Mercedes-Benz A 220 2020 — technical service bulletin
Bulletin NCU-2020120003 · NHTSA communication 10186155 · issued Dec 11, 2020
Technical service bulletin
communication type
Engine
component
2020
model years
2
vehicle entries
Official summary
Correct tightening torque of threaded connection between exhaust system and catalytic converter
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.