TFSI engines manufactured within a specific period, the O-rings in the coolant lines for the turbocharger may be damaged. This can result in leaks between the coolant lines and the turbocharger.
21F2 - Bulletin2018-02-05. Service bulletin. On Audi vehicles with 4.0L TFSI engines manufactured within a specific period, the O-rings in the coolant lines for the turbocharger may be damaged. This can result in leaks between the coolant lines and the turbocharger.