Mazda MAZDA3 2019–2021 — technical service bulletin
Bulletin SA-023-21 · NHTSA communication 10189947 · issued Mar 16, 2021
Technical service bulletin
communication type
Exterior Lighting
component
2019–2021
model years
3
vehicle entries
Official summary
Some customers may complain about any of the following: Warning light, Warning message, Headlight(s) inoperative, Cannot shift out of Park, Many DTC's stored, Module communication errors
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.