Hyundai Sonata 1999–2002 — technical service bulletin
Bulletin 0336019 · NHTSA communication 10004433 · issued Aug 1, 2003
Technical service bulletin
communication type
Engine and Engine Cooling
component
1999–2002
model years
4
vehicle entries
Official summary
Ecm (engine control module) reprogramming for engine hesitation in the morning and diagnostic trouble code p0139. *tt
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.