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June 8, 2021 Service bulletin

In some of the affected vehicles, the engine's secondary timing chain tensioner may not have been properly...

Ford technical service bulletin 21B26-S1 for 2020 Ford Mustang.

Bulletin number
21B26-S1
Component
Engine and engine cooling
Summary
In some of the affected vehicles, the engine's secondary timing chain tensioner may not have been properly activated during assembly, which could result in a timing loss. Timing loss could lead to internal engine damage, a rough running engine , and engine misfires.

Owners of these vehicles have filed 27 complaints in the engine category.

Vehicles covered

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