Hyundai Santa FE 2018–2021 — service campaign
Bulletin 25-01-087H-1 TSB · NHTSA communication 11027005 · issued Dec 15, 2025
Service campaign
communication type
Engine
component
2018–2021
model years
8
vehicle entries
Official summary
Certain Santa Fe (TMA), Sonata (LFA) and Tucson (TL) vehicles equipped with Theta II engines may exhibit elevated engine-out emissions. This bulletin provides instructions for updating the Engine Control Module (ECM) to address this condition.
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.