Service bulletins for the 2019 Mazda Mazda3
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
827 on file from NHTSA, as of 2026-10-19.
About P3400 on the 2019 Mazda Mazda3: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P3400 are shown. Show all
| SA-047-21 | 2021-10-05. Service bulletin. ENGINE AND ENGINE COOLING. 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. |
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| SA-061-20a | 2020-10-05. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING. If you receive a customer concern about the CHECK IN 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. |
| SA-061-20 | 2020-09-01. Service bulletin. ENGINE AND ENGINE COOLING. If you receive a customer concern about the CHECK IN light coming on and DTC P3400 (cylinder deactivation system malfunction) stored, perform the inspection in the Repair Procedure. |
| SA-015-19a | 2019-05-30. Service bulletin. POWER TRAIN; ENGINE. If you receive a customer concern with the check engine light coming on and DTC P3400 (cylinder deactivation system malfunction) stored, perform the inspection in the Repair Procedure. |
| SA-015-19 | 2019-04-25. Service bulletin. ENGINE. If you receive a customer concern with the check engine light coming on and DTC P3400 (cylinder deactivation system malfunction) stored, perform the inspection in the Repair Procedure. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.