It's a 194 wedge bulb. You remove the bulb by reaching underneath the running board where the light is and twist the plug/socket. Once the plug/socket is loose, pull it back from the running board and you can pull the bulb out of the socket. The bulb doesn't go straight into the running, it's at a slight angle. It might be easier to lie on your back and look up underneath the bulb. When I changed out the bulbs to LEDs, three of them I changed in less than a minute, but I struggled with the one by the driver's door for more than five minutes.