2021 Volkswagen Jetta GLI Bulb Size

Problem: using the wrong bulb size can leave you stranded or cause electrical issues. This bulb size list for the 2021 Volkswagen Jetta GLI is designed to remove guesswork by matching each exterior and common interior lamp to the recommended socket sizes, with assumptions about factory trim and stock wiring. Prerequisites: confirm your vehicle year, trim, and whether lighting has been upgraded. The step-by-step approach shows where each bulb fits, offers validation tips for fit and polarity, and notes trade-offs when choosing brighter aftermarket options versus OEM compatibility. Some links on this page are affiliate links, which means I may earn a commission at no extra cost to you. If a bulb does not fit or work as expected, recheck part numbers, test the socket, and consult repair manuals for troubleshooting. This should leave you confident to buy and install the correct bulbs.