Why this topic matters
SIB 17 01 21 includes F22/F23 and identifies the line between the cylinder head and expansion tank. Its scope is defined by listed models, production dates and BMW’s affected-vehicle records.
Sources 1
A useful first check
Gather the identifiers
Have the VIN, engine identification and production date ready. Ask a BMW service center to check the action’s applicability and whether it was already completed.
Describe any coolant loss
Record warning messages, the cold level history and visible residue without disturbing hoses. Tell the technician whether loss appeared suddenly or returned after topping up.
Do not turn a campaign into a diagnosis
An eligible car can still have another leak. A completed service action also does not prove the rest of the cooling system is sound. Request the actual leak finding and current VIN-specific repair information before ordering parts.
What not to buy from this page
No historical part number, universal coolant specification or bleeding procedure is supplied here. The service record and current application-specific instructions should determine the repair.
Sources / references 1
- BMW — SIB 17 01 21, February 7, 2022 ↗Reviewed Sep 27, 2026
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