Sprinter 2500 2004–2006 — technical service bulletin
Bulletin T21 Combo Rev4 · NHTSA communication 10190682 · issued Mar 12, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2004–2006
model years
6
vehicle entries
Official summary
Emissions Recall T21 Reprogram Engine Control Unit
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.