The pollen filter on the AYGO is an easy job to do and requires no tools, up under the dash on the passenger side is a white plastic panel, this is the end of the pollen filter, squeeze the ears on the white housing and pull out.. The pollen filter is a flexible housing and will bend as you pull it out, this was what i found, one very dirty filter ( on the left )... Filter cost is around £10, i bought mine as part of a service kit from Parts-King. A clean pollen filter should hel