It used to be easy to change most Ford pollen filters, a couple of screws and it was there, under the bonnet. But that was too easy, so they have changed all that, 54 plate Focus: under the dash board, remove 7 torx bolts to get the glove box out, then take off the fuse box cover, lower the fuse box and wrestle that from its bracket, then two nuts to remove the fuse box bracket, then 3 hard to reach seven mm bolts, remove the pollen filter cover, then twist the pollen filter to avoid all the wiring. Reverse process to reassemble, then find the glovebox won't close, after two attempts at reassembly get the glove box closing, but the damper has fallen off, AAAAARGHHH.
If something works OK then wtf change it?
Mrcheerful