Audi A4 2013–2014 — technical service bulletin
Bulletin 142120390062 · NHTSA communication 10216706 · issued Nov 26, 2014
Technical service bulletin
communication type
Power Train
component
2013–2014
model years
12
vehicle entries
Official summary
The circlip connecting the turbo wastegate actuator rod and the wastegate flap lever can fall of due to low tension of the clip. Consequently, the wastegate linkage becomes disconnected, causing MIL on and DTC P029900.
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.