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This guide shows you how to replace the H4 halogen bulb in the front headlight of your Vespa GTS 125. Obtain an H4 halogen bulb. Lift the two rubber dust covers of the mirrors. Using a 2.5mm Allen key, unscrew the retaining screws of the oil reservoir covers, and with a 17mm spanner, unscrew the two mirrors. Now, carefully lift the Piaggio emblem located in front of the fairing with a flathead screwdriver, and using a star screwdriver, unscrew the retaining screw. Pull the upper part outwards and disconnect the electrical connector of the external temperature sensor. With the star screwdriver, unscrew the retaining screws of the headlight fairing; one is located under the headlight, and the other two are where the buttons are located. Release the fairing and pull it outwards. Disconnect the electrical connectors and place the headlight on a microfiber cloth. Remove the rubber seal behind the headlight and release the retaining clip of the bulb. When positioning the new bulb, avoid holding it by the glass part. Reassemble everything as per disassembly.

Updated on 9 March 2026 by ScegliAuto

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