Service bulletins for the 2021 BMW X4
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
168 on file from NHTSA, as of 2026-10-19.
By type
By component
Only bulletins with component: Wiring and fuses are shown. Show all
| SIB 64 03 21 | 2021-10-25. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASH; EQUIPMENT ADAPTIVE/MOBILITY. After replacing the microfilter during a previous service, the customer notices that the ventilation system airflow rate is noticeably less. This leads to perceived lower cooling power. The customer may also notice that external odors enter the vehicle. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.