Mazda CX-5 2018–2020 — technical service bulletin
Bulletin 01-006-20-3695b · NHTSA communication 10183589 · issued Nov 4, 2020
Technical service bulletin
communication type
Equipment
component
2018–2020
model years
8
vehicle entries
Official 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.
Vehicles covered
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.