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Toyota Corolla PCV Valve Replacement Guide
How to change the PCV valve in a 10th generation 2009, 2010, 2011, 2012 & 2013 Toyota Corolla with the 2ZR-FE.

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2010 2ZR-FE 1.8L I4
Pull Off Plastic Cover
Engine Cover Removed
This automotive "how-to" guide was specifically written to assist owners of the 10th generation (2009, 2010, 2011, 2012 and 2013) Toyota Corolla in checking or changing the PCV (positive crankcase ventilation) valve on the 2ZR-FE 1.8L I4 engine.

A few of the symptoms of a failing, faulty, clogged or stuck open PCV valve include a rough idle, misfiring, backfiring, surging, jerking, increased oil consumption, oil leaks, a CEL / SES (check engine / service engine soon) warning light, white or blue smoke from the exhaust pipe, an oily engine air filter element and reduced fuel economy (lower MPG).

There is no mention of the PCV valve in the maintenance schedule section of the Corolla owner's manual. I chose to replace the valve as part of my 100K mile service (done at 95,000 miles). If you do a lot of stop-and-go city driving, you may want to change it every 60K miles. On the other hand, if you mostly drive on the highway, you could possibly wait until 100K or 120K miles if the engine has none of the symptoms listed above.

Owners of other Toyota, Lexus or Scion vehicles such as the Yaris, Matrix, Prius, Camry, RAV4, Sienna, Tacoma, Tundra, FJ Cruiser, Venza, Highlander, Avalon, Sequoia, Land Cruiser, Allion, Premio, Auris, IS 250, ES 350, GS 350, tC, xB, xD, iQ and FR-S may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) part number for the PCV valve is Toyota 12204-37010 (also known as part # 1220437010).

I highly recommend buying the genuine Toyota part, but here are a few compatible replacement aftermarket valves with their part numbers: Mikkuppa QPV005, Standard Motor Products V512 and OES W0133-1811308-OES.

The tools required to complete this procedure include a pair of pliers, a Phillips head screwdriver, a 10mm socket with a 1/4" drive ratchet, a 12mm socket with an extension bar, a 3/8" drive ratchet, a 22mm socket and a 1/2" drive ratchet.

The first few steps are to open the hood, pull off the plastic engine cover and set the cover aside in a safe place.


Top of Engine Exposed
Clean Off With Vacuum
Colored Electrical Tape
If you have an air compressor or a wet/dry shop vacuum, clean off any sand or debris from the top of the intake manifold to help prevent from having a foreign object fall down into the engine.

To make this tutorial easier to follow, I chose to label the four rubber hoses that need to be disconnected with colored electrical tape.

There is one hose on the top of the valve cover, two hoses attached to the top of the throttle body and the fourth hose is down below on the right (driver) side of the intake manifold.

Marking Hoses With Tape
Two Coolant Hoses
Four Hoses Marked
Warning: There are two coolant hoses on the bottom of the throttle body that should NOT be removed.

Please take a look at Picture # 8 to see the location of the two coolant hoses that should be left attached to the throttle body to prevent from having coolant leak out.

I marked the two hoses with the word "COOLANT" in red letters.

If you look at Picture # 9, you'll see the four hoses that have to be removed marked with colored electrical tape.

From the top to the bottom, they are "Blue", "Red", "Yellow" and "Green". For the rest of this guide, I'll refer to these hoses by their assigned colors.

Red, Yellow, Green
Slide Back Hose Clamp
Pull Off "Blue" Hose
Pinch the two tabs on the spring clip attached to the "Blue" hose on the top of the engine's valve cover.

Slide the clamp away from the engine.

Pull the "Blue" hose off the valve cover.

Pull Off "Yellow" Hose
Pinch Hose Clamp
Slide Back Hose Clamp
Pull the "Yellow" hose off the black plastic nipple on the intake manifold near the throttle body.

Use a pair of pliers to pinch together the two tabs on the metal clamp that secures the "Red" hose to the throttle body.

Slide the hose clamp back away from the end of the hose.

Pull the "Red" hose off the throttle body.

Move to the "Green" hose located at the bottom right of the intake manifold below the throttle body.

Pinch the spring clamp to release it and slide it back away from the end of the hose.

Push Off Lower Hose
Four Hoses Disconnected
Loosen Hose Clamp
Push or pull the "Green" hose off the bottom right of the intake manifold.

Loosen the clamp that secures the air intake hose to the throttle body by turning the Phillips head screw in the counterclockwise direction.

Phillips Counterclockwise
Pull Hose Off Air Box
Hose Off Throttle Body
Loosen the clamp that secures the air intake hose to the engine air filter box by turning it in the counterclockwise direction with a Phillips head screwdriver.

Pull the air intake hose off the engine air filter housing and the throttle body.

Air Intake Hose Removed
Set Aside Air Intake Tube
Wire Harness - Bolt
Set the rubber air intake hose aside in a safe place.

Locate the wire harness that runs along the top of the intake manifold.

On my 2010 Corolla S, the fuel injector wire harness has faded green and black electrical tape on it.

Loosen Counterclockwise
Single Bolt Removed
Pry Out Plastic Pop Rivet
Loosen the single bolt on the small trapezoid shaped silver metal piece attached to the intake manifold and the top wire harness.

Turn the bolt in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet.

Set the bolt aside in a safe place.

Use a pop rivet removal tool to pull the plastic fastener on the left side of the harness out of the intake manifold.

You might also be able to use a flat head screwdriver or a pair of needle nose pliers to pull out the pop rivet.

Plastic Fastener Removed
Lower Wire Harness
Lower Harness Fasteners
Locate the wire harness situated at the bottom of the intake manifold.
Pry Out Pop Rivet
Lower Left Detached
Lower Right Pop Rivet
Pry out the pop rivet at the bottom left and the pop rivet at the bottom right of the intake manifold.

Make sure that the lower wire loom is separated from the intake manifold.

Lower Right Detached
Yellow / Green Tape
6 Fasteners - Labeled
The black plastic intake manifold assembly is secured to the engine by six fasteners.

There are four bolts and two nuts.

I marked the bolts and nuts with the green / yellow electrical tape to make it easier for you to see them.

The fasteners are numbered in the pictures with # 1 being on the far left (passenger) side and # 5 on the far right (driver) side.

The # 6 fastener is the bolt situated on the bottom right (driver) side of the intake manifold.

Bolts # 2, 3, 4
Bolts # 4 & 5
Lower Right - Bolt # 6
Lower PCV Hose
Loosen Counterclockwise
Magnet Catch Bolts Nuts
Loosen the five fasteners along the top of the intake manifold with the 12mm socket and a 3/8" drive ratchet.

If you have a magnetic pick-up tool, hold it below the two nuts as you remove them so that they don't fall down and become lost in the engine bay.

I just attached a magnet to the end of a piece of wire hanger with some tape.

Bolt # 1 Removed
# 2 - Remove Nut
Magnet - Catch Nut
Remove the # 1 bolt, the # 2 nut, the # 3 bolt, the # 4 nut and the # 5 nut on the top of the intake manifold.

Set the fasteners aside in a safe place.

Loosen Bolt # 3
# 3 Bolt Removed
Loosen # 4 Nut
# 4 Nut Removed
Remove # 5 Bolt
# 5 Bolt Removed
Loosen # 6 Bolt
# 6 Bolt Removed
Fasteners Labeled
Remove the # 6 bolt situated at the bottom right (driver) side of the intake manifold by turning it in the counterclockwise direction with the 12mm socket and a 3/8" drive ratchet.

As a precautionary measure, I kept the various fasteners organized by number on a piece of paper.

The 12mm intake manifold bolts all seemed to be the same, but I didn't want to mix them up.

# 6 Lower Bolt Location
Pull Off Metal Plate
Metal Bracket Removed
Pull the silver metal bracket off the top of the intake manifold.

Set the bracket aside in a safe place.

Move Aside Hoses
Pull Off Intake Manifold
Intake Manifold Removed
Carefully pull the intake manifold off the engine.

Avoid using excessive force. The intake manifold should come off relatively easily.

Gently rotate the intake manifold towards the right (driver) side of the engine bay.

Rest the manifold on the 12V automotive battery.

Red / Orange Gasket
Old PCV Valve Exposed
PCV Valve Housing
Inspect the red / orange colored rubber gasket on the intake manifold.

If the gasket appears torn, dry rotted or damaged in any way, it should be replaced with a new one.

The OEM part number for the intake manifold gasket is Toyota 17177-0T020 (or 171770T020).

Locate the PCV valve housing situated just below the # 3 intake.

Pinch Clamp - Slide Back
Pull Off Rubber Hose
PCV Hose Removed
Squeeze the two tabs on the hose clamp and slide it back away from the PCV valve.

Pull the rubber hose off the old PCV valve.

Set the hose aside in a safe place.

New Craftsman Socket
Socket & 1/2" Ratchet
Loosen Counterclockwise
To remove the old valve, you'll need a 22mm socket with a 1/2" drive ratchet.

I bought a Craftsman 22mm deep well impact socket but you may be able to use a standard shallow 22mm socket.

Loosen the old valve by turning it in the counterclockwise direction.

Spin Out Old Valve
Old Valve Removed
New OEM Toyota PCV
Spin out the old bolt the rest of the way by hand.

You'll notice that both the old and new valves have threadlocker adhesive on the threads.

The OEM part number for the PCV valve is Toyota 12204-37010.

New Vs. Old Valve
Torque Wrench
Socket & Torque Wrench
If you have a torque wrench, the PCV valve should be tightened to the service manual specification of 20Nm which is equivalent to about 14.75 lb-ft of torque.
Spin In New PCV Valve
Tighten New Valve
Easy Access Alternator
Spin in the new PCV valve a few turns by hand in the clockwise direction to make sure it doesn't become cross threaded.

Tighten the new valve by turning it in the clockwise direction with the 22mm socket and a 1/2" drive ratchet.

The new valve might be difficult to turn at first due to the dried thread locking adhesive fluid on the threads.

Continue tightening the new valve to the service manual specification of 20 Newton-meters or 14.75 lb-ft of torque.

Try to avoid over tightening the valve to prevent from damaging the threads or cracking the aluminum housing.

(If your car needs a new alternator, now would be a good time to replace it. There is plenty of working room around the alternator with the intake manifold removed.)

(If your car needs a new knock sensor, the knock sensor is located just to the left of the PCV valve housing and below the # 2 intake.)

PCV Valve Hose
Push Hose Over PCV
Replace Intake Manifold
Push the rubber hose back over the nipple on the end of the new PCV valve.

Route the other side of the hose (with the green tape) towards the right side of the engine.

Slide the clamp back into place over the hose and the PCV valve's nipple.

Make sure the hose is securely in place.

Wipe off any debris from the intake manifold gasket.

Carefully lower the intake manifold back into place over the front of the engine.

Line Up "Green" Hose
Insert Bolt # 6
Silver Metal Bracket
Make sure the hose from the PCV valve (marked with green tape) is in the correct position at the bottom right corner of the intake manifold.

Spin in the # 6 bolt at the bottom right of the intake manifold.

Lower In Metal Bracket
Replace Bolt - # 1
Replace Nut - # 2
Lower the silver metal bracket down over the top of the intake manifold.

Replace the fasteners.

Replace Bolt - # 3
Replace Nut - # 4
Replace Bolt - # 5
Spin in the bolt # 1, nut # 2, bolt # 3, nut # 4 and bolt # 5 along the top of the intake manifold.

Do not fully tighten any of the fasteners until they are all in place.

Once all 6 fasteners are attached, tighten them to the service manual specification of 28 Nm or about 20.65 lb-ft of torque.

Double check that all of the bolts and nuts are tight before moving on to the next steps.

Tighten Bolt - # 6
Line Up "Green" Hose
Lower Hose Secured
Tighten the bolt # 6 at the bottom right of the intake manifold.

Push the "Green" hose on to the bottom of the intake manifold near bolt # 6.

Secure the spring clip clamp over the end of the "Green" hose.

Push On "Yellow" Hose
Push On "Red" Hose
Secure Hose Clamp
Push the "Yellow" hose back over the black plastic nipple on the top right of the intake manifold near the throttle body.

Push the "Red" hose on to the throttle body.

Secure the metal hose clamp over the end of the "Red" hose.

Line Up Air Intake Hose
Push Hose On Air Box
Hose On Throttle Body
Line up the air intake hose with the smaller "Blue" hose near the top of the engine.

Push the rubber hose on to the engine air filter box and the throttle body.

Tighten Clamp Clockwise
Tighten Hose Clamp
Push On "Blue" Hose
Tighten the two hose clamps on the air intake hose by turning the screws in the clockwise direction with a Phillips head screwdriver.

Push the "Blue" hose on to the metal nipple on the top of the valve cover.

Wire Loom Bracket Bolt
Tighten Bolt Clockwise
Push In Pop Rivets
Re-attach the trapezoid shaped metal bracket for the fuel injector wire harness by tightening the 10mm bolt in the clockwise direction until it is snug.

Push in the pop rivets for the lower wire harness into their mounting holes.

Wire Loom Secured
Secure Top Wire Harness
Done Re-Assembling
Push the pop rivet for the upper wire harness into the mounting hole on the top left of the intake manifold.

Double check that the wire harnesses, fasteners and hoses are all properly installed.

Removed Color Tape
Push On Plastic Cover
Engine Cover Secured
Lower the plastic cover back into place and push on it to secure the four rubber friction fasteners to the metal pegs on the top of the engine.

Start the engine and listen closely for any strange sounds. If you do hear any strange noises, immediately turn off the engine and double check your work. Be sure to inspect the rubber hoses for any splits, tears, cracks or other damage.

Don't forget to write down the procedure in your vehicle's service records.

For more, check out my other Corolla DIY tutorials at the links below -

2009-2013 Toyota Corolla Repair & Maintenance Guides

2014-2018 Toyota Corolla Repair & Maintenance Guides

2003-2008 Toyota Corolla Repair & Maintenance Guides

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