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May 5, 2021 Service bulletin

If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...),...

Mazda technical service bulletin MT-001-21 for 2007-2021 Mazda MAZDA3, 2013-2021 Mazda CX-5 and 2007-2021 Mazda MAZDA6 and others.

Bulletin number
MT-001-21
Component
Engine and engine cooling
Summary
If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal Workshop Manual diagnosis. Aftermarket devices may be the cause of the electrical concern. Ask the customer if any aftermarket devices have been installed.

Owners of these vehicles have filed 1,860 complaints in the engine category.

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