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Toyota Prius Engine Air Filter Replacement Guide
How to clean or replace the engine air filter element in a 3rd generation 2010-2015 Toyota Prius with the 1.8L I4motor.

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Prius 1.8L Engine Air Box
Release Right Metal Latch
Release Left Side Latch
This automotive "how-to" guide was specifically written to assist owners of the third generation (2010, 2011, 2012, 2013, 2014 & 2015) Toyota Prius hybrid hatchback in cleaning or replacing the 1.8L engine's air filter element.

Owners of the previous 2nd generation 2004-2009 Prius and other Toyota, Lexus or Scion vehicles such as the Yaris, Corolla, Matrix, Camry, Sienna, Avalon, Highlander, RAV4, FJ Cruiser, Venza, 4Runner, Sequoia, Tacoma, Tundra, IS250, ES350, tC, FR-S, iQ, xD, and xB may also find these DIY instructions to be helpful.

A few compatible aftermarket engine air filters with their part numbers are as follows: Purolator A26114, Fram CA10741, Wix 49320, Pentius PAB10741, MAHLE LX 2870, Ecogard XA6114, K&N 33-2435 and the OEM Toyota 17801-37021.

No tools are needed to access the engine air filter.

A wet/dry shop vacuum can be useful for cleaning the air box or element.

Lift Off Top Half
OEM Engine Air Filter
Lift Out Old Air Filter
First open the hood of the vehicle to expose the engine bay. Then move to the center of the vehicle and locate the square black plastic engine air box.

The top half of the air box is held in place by two metal latches with one on the left side and the other on the right side.

Release the latches by flipping them outwards away from the air box.

Pinch the rubber edge of the air filter and lift it out of the bottom half of the air box.

Inspect Underside
Install New/Cleaned Filter
Insert Tabs Into Slots


Look at the underside of the old air filter element. If the old filter is dark grey or black and clogged with dirt, dust, leaves, insect and other debris, it should be replaced.

I recommend buying the Fram CA10741 since it has excellent reviews on Amazon.

If the old filter is relatively clean, just tap out the large debris and vacuum it with the wet/dry shop vac before re-installing it into the bottom half of the air box.

Be sure to install the new or cleaned engine air filter with the pleats facing down.

Close 1st Metal Clasp
Secure 2nd Metal Clasp
Engine Air Filter Replaced
To re-attach the top half of the air box, first insert the tabs at the rear into the slots on the bottom half closest to the engine cover.

Then swing the top half of the air box closed, raise the metal latches up, and snap them in place to secure the two halves.

For more, check out my other Toyota Prius DIY Repair & Maintenance Guides.

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