Citroen C3 pollen filter removal and replacement (cabin filter)
Citroen c4 petrol and diesel pollen filter change - YouTube
6447XF 1609998980 For Citroen C4 Grand Picasso Berlingo Peugeot 3008 5008 Partner Car Pollen Cabin Air Conditioning AC Filter X2|Cabin Filter| - AliExpress
FAQ : 225 : Find the location of the C4 Picasso Pollen Filters - C4 - DS4 Owners