Mazda CX-3 2016–2021 — technical service bulletin

Bulletin SA-047-21 · NHTSA communication 10201861 · issued Sep 16, 2021

Technical service bulletin

communication type

Engine and Engine Cooling

component

2016–2021

model years

vehicle entries

Official summary

If you receive a customer concern about the CHECK ENGINE light coming on and DTC P3400 (cylinder deactivation system malfunction) stored, the cylinder deactivation oil control valve may be plugged with plastic debris from the oil filter wrapper. The debris may enter the center of the oil filter when poking a hole in the filter wrapper during removal, and then travel through the engine and plug the cylinder deactivation oil control valve.

Vehicles covered

2016 Mazda CX-3
2017 Mazda CX-3
2018 Mazda CX-3
2019 Mazda CX-3
2020 Mazda CX-3
2021 Mazda CX-3
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.