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February 1, 2022 Service bulletin

The quick disconnect coupling on the cylinder head coolant vent line could break at the cylinder head

BMW technical service bulletin B170121 for 2017-2018 BMW X5, 2012-2016 BMW 328I and 2017-2018 BMW X3 and others.

Bulletin number
B170121
Component
Engine and engine cooling
Summary
The quick disconnect coupling on the cylinder head coolant vent line could break at the cylinder head. This would lead to loss of coolant from the engine.

Owners of these vehicles have filed 925 complaints in the engine category.

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