Audi A6 2013–2015 — technical service bulletin
Bulletin 21F2 - Circular · NHTSA communication 10127765 · issued Jun 28, 2017
Technical service bulletin
communication type
Engine and Engine Cooling
component
2013–2015
model years
18
vehicle entries
Official 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.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.