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Mitsubishi Outlander PCV Valve Replacement Guide
How to check or change the PCV (positive crankcase ventilation) valve in a 2014 to 2021 Mitsubishi Outlander.

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2020 Outlander 2.4L I4
Plastic Engine Cover
Loosen Counterclockwise
This automotive maintenance tutorial was specifically written to assist owners of the third generation (2014, 2015, 2016, 2017, 2018, 2019, 2020 & 2021) Mitsubishi Outlander SUV in checking, cleaning or changing the PCV (positive crankcase ventilation) valve located in the valve cover of the MIVEC 2.4 liter naturally aspirated inline four cylinder engine. (The procedure should be the same or very similar for models equipped with the 2.0L I4 engine or the 3.0L V6 engine.)

Owners of other Mitsubishi vehicles such as the Outlander Sport, Eclipse Cross, Mirage, Mirage G4, Lancer, ASX, Montero Sport, Pajero, Xpander, Strada and RVR may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) PCV valve part number is Mitsubishi 1035A422.

The tools needed to complete this procedure include a 10mm socket with a 1/4" drive ratchet, a pair of needle nose pliers and a 23mm deep well socket (or a 24mm socket would also work).

If you'd like to clean the old PCV valve and reinstall it, use carb cleaner or something similar such as throttle body cleaner, brake parts cleaner spray or engine degreaser.

Just a few of the possible symptoms of a clogged or failing PCV valve include misfires, rough acceleration, surging, a rough idle, a CEL / SES (check engine light or service engine soon light), oil leaks, oil consumption (burning oil) and blue, white or black smoke coming from the exhaust system. If you have an OBDII scanner, a few related DTC (diagnostic trouble codes) include P053A, P0300, P0171, P0174 and P052E.

The first steps are to open the hood and locate the two black metal bolts on the top of the plastic engine cover.

Loosen the bolts by turning them in the counterclockwise direction with a 10mm socket and a 1/4" drive ratchet. (You could also use a Phillips head screwdriver).


Remove Right Side Bolt
Left Side Black Bolt
Pull Out Right Side Bolt
You may need to use needle nose pliers to lift the black metal bolts out of the plastic engine cover.

Set the two bolts aside in a safe place.

Lift Up Front of Cover
Plastic Cover Removed
Engine Valve Cover
The plastic engine cover is still held in place by a plastic peg attached to a rubber socket.

Gently lift up the front edge of the engine cover to release the friction fastener.

Set the engine cover aside in a safe place.

Locate Rubber Hose
Pull Hose Off PCV Valve
Rubber Hose Detached
Locate the black rubber hose in between the first and second spark plug ignition coils.

Carefully pull the rubber hose straight off the old PCV valve.

A few drops of oil might leak out of the hose or weep out of the old valve.

Loosen Counterclockwise
Spin Out Old Valve
Old Valve Removed
Loosen the old valve by turning it in the counterclockwise direction with a deep well 23mm socket.

A 24mm deep well socket is close enough in size that it would also work. You could also use an adjustable crescent wrench or some pliers.

Once the old valve is loose, spin it out the rest of the way by hand.

Empty Port In Engine
Shake - Rattle Sound
Spin In New PCV Valve
To check the condition of the old valve, shake it vigorously.

If you hear a "healthy" sounding rattling noise, the old valve is most likely still in good working condition.

If you'd like to try cleaning and reusing the old valve, thoroughly spray it inside and out with carburetor cleaner.

You could also use brake parts cleaning spray, throttle body cleaner or engine degreaser.

Allow the PCV valve to fully dry before reinstalling it.

If the old valve seems damaged or clogged, replace it with a new OEM Mitsubishi 1035A422 PCV valve.

(The old valve also had the part number CMFS 9Y07 printed on it.)

This is especially important if your vehicle has over 60,000 miles. PCV valves can sometimes last over 100,000 miles, but they are inexpensive enough that they should be replaced early as preventative maintenance.

Spin in the new PCV valve in the clockwise direction by hand with just your fingers.

Do NOT use a ratchet or a wrench to tighten the plastic PCV valve since it can easily be over tightened and cracked.

Torque Specification
Gently Tighten New Valve
Push On Rubber Hose
The torque specification for tightening the PCV valve is printed on the plastic valve cover and it is a range of just 1.96~2.94 N*m (or 1.44 lb-ft to 2.16 lb-ft).

Use the 23mm socket by itself to slightly tighten the new PCV valve until it is just barely snug.

Try to avoid over tightening the new valve!

Push the rubber hose over the nipple on the new PCV valve until it is fully seated in place.

Push On Engine Cover
Secure Friction Fastener
Replace Left Bolt
Lower the engine cover back down into place.

Push on the front edge of the the cover to secure the plastic peg to the rubber socket.

Spin in the two bolts a few turns by hand in the clockwise direction to help prevent them from becoming cross threaded.

Tighten Right Side Bolt
Plastic Cover Secured
PCV Valve Change Done
Tighten the two bolts in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until they are snug.

Try to avoid over tightening the bolts to prevent from cracking the plastic engine cover.

Be sure to write down the PCV valve change in your vehicle's service records.

Please check out all of the 2014-2021 Mitsubishi Outlander DIY Repair & Maintenance Guides.

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