Mazda CX-3 2016–2020 — technical service bulletin
Bulletin MT-004-20 · NHTSA communication 10183602 · issued Nov 3, 2020
Technical service bulletin
communication type
Equipment
component
2016–2020
model years
5
vehicle entries
Official summary
Some customers may complain about a tapping or knocking noise coming from the rear seat after fuel fill. The concern will likely occur if the fuel tank is overfilled (more fuel is added after the fuel pump nozzle shuts off automatically) or filled up normally in high ambient temperatures and the fuel expands.
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.