What tool do I need to change spark plugs on a Toyota?

You’ll typically need a spark plug socket with a 5/8 inch hex, a ratchet, extensions, and a torque wrench, plus the correct replacement plugs for your Toyota engine. Exact sizes and torque vary by model, so consult your owner’s manual or service data for specifics.

Spark plug access in Toyotas varies by engine layout. Some models hide the plugs behind coil packs or under intake components, while others expose them more easily. This guide lays out a general toolkit and steps that apply to most modern Toyota inline-4 and V6 engines, with notes on model-specific nuances.

Tools you'll need

Gather these core tools to cover most Toyota engines that use coil-on-plug ignition or plug wires.

• Spark plug socket with a magnetic or rubber insert (typically 5/8 inch hex)


• Ratchet (3/8 inch drive is standard) and appropriate extensions (6–12 inches)


• Universal joint or wobble extension for tight angles


• Torque wrench capable of measuring roughly 10–25 ft-lbs (about 13–34 N·m)


• Replacement spark plugs of the correct type and heat range for your engine (OEM-recommended brands such as NGK or Denso)


• Dielectric grease for ignition coil boots


• Anti-seize compound (only if specified by Toyota service data; many newer engines do not require it)


• Clean rags or a small brush to wipe debris from around plug wells


• Optional: spark plug gap gauge (many plugs come pre-gapped)


• Basic tools to remove engine covers or air intake as needed (screwdrivers, trim tools)


• Flashlight or headlamp for visibility

With these tools, you’ll be prepared to tackle spark plug changes on most Toyota engines. Always verify the exact plug type and torque specification for your specific model to avoid over-tightening or misfit parts.

Model-specific considerations

Coil-on-plug access and common layouts

Most modern Toyota engines use coil-on-plug ignition, so you’ll typically remove the coil or coil pack to access each spark plug. Some engines may require removing a plastic cover, an intake duct, or a small air intake assembly to reach the plugs. Have a variety of screwdrivers and trim tools handy to navigate covers and clips without damage.

Torque specs and plug types

Torque specifications and plug types vary by engine. While many Toyota engines use relatively light torque (roughly 12–22 ft-lbs or 16–30 N·m), always confirm the exact specification for your model in the owner's manual or service data. Iridium or platinum plugs are common on newer Toyotas and may come pre-gapped; if you gap them, do so carefully according to the manufacturer’s guidelines. If the service manual calls for anti-seize on the threads, follow that instruction; otherwise, many modern engines only require a clean, dry thread or a light coating of engine oil on the threads.

How to change spark plugs on a Toyota

Use these steps as a general workflow. Some steps may vary slightly depending on your specific engine and layout.

1. Park on a level surface, engine cool, and disconnect the negative battery cable for safety.


2. Remove any engine cover or air intake components necessary to gain access to the spark plug wells.


3. Identify the coil packs or ignition coils. For coil-on-plug systems, disconnect the electrical connector and unbolt or unclip the coil to expose the spark plug.


4. Clean around the plug wells to prevent debris from falling into the cylinder head. Use a brush or compressed air if available.


5. Carefully loosen and remove the old spark plug with the spark plug socket. If needed, use a magnet to help extract the plug; avoid wiggling or forcing the plug if it’s stubborn.


6. Inspect the old plug for signs of wear or damage and compare with the new plug. If you’re using a gap-gap plug, verify the gap, but many plugs come pre-gapped from the factory.


7. Install the new spark plug by hand to avoid cross-threading, then tighten to the manufacturer’s specified torque with a torque wrench. Do not over-tighten.


8. Reinstall the coil pack(s) or ignition components, reconnect electrical connections, and reassemble any removed covers or intake parts.


9. Reconnect the battery, start the engine, and listen for smooth operation. Check for misfires or abnormal sounds; if something seems off, recheck torque and connections.

Following these steps carefully will help ensure proper seating, sealing, and ignition performance. If you’re unsure about the exact torque value or plug type for your specific Toyota model, consult the official service manual or a qualified technician.

Safety and maintenance tips

Always prioritize safety and precision. Work with a cool engine, use appropriate hand protection, and keep track of removed parts to prevent misplacement. Double-check all electrical connectors after reassembly, and if you’re performing maintenance beyond plug replacement (such as coil pack replacement), consider replacing any worn hoses or clamps encountered along the way.

Summary

Changing spark plugs on a Toyota hinges on having the right tools, understanding your engine’s access path, and applying the correct torque to the replacement plugs. Start with a 5/8 inch spark plug socket, a ratchet, extensions, and a torque wrench, plus the right plugs for your engine. Be prepared for coil-on-plug access or intake cover removal, and always confirm model-specific torque specs and plug type in the official manuals. With careful preparation and methodical steps, you’ll restore reliable ignition performance and engine efficiency.

What socket to remove spark plugs?

You will need a spark plug socket of the correct size for your vehicle, which is commonly 5/8 inch, 13/16 inch, or 14mm. These are "deep" sockets designed specifically for spark plugs and often have a rubber or magnetic insert to hold the plug and protect its porcelain insulator. You will also need a ratchet and an extension to reach the spark plug.
 
This video shows how to remove spark plugs and the tools required: 59sbeachtrollYouTube · Sep 7, 2018
Key features of a spark plug socket

• Correct size: Spark plugs come in various sizes, with common sizes including 5/8 inch (16mm), 13/16 inch, and 14mm. It's crucial to get the right size to avoid stripping the plug or damaging it. 
• Deep design: The socket is deep enough to fit over the entire length of the spark plug. 
• Holding mechanism: A rubber boot, magnet, or metal clip inside the socket holds the spark plug, making it easier to remove it from the deep-seated engine well and to install the new one. 
• Extension compatibility: A spark plug socket will attach to a ratchet with an extension for reaching plugs in recessed areas. 

How to change spark plugs on a Toyota?

To replace Toyota spark plugs, disconnect the battery, remove the engine cover, ignition coils, and then unscrew the old plugs with a spark plug socket. Install new plugs by hand to avoid cross-threading, then tighten them with a torque wrench to the manufacturer's specification, reinstall the coils, and reconnect the battery.
 
This video demonstrates the process of replacing spark plugs on a Toyota Corolla: 53sTRQYouTube · Jun 24, 2025
Before you begin

• Ensure the engine is cool before starting. 
• Consult your owner's manual for specific replacement intervals and torque specifications for your model. 
• You will need new spark plugs, a torque wrench, a spark plug socket, and possibly other tools like a socket wrench and extension. 

Step-by-step instructions

1. Disconnect the battery: Disconnect the negative (black) terminal first to prevent electrical shock. 
2. Remove engine cover and ignition coils: If your vehicle has an engine cover, remove it. Then, remove the ignition coils by disconnecting their electrical connectors and unbolting them. 
3. Remove old spark plugs: Use a spark plug socket with an extension to carefully unscrew the old spark plugs from the engine. The socket has a rubber or magnetic insert to hold the plug for removal. 
4. Install new spark plugs: 
   • Place the new spark plug into the socket. 
   • Start the new plug into the cylinder head by hand to avoid cross-threading. 
   • Once the plug is finger-tight, use a torque wrench to tighten it to the manufacturer's specified torque. 
5. Reinstall ignition coils: 
   • Apply dielectric grease to the inside of the coil boot to help with future removal. 
   • Slide the ignition coil back into place, secure it with its bolt, and reconnect the electrical connector. 
6. Finish the job: Repeat the process for all remaining spark plugs. Reinstall the engine cover and reconnect the negative battery terminal. 
7. Start the engine: Turn on the engine to ensure it runs smoothly. 

Signs you need new spark plugs
Difficulty starting the engine, Rough idling, Sluggish acceleration, Decreased fuel economy, and Engine misfires.

What kind of tool do I need to change spark plugs?

To change spark plugs, you'll need a spark plug socket with a ratchet and extensions, a torque wrench for proper tightening, and a spark plug gap tool to set the gap on the new plugs. Other helpful tools include special pliers for spark plug wires and a way to clean the area, like a vacuum or compressed air. 
Essential tools

• Spark plug socket: A deep socket with a rubber insert or spring to hold the spark plug and protect its porcelain insulator. 
• Ratchet: A standard ratchet to turn the socket. 
• Ratchet extension: To reach the spark plugs, especially in tight spaces. A wobble extension or universal joint can be especially helpful. 
• Torque wrench: Crucial for tightening the new spark plugs to the correct specification in your owner's manual to avoid damage. 
• Spark plug gap tool: A tool to check and adjust the gap on the new spark plugs to the manufacturer's specifications. 

This video explains how to change spark plugs properly: 55sBosch MobilityYouTube · May 14, 2025
Recommended and optional tools

• Spark plug wire/boot pliers: Specialty pliers make it easier and safer to remove stubborn spark plug wires without damaging them. 
• Vacuum or compressed air: To blow away dirt and debris from the spark plug wells before removal to prevent debris from falling into the engine cylinder. 
• Dielectric grease: To apply to the inside of the spark plug boot to prevent arcing and help with future removal (Note: Anti-seize is not needed on many modern, coated plugs). 
• Glove/Nitrile gloves: To keep your hands clean. 
• Clean rag or paper towels: For wiping up any mess. 
• Screwdriver: Can be useful for prying off electrical connectors. 
• Wire loom spacers: To help manage wiring and keep it out of the way. 

What size socket for Toyota Yaris spark plugs?

The Toyota Yaris spark plug socket size is 16mm. You will also need a 10mm socket to remove the ignition coil bolts.
 
This video demonstrates the process of replacing spark plugs in a Toyota Yaris, including using a 16mm spark plug socket: 52sLorne Scott-WilsonYouTube · Jul 5, 2025

• 16mm spark plug socket: This is the primary tool for removing and installing the spark plugs themselves. 
• 10mm socket: This is used for removing the bolts that secure the ignition coils. 
• Extension bar: You will likely need an extension bar to reach the recessed spark plugs.