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May 1, 2026 Service bulletin

This bulletin supersedes the previously issued bulletin(s) listed below

Mazda technical service bulletin 01-008-26 for 2014-2021 Mazda MAZDA3, 2013-2020 Mazda CX-5 and 2014-2020 Mazda MAZDA6 and others.

Bulletin number
01-008-26
Component
Power train
Summary
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 01-008/23 06/05/23 Some vehicles may exhibit rattling noises from the engine compartment and oil leakage from the drive belt auto tensioner. This may be caused by insufficient sealing at the drive belt auto tensioner damper when the auto tensioner fully operates under both high ambient temperature and high load conditions. To eliminate this concern, the shape of the drive belt auto tensioner damper has been changed. REPAIR PROCEDURE If the tensioner is found to be "No Good" after completing the Drive Belt Auto Tensioner Inspection, replace it with a modified part according to the instructions on MGSS online:

Owners of these vehicles have filed 409 complaints in the transmission category.

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