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Toyota RAV4 Spark Plugs Replacement Guide
How to check or change the spark plugs in a 2019 to 2023 Toyota RAV4 with the A25A-FKS 2.5L I4 engine.

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2019 RAV4 2.5L I4
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Pull Off Engine Cover
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Engine Cover Removed
This automotive maintenance tutorial was specifically written to assist owners of the fifth generation (2019, 2020, 2021, 2022 and the updated 2023 model year) Toyota RAV4 SUV in checking or changing the spark plugs in the A25A-FKS 2.5 liter inline four cylinder engine.

Owners of other Toyota and Lexus vehicles such as the Camry, Corolla, Highlander, Prius, Avalon, C-HR, GR86, Venza, Sienna, Sequoia, 4Runner, IS 250, IS 300, IS 350, ES 350, GS 350 and GX 460 may also find these DIY instructions to be helpful.

The original OEM spark plugs in this 2019 RAV4 were the Denso FC16HR-Q8.

The tools needed to complete this procedure include an 8mm socket with a 1/4" drive ratchet, a 14mm spark plug socket (or a 9/16"), an extension bar, a 3/8" drive ratchet and a tube of dielectric grease.

The first few steps are to open the hood and then gently pull off the foam rubber cover from the top of the engine.

Set the engine cover aside in a safe place.

Clean off the top of the engine with a wet/dry shop vacuum or compressed air to help prevent from having debris fall down into the spark plug well.



 

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Top of A25A-FKS
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Ignition Coil
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Push In Release Tab
I recommend only checking or changing one spark plug at a time to help further reduce the risk of having debris fall down into the cylinder.

Push in the release tab on the electrical connector before sliding it straight out of the ignition coil housing.

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Disconnect Power Plug
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Loosen Counterclockwise
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Black Bolt Removed
Loosen the single bolt that secures the ignition coil to the top of the engine by turning it in the counterclockwise direction with an 8mm socket and a 1/4" drive ratchet.

Set the ignition coil bolt aside in a safe place.

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Lift Out Ignition Coil
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Ignition Coil Removed
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Toyota 90919-A2009
Rotate the ignition coil back and forth a few times to make sure the rubber dust boot is not stuck or "frozen" to the top of the old spark plug.

Pull the ignition coil straight out of the spark plug well.

(If you need to replace a faulty ignition coil, the part number is Toyota 90919-A2009. If you have an OBDII / OBD2 code scanner, you may see DTC (diagnostic trouble code) P0354 which indicates a problem with the coils.)

Set the ignition coil aside in a safe place.

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14mm Spark Plug Socket
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Loosen Counterclockwise
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Lift Out Old Spark Plug
Attach the 14mm spark plug socket to an extension bar and the 3/8" drive ratchet.

(You could also use a 9/16" spark plug socket.)

Lower the socket into the well and push it securely over the old spark plug.

Carefully loosen the old spark plug by turning it in the counterclockwise direction.

Once the old spark plug is loose, detach the ratchet from the extension bar.

Spin out the old spark plug the rest of the way by hand.

Lift the extension bar and socket out of the well.

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Spark Plug Removed
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Spin In New Spark Plug
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Tighten Clockwise

Detach the old spark plug from the socket.

The RAV4 service manual specifies that the OEM iridium tipped spark plugs should last up to 120,000 miles.

The original spark plugs in this 2019 RAV4 were part number Denso FC16HR-Q8.

According to the owner's manual, the new spark plugs should be gapped to 0.031" (inches) or 0.8 mm.

Push the new spark plug into the socket.

Your socket should have a rubber insert or a strong magnet to securely hold the spark plug in place.

Gently lower the new spark plug down into the well.

Spin in the new spark plug a few turns by hand in the clockwise direction to help prevent from having it become cross threaded.

Tighten the new spark plugs to about 1/4 turn past finger tight. They should be snug but do NOT over tighten them.

If you insist on using a torque wrench to tighten the spark plugs, the service manual specification for most Toyota vehicles is 13 lb-ft.

Some spark plug manufacturers specify 18 lb-ft of torque.

Double check that the spark plugs are tight before moving on to the next steps.

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Apply Dielectric Grease
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Lower In Ignition Coil
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Line Up Bolt Holes

Apply a small amount of dielectric grease to the opening in the rubber dust boot at the bottom of the ignition coil.

The dielectric grease will help keep out any debris or moisture to ensure a reliable electrical connection.

Lower the ignition coil down into the spark plug well.

Push on the ignition coil until you feel the rubber dust boot securely attach to the top of the new spark plug.

Rotate the ignition coil back and forth a few times to make sure the dielectric grease is evenly spread out.

Line up the bolt hole in the ignition coil with the corresponding hole in the top of the engine.

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Spin In Ignition Coil Bolt
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Tighten Bolt Clockwise
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Push On Power Plug

Spin in the bolt a few turns by hand in the clockwise direction to help prevent from having it become cross threaded.

Continue tightening the bolt with the 8mm socket and a 1/4" drive ratchet until it is snug.

Try to avoid over tightening the bolt to prevent from cracking the plastic ignition coil housing.

Push the electrical connector straight into its socket on the ignition coil.

You should feel or hear the power plug "click" securely into place.

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Spark Plugs Replaced
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Push On Engine Cover
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Test New Spark Plugs

Push the foam rubber engine cover back down into place.

Start the engine and listen closely for any strange sounds which might indicate a loose spark plug or a disconnected power plug.

If you hear a weird noise, immediately turn off the ignition and double check your work.

Be sure to record the spark plug change in your vehicle's service records.

For more, please check out all of my 2019-2023 Toyota RAV4 DIY Repair & Maintenance Guides.
 

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