Mazda CX-30 2018–2021 — technical service bulletin

Bulletin SA-031-21b · NHTSA communication 10202772 · issued Oct 13, 2021

Technical service bulletin

communication type

Power Train

component

2018–2021

model years

vehicle entries

Official summary

A new cylinder head assembly for service parts has been newly established for SKYACTIV-G 2.5 with cylinder deactivation when replacement is needed. Valves, valve springs, valve spring seats, and cotters (IN/EX) are included in the new assembly.

Vehicles covered

2020 Mazda CX-30
2021 Mazda CX-30
2018 Mazda CX-5
2019 Mazda CX-5
2020 Mazda CX-5
2021 Mazda CX-5
2019 Mazda MAZDA3
2020 Mazda MAZDA3
2021 Mazda MAZDA3
2018 Mazda MAZDA6
2019 Mazda MAZDA6
2020 Mazda MAZDA6
2021 Mazda MAZDA6

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.