Audi A3 2004–2011 — technical service bulletin
Bulletin 133920247843 · NHTSA communication 10216660 · issued May 28, 2013
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2011
model years
13
vehicle entries
Official summary
Deposits or coolant residues obstruct the electric transition on the sensor in the reservoir. This affects the coolant level display
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.