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-Ford Fiesta Zetec JA8 1.25 duratec 16v petrol 08-13

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Misc:
-This filter should be replaced every 37K miles or 3 years

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-Locate the air filter housing in the engine bay
-Take out the 4 T30 screws that hold the housing cover on (Replace the screws with stainless if they have deteriorated)
-Lift the housing cover up and to the left to gain access 

-Remove the air filter
-Remove the small PCV filter sponge in the bottom left hand side of the airbox 
-Wipe any dirt or oil residue from inside the airbox 
-Replace the PCV filter sponge
-Replace the air filter

-Put the airbox cover back in place
-Fasten the 4 T30 screws until they are reasonably tight

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Useful sources:

How to Replace the air filter on the  Ford Fiesta 2008 to 2012

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2 hours ago, CursedBones said:

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-Locate the air filter housing in the engine bay

-Take the X 4 T30 screws that hold the housing cover on (Replace the screws with stainless if they are badly corroded)

-Lift the housing cover up and to the left to gain access
 

-Remove the air filter

-Remove the small PCV filter sponge in the bottom left hand side of the airbox

-Wipe any dirt or oil residue from inside the airbox

-Replace the PCV filter sponge

-Replace the air filter

-Put the airbox cover back in place

-Fasten the X 4 T30 screws

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thanx a lot for that @CursedBones can you tell me the exact screws that go in the airbox top please as yes...my heads are corroded on them..mk7 zetec s 1.6 ti vct

im not sure how long or what width i need., also the screws i have dont fully come out of the airbox lid..is that right

20 hours ago, OvEr_KiLL said:

 

thanx a lot for that @CursedBones can you tell me the exact screws that go in the airbox top please as yes...my heads are corroded on them..mk7 zetec s 1.6 ti vct

im not sure how long or what width i need., also the screws i have dont fully come out of the airbox lid..is that right

Hi mate!

The existing screws are captive so it's correct that you cannot remove them. I cannot remember exactly how I removed them but it was either by cutting them with an angle grinder or using small bolt cutters. 

To be honest with you I cannot remember exactly what size the screws need to be.
What I would do is unfasten the box and cut one of them so that you can remove it. Put the airbox back on and take the cut bolt to a hardware store. Ask them for 4 appropriate stainless screws.

I would probably go self tapping and probably go the next size up. I wouldn't be too concerned with them being threaded all of the way as mine 100% were. Just get a similar length screw, I wouldn't go longer though.

Admittedly I have only removed mine once to check the air filter but everything seemed totally fine. No splitting in the plastic or anything etc. Hope that helps.