How do you change sparkplugs on a Citroen C5 V6?

To change the spark plugs on a Citroën C5 V6, first, ensure the engine is cool and disconnect the battery. Remove the engine cover if present, and then carefully detach the ignition coil packs by unscrewing them and pulling them out. Use a spark plug socket to unscrew the old spark plugs, replace them with new ones, and reassemble the ignition coils and engine cover. Finally, reconnect the battery and start the engine to ensure everything is functioning properly.