2020 BMW 330 Bulb Size

Goal: help you quickly identify correct bulb sizes for a 2020 BMW 330i when a light fails or during maintenance. The problem is inconsistent labeling and aftermarket variation, so the chart collects OEM references and common equivalents to reduce guesswork. This approach saves time and avoids buying mismatched bulbs. Prerequisites and step by step: use your owner’s manual as a primary reference, then cross-check the chart for socket type and wattage. The recommended action is to match both size and electrical spec, considering trade-off between brightness and longevity. Validate by installing one bulb and testing position, polarity where applicable, and warning lights. Troubleshooting and wrap up: if a bulb doesn’t fit or the beam is wrong, re-check the socket and wiring harness constraints and consult a dealer. Affiliate disclaimer: some links on this page are affiliate links, which may earn a commission at no extra cost to you.