How do you change a citroen c3 passenger side headlight?

Take the front grille off, lower the front bumper, remove the inner wing liner - this will allow you access to the bolts securing the headlight - remove headlight, replace bulb then refitting is reverse of removal. What a task - but the obloy way to do it!

this isn't the only way to do it,

there is a metal clip round the back of the headlight, unclip this and remove the back cover to the light (you may need to take the casing off the battery compartment to get your hands in) but you are in.

its a fiddle, with much done on sense of touch, but im sure much easier that removing bumpers!

Answer 1 is correct for the original question - that is, "how to change the headlight" (more or less) but the wing liners need to be released first to gain access to the rearmost bumper retaining bolts. Taking off the grille is nerve-wracking as it needs a very firm pull upwards to overcome the clips on the inside edges of the headlamps, but there is no easy way to open the clips up to make it easier as they are tucked in behind the grille.

Answer 2 only addresses the issue of changing bulbs, not complete headlight units. Recommended accessory is a compact mirror so that you can get some view of the bulb-retainers! When refitting the cover, smear the seal with petroleum jelly and make absolutely sure that the cover is seated correctly before securing the clip. Any water allowed in due to bad sealing will steam up the headlight and eventually destroy the orange coating on the indicator bulb, so you will be back to square one.