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2000-2007 Toyota Corolla Spark Plugs Replacement

Changing spark plugs is a small but essential...

iFixit Library 2000-2007 Toyota Corolla Moderate 30 minutes - 1 hour Guide 185208

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Guide overview

Before you begin

Changing spark plugs is a small but essential part of vehicle maintenance that can make a big difference in how your engine performs. Spark plugs are responsible for igniting the air-fuel mixture in your engine's cylinders, which is what keeps your car running smoothly. Over time, they can become worn, dirty, or corroded, leading to reduced fuel efficiency, rough idling, hard starts, or even engine misfires. Replacing them at the recommended intervals helps maintain optimal engine performance, improves gas mileage, reduces emissions, and ensures a more reliable driving experience. Simply put, keeping your spark plugs fresh is key to keeping your engine healthy. If it's time to replace the spark plugs of your 2000-2007 Toyota Corolla, follow this guide. Before you begin this repair, make sure your car is turned off, and the engine has cooled if you have driven it recently. We will also disconnect the battery using the guide, just as a safety precaution to reduce the risk of a short or unintended spark, which could cause a fire.

Step 1

Repair step

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Open the driver's side door. On the bottom left of the steering column, there will be a small hood release latch.
Place two fingers under the lip of the release, and pull upwards to release the hood.
An audible click will be heard.

Step 2

Repair step

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Go to the front of your vehicle and locate the hood latch under the hood and off right from the center.
Push up on the latch to unlock the hood.

Step 3

Repair step

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Raise the hood prop.
Insert the prop rod into the hole.

Step 4

Repair step

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Locate the negative battery terminal (negative is black, while positive is red).
Use a socket to loosen the bolt on the negative terminal clamp.
Remove the negative terminal clamp from the battery.
Move the clamp aside so it does not touch the battery terminal or any other metal in the vehicle.

Step 5

Repair step

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Use a 10mm socket to remove the two 10mm nuts near the center of the cover.
Pull up the cover and set it aside with the 10mm nuts.

Step 6

Repair step

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Use a 10 mm socket to loosen the bolt on all four ignition coils.

Step 7

Repair step

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Press the tabs on the connectors to disconnect them from each coil.
Remove the ignition coil.

Step 8

Repair step

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Place the spark plug socket onto the spark plug.
Turn the ratchet counterclockwise to loosen the spark plug.
Take out the spark plug. Repeat for all four spark plugs.

Step 9

Repair step

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Lower the new spark plug into the hole. Turn the extension clockwise by hand first until it becomes tight.
Attach the ratchet and tighten the spark plug a little more. Repeat for each cylinder.

Step 10

Repair step

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Reinstall each ignition coil by pressing down to seat the coils correctly.
Reinstall the four 10mm bolts. Tighten by hand, then use the ratchet for an extra 1/4 turn.

Step 11

Repair step

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Reattach the connectors to each ignition coil. Listen for a subtle click. Confirm the electrical connector is secure.
Repeat for all four ignition coils.

Step 12

Repair step

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Align the holes with the studs and oil fill port.
Place two 10mm nuts.
Tighten by hand, then 1/4 turn with ratchet.

Step 13

Repair step

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Relocate the negative battery terminal.
Place the terminal clamp over the battery post.
Tighten the bolt with the ratchet until it is snug.
Make sure the cable does not move.
A loose battery terminal can cause a vehicle to not start, so it's best to ensure terminals are tight.

Step 14

Repair step

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Lift the hood. Put the hood prop back into its downward position.
Secure the prop in the plastic holder. Remove all tools and old parts from the engine bay.
Lower the hood. Press down on the hood to lock it.
Check to make sure there is no gap between the hood and grill. Repeat pressing down until the hood is locked and cannot be lifted.