2021 BMW X4 Bulb Size

tl;dr: This bulb size chart lists the exact lamp types for a 2021 BMW X4, front to rear and interior to exterior. Use it to pick the correct replacements quickly and avoid fitment errors. My recommendation is to confirm the chart against your vehicle VIN and order the matching part numbers. Using the right bulbs restores visibility and system compatibility. It reduces installation time and the chance of dashboard warnings. A practical gotcha: some LED upgrades need adapters or coding. Incorrect bulbs can blow fuses or trigger vehicle alerts. Next steps: check your VIN, compare the chart, and follow the installation checklist. I may earn a small commission if you buy through links on this page; that supports maintaining accurate fitment data and keeps the guide free.