Audi A5 2009–2013 — technical service bulletin
Bulletin 01134820330015 · NHTSA communication 10221995 · issued Dec 20, 2013
Technical service bulletin
communication type
Engine and Engine Cooling
component
2009–2013
model years
15
vehicle entries
Official summary
Under certain driving conditions, the secondary air ports in the cylinder head can accumulate carbon over time, causing a restriction.
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.