DIY preparation
Inspect lights and match an accessible replacement bulb
Check every light and identify bulb type before touching an electrical connector.
Inspect before dismantling
With the car parked safely, ask a helper to check sidelights, indicators, brake lights and the appropriate headlamp modes from a safe position. Record which function fails. Multiple failed lamps, burning smells, heat damage or recurring fuse failures need an auto electrician rather than repeated bulb replacement.
Confirm the actual lamp assembly
Compare the old bulb’s markings, base, voltage and wattage with the approved replacement for the installed lamp. A sealed-beam unit, converted headlamp, LED driver or xenon/high-voltage system is not an ordinary bulb swap. Do not fit a higher-wattage bulb, bypass a fuse or alter the wiring.
An accessible conventional bulb
Only proceed when the vehicle/lamp instructions describe owner replacement and you understand the connector. Switch lights and ignition off, remove the key and allow the bulb to cool. Follow the maker’s isolation and access instructions; never probe a live socket. Release the intended holder or retaining clip without pulling wiring. Fit the identical specified bulb with clean handling; avoid touching halogen glass.
Reassemble and test
Refit covers and weather seals as specified and test the lamp from the driver’s seat after reassembly. If it still fails, a socket or wiring fault may be present. Headlamp alignment, damaged connectors and uncertain polarity or conversions need a workshop. Do not drive in conditions requiring a failed safety light.