# Service bulletin 21F2 \- Bulletin

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.

- Type: Service bulletin
- NHTSA id: 10127763
- Published by NHTSA: 2018\-02\-05
- Manufacturer's number: 21F2 \- Bulletin
- Manufacturer's date: 2017\-06\-01
- NHTSA component: ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10127763-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10127763-0001.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Turbocharger or supercharger

## Vehicles listed

- 2013 to 2015 AUDI A6
- 2013 to 2015 AUDI A7
- 2013 to 2014 AUDI A8
- 2014 to 2015 AUDI RS 7
- 2013 to 2015 AUDI S6
- 2013 to 2015 AUDI S7
- 2013 to 2014 AUDI S8

## Recalls for the same vehicles and component

- [22V178000](/recalls/nhtsa/22V178000.md), 2022-03-23: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER

## Other bulletins for the same vehicles and component

- [Edition114](/bulletins/10231113.md), 2023-02-06, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Wastegate linkage dissconnected
- [141920349992](/bulletins/10216704.md), 2022-08-01, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. 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.
- [131320312454](/bulletins/10216699.md), 2022-08-01, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Under certain driving conditions, the linkage for the waste gate actuation can encounter excessive wear which leads to play at the waste gate flap. This leads to boost escaping through a loose flap, which sets DTC P0299 \(Negative Pressure Deviation\).
- [131220312453](/bulletins/10216698.md), 2022-08-01, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Under certain driving conditions, the linkage for the waste gate actuation can encounter excessive wear which leads to play at the waste gate flap. This leads to boost escaping through a loose flap, which sets DTC P0299 \(Negative Pressure Deviation\).
- [A2120362044640\_9](/bulletins/10182481.md), 2020-12-04, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ELECTRICAL SYSTEM:STARTER ASSEMBLY. 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.
- [A2119322034999\_4](/bulletins/10161603.md), 2019-07-09, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. This informational bulletin contains an explanation for a discolored pipe.
- [A211727 2044640](/bulletins/10133362.md), 2018-04-16, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:OTHER FUEL TYPES:TURBO/SUPERCHARGER. This bulletin contains detailed instructions and a worksheet for determining the damage on a turbocharger.
- [A211522 2039006\-](/bulletins/10128405.md), 2018-02-05, Service bulletin: ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. Supersedes Technical Service Bulletin Group 21 number 14\-21 dated November 26, 2014. The MIL is on. Customer may report a reduction in power. DTC P029900 \(Turbo/Super Charger Underboost\) is stored in the engine control module \(ECM\), J623 \(address word 01\). The circlip connecting the turbo wastegate actuator rod and the wastegate flap lever can fall off due to low tension of the clip. Consequently, the wastegate linkage becomes disconnected, causing MIL on and DTC P029900.
- [21F2 \- Dealer Le](/bulletins/10128375.md), 2018-02-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER. 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 \- Circular](/bulletins/10127765.md), 2018-02-05, Service bulletin: ENGINE AND ENGINE COOLING:ENGINE:GASOLINE:TURBO/SUPERCHARGER; ENGINE AND ENGINE COOLING. 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.

JSON: [/v1/bulletins/10127763](/v1/bulletins/10127763)

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