2012 Ford Focus Performance Cold Air Intake Kit Aftermarket AEM 21-702C 21-702P Installation

2012 Ford Focus Performance Cold Air Intake Kit Aftermarket AEM 21-702C 21-702P Installation


AEM 21-702C and 21-702P air intake systems
are engineered to add horsepower and reduce restriction compared to OEM air intakes, and
they come with a lifetime limited warranty. These AEM air intakes utilize a large reusable
dry-flow air filter. This oil-free filter is durable and very easy to clean. AEM 21-702C
and 21-702P air intakes fit 2012 Ford Focus models with 2.0 liter engines. See the AEM
catalog or AEMintakes.com for up-to-date model details. This air intake system is not legal
for highway use in California or other states adopting California emission standards. Check
AEMintakes.com for up-to-date information on emissions legality for specific parts on
specific vehicles. AEM power testing showed an estimated four
horsepower gain at 5,200 RPM with this air intake installed on a 2012 Ford Focus with
a 2.0 liter engine. Actual results will vary depending on the condition of the vehicle,
mileage, weather, and other variables. Here’s a comparison of the Focus sound on the Dyno
with the stock OEM system versus AEM’s air intake. AEM air intakes come with detailed
instructions with pictures and diagrams. AEM intakes are engineered for specific vehicles
to produce a safe horsepower increase. Preparing the Vehicle. Make sure the vehicle
is parked on a level surface. Set the parking brake. If the engine has run in the past two
hours, let it cool down. Disconnect the negative battery terminal. Raise the front of the vehicle
with a jack. Refer to your owner’s manual for proper jack and jack stand placement to
properly support vehicle. Support your vehicle using properly rated jack stands before wheel
removal or while working under the vehicle. Do not discard stock components after removal
of the factory system. Removal of the Stock System. Loosen the hose
clamp that secures the intake tube to the throttle body. Lift up on the red locking
clip and unplug the MAF sensor. Unplug the wire harness clip securing the harness to
the MAF sensor bracket. PCV hose number one is located at the top of the intake tube.
It has a blue colored locking mechanism. Disconnect it. PCV hose number two is located at the
top of the intake tube. It has a gray colored locking mechanism. Disconnect it. Pull the
intake tube off of the throttle body. Unfasten the rubber air inlet strap securing the air
box to the front of the vehicle. The air box is mounted to three rubber grommets. Pull
the air box up and out to dislodge the air box from the grommets. Remove the air box assembly from the vehicle.
Loosen the hose clamps securing the intake tube to the MAF sensor. Remove the intake
tube from the air box assembly. Remove the two 8-millimeter bolts that secure the MAF
sensor to the air box. Use a panel popper or flat screwdriver to remove the front cover
on the bumper. Place the tool in between the bumper and cover. Use a towel or some masking
tape on the bumper and cover to prevent scratches. Carefully pop off the cover from the bumper.
From under the car, remove the two T-25 torque screws. Remove the plastic clip closest to
the wheel. Remove the plastic clip securing the fender liner to the lower front side of
the bumper. Pull down the corner of the belly pan to gain access to the inner bumper cavity. Installation of the AEM intake system. When
installing the intake system, do not completely tighten the hose clamps or mounting hardware
until instructed to do so. Install the hump hose with a number 40 hose clamp on the throttle
body side, and a 44 hose clamp on the intake tube side. Install the upper intake tube.
Align the intake pipe and connect both PCV hoses. Tighten the number 40 hose clamp on
the throttle body side of the hump hose. Tighten the number 44 hose clamp on the hump hose
on the intake pipe side. Through the opening exposed from the bumper cover removed in step
2M, loosen the 13-millimeter nut on the chassis. Install the coupler onto the middle intake
tube and secure it with a number 40 hose clamp. Guide the middle intake tube down into the
engine bay so the end with the coupler is positioned on the lower end. Mount the intake
bracket onto the stud where the 13-millimeter nut was loosened in step 3G. Hand-tighten
the 13-millimeter nut to sandwich the intake tube bracket between the chassis and the 13-millimeter
nut. Install the 2.75 inch to 3.25 inch coupler onto the MAF sensor. Slide a number 44 hose
clamp and a number 52 hose clamp onto the coupler. Install the 2.75 inch to 2.5 inch
coupler onto the bottom side of the MAF sensor. Slide a number 44 hose clamp and a number
40 hose clamp onto the coupler. Mount and secure the bracket to the MAF sensor housing
using the provided socket head bolts and 4-millimeter washers. Tighten the socket head bolts using
a 2.5 millimeter allen wrench. Orient the MAF sensor assembly as shown and attach to
the upper and middle intake tubes. Secure the bracket attached to the MAF sensor housing
to the vehicle’s frame using the provided 10 millimeter bolt and washer. Slide a number
40 hose clamp onto the middle intake tube’s lower coupler. Attach the AEM air filter onto
the lower intake tube using a number 44 hose clamp. Pull the belly pan down to gain access
to the inner bumper cavity. Attach the lower intake tube to the middle intake tube coupler.
Orient the intake tubes and air filter and ensure the entire assembly has adequate clearance.
Reach down into the engine bay and use a box wrench to tighten the 13-millimeter chassis
nut to secure the middle intake tube. Connect the MAF extension harness to the MAF sensor
and engine wiring harness. Secure the MAF sensor extension harness with the two provided
zip ties to prevent the wire harness from moving around. Ensure all hose clamps are
tightened and secure. Reinstall the front cover and belly pan. Reassemble the Vehicle. Position the inlet
pipes for the best fitment. Be sure that the pipes or any other components do not contact
any part of the vehicle. Tighten the rubber mount, all bolts and hose clamps. Check for
proper hood clearance. Re-adjust pipes if necessary, and re-tighten them. Inspect the
engine bay for any loose tools and check that all fasteners that were moved or removed are
properly tightened. Reconnect the negative battery terminal and start the engine. Let
the vehicle idle for three minutes. Perform a final inspection before driving the vehicle.
It will be necessary to check AEM air intakes periodically for realignment, clearance, and
tightening of all connections. Failure to follow the above instructions or proper maintenance
may void warranty. Go to AEMintakes.com to find products, download installation instructions,
view dyno charts showing estimated horsepower gains, and for other product details.

About the Author: Michael Flood

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