Hyundai Kona 2021 — service campaign
Bulletin 9D1 OL · NHTSA communication 11037496 · issued Sep 22, 2026
Service campaign
communication type
Engine
component
2021
model years
1
vehicle entries
Official summary
Hyundai has become aware that certain Kona vehicles equipped with 1.6T-GDI engines may not meet engine-out NOx (Nitrogen Oxides) and Particulate Matter (PM) emission standards.
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.