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2005-2012 Toyota Yaris Spark Plug Replacement

Spark plugs often need to be replaced every...

iFixit Library 2005–2010 Toyota Yaris Moderate 40 minutes - 1 hour Guide 167047

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Guide overview

Before you begin

Spark plugs often need to be replaced every 30,000 miles while some can last for longer. Over time, they become worn out, preventing your vehicle from starting properly. Use this guide to replace the spark plugs of your Toyota Yaris 2005-2012 vehicle. Doing this replacement on your own will save you the cost of a tune-up. For safety reasons, it is advised that you ensure the hood of the car is properly secured, your battery is disconnected, and the car is cooled down before replacing your vehicle's spark plugs. Additionally, properly handle each tool and component during this activity. Place your car in park, engage the parking brake, and power off the ignition before you begin.

Step 1

Repair step

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Remove the four bolts from the engine cover using a 10 mm socket wrench.
Additionally, you can use the wrench to loosen the bolts and then swap for your hands or a spinner handle to completely unscrew them.

Step 2

Repair step

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Lift the cap off and set it to the side.
You will see four ignition coils. For this tutorial, we will only replace one of the sockets.

Step 3

Repair step

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Remove the ignition coil connector by pushing down on the end of the clip and unplugging it.
Unscrew the bolt on the other end of the socket plug using the 10 mm socket wrench.

Step 4

Repair step

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Remove the ignition coil to reveal the spark plug cavity.

Step 5

Repair step

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Remove the adapter and 10mm socket from the socket wrench and replace it with the 6" extension adapter and spark plug socket

Step 6

Repair step

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Too much force can cause your spark plug to crack. Unscrew it carefully to ensure no debris falls into the hole.
Insert a 6" extension adapter and spark plug socket wrench into the cavity where your spark plug is located. Make sure it reaches and securely grabs onto the spark plug.
Remove the spark plug by pulling the socket wrench towards you, and loosen it until it unscrews completely.
To be safer, start by using the wrench to loosen it, then remove the wrench handle and unscrew it the rest of the way with your hands.
Lift the wrench and the spark plug out of the cavity.

Step 7

Repair step

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After you remove the old spark plug, take out your new spark plug and remove its plastic protector.

Step 8

Repair step

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Once you remove the white protector, take out the spark plug boot protector and open it to spread its lubricant across the screw area of the new spark plug.
Anti-Seize Lubricant is used to allow for easy spark plug removal in the future.

Step 9

Repair step

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Make sure you tighten enough to minimize the risk of the spark plug being removed from the engine.
Fit your new spark plug into the socket, and insert it into the cavity.
Tighten the spark plug by pushing the wrench away from you, doing so until it's completely screwed in.
To avoid damaging the spark plug while tightening it, start by screwing in the plug with your hands, then add the wrench handle and tighten until it's secure.

Step 10

Repair step

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Insert the ignition coil back into the cavity, plug in the connector, and screw in the bolt to secure it.
If your ignition coil connector's tab broke like this one did, you can use zip-ties to secure it or replace it. (Part #: 90980-11885)

Step 11

Repair step

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If more than one spark plug is damaged, repeat steps 5-11 for the rest of them.