I have a 2004 vauxhall 1400 petrol corsa sxi ecotec on which I want ot replace the pollen filter, has any of your selves done this task before and how hard is it?
At the base of the screen - bonnet up - you'll see a central plastic cover with 2 torx screws.
Remove the rubber strip above it, screws out, move the battery cables out of the way and remove the cover.
Slide the filter out, look for flow direction arrows and replace.
John