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Ford Focus Engine Air Filter Replacement Guide
How to clean or change the engine air filter of a 3rd generation 2011-2014 MK3 Ford Focus with the 2.0L motor.

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Engine Air Box
Air Box Screws
Remove With Socket
This automotive tutorial was specifically written to assist owners of the third generation MK III (2011, 2012, 2013 & 2014) Ford Focus sedan or hatchback equipped with the 2.0 liter Duratec 20 Ti-VCT GDI inline four cylinder motor in cleaning or changing the engine air filter element.

Owners of other Ford vehicles with the Duratec 20 engine such as the Transit Connect, Fiesta, C-Max, Mondeo, EcoSport, S-Max, and Galaxy may also find these DIY instructions to be helpful.

A few compatible replacement air filter elements with their part numbers are as follows: AEM AE-20993, Wix # 49017, Hastings AF1479, Mahle LX 1780, Ecogard XA6149, Fram CA11114, Purolator A36149 and Champion CAC11114.

The tools needed needed to open the air box and access the filter include an 8mm socket and a 1/4" drive ratchet.

8mm Screw Removed
Loosen 2nd Screw
Four 8mm Screws Total
The air box is located at the front right (driver) side of the engine bay just behind the headlight assembly and next to the electrical fuse panel.

Remove the four screws that hold the air filter cover in place by turning them counter clockwise with an 8mm socket and ratcheting wrench.

There is one screw at each corner of the cover.

The screws may come out entirely or some may remain stuck in the top half of the air box.

Set any screws that you removed aside in a safe place.

Screw May Stay In Cover
Lift Off Air Box Cover
Pull Out Old Air Filter
Lift the cover straight off the air box and set it aside in a safe place.

Pull the old air filter element straight out of the air box and inspect it.


Inspect Old Filter
Clean Lower Half Air Box
Clean Filter With Vacuum
If the old filter is relatively clean, just tap out the large debris and remove any fine dust with a wet/dry shop vacuum.

If the old filter is dark grey or black and clogged with dirt, dust, hair, insects, leaves and twigs, it should be replaced with a brand new unit.

I recommend buying either the  AEM AE-20993 or the Wix # 49017 engine air filters since they have excellent reviews on Amazon.

It's also a good idea to vacuum out any debris or sand at the bottom of the air box.

Install New or Cleaned Filter
Line Up Top Half Air Box
Insert 8mm Screws
Insert the cleaned or new air filter element in to the lower half of the box with the opening facing to the left towards the intake hose and the engine.

Line up the top half of the air box and push it down in to place.

Push Down Filter Cover
Insert Other Screws
Tighten With 8mm Socket
Insert the four screws and tighten them with the 8mm socket and ratcheting wrench by turning them clockwise.

For more, check out my other Ford Focus Repair & Maintenance Guides.

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