Mazda TSB #01-002-21-3767
2019 Mazda MAZDA3
Affected Component: ENGINE AND ENGINE COOLING
- Summary
- Some vehicle may exhibit a tapping noise from the engine during idling; etc., and synchronized to the engine rpm. The tapping noise may be caused by the switchable hydraulic lash adjuster (HLA), which may not work properly due to air bubbles accumulated in the oil passage in it.