How to Replace Spark Plug in Subaru Forester: A Step-by-Step Guide

If you own a Subaru Forester, you know how important it is to keep it in top condition. One of the easiest ways to do this is by replacing the spark plugs regularly. In this guide, we will show you how to replace the spark plugs in your Subaru Forester step-by-step.

Key Takeaways:

  • Replacing spark plugs regularly can improve the performance of your vehicle.
  • It is recommended to replace spark plugs every 30,000 miles or every 3 years.
  • Always check your vehicle’s owner manual for specific instructions and recommendations.

Tools and Materials:

  • Spark plug socket
  • Ratchet
  • Extension
  • Anti-seize lubricant
  • Torque wrench
  • New spark plugs


Step 1: Park the car in a safe location

Make sure the car is parked in a safe and flat location with enough space to work on. Turn off the engine and let it cool down completely. Disconnect the negative battery terminal to avoid any electric shock or other electrical hazards.

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Step 2: Locate the spark plugs

Open the hood of your Subaru Forester and locate the spark plugs. They are usually located on top of the engine block, close to the cylinder head.

Step 3: Remove the old spark plugs

Using a spark plug socket, ratchet, and extension, remove the old spark plugs by turning them counterclockwise. Be careful not to break the spark plugs, as it can be challenging to remove the remaining pieces.

Step 4: Check the condition of old spark plugs

Inspect the old spark plugs for any signs of wear or damage, such as cracks, oil deposits or carbon buildup. If the old spark plugs show any of these signs, it’s time to replace them.

Step 5: Apply anti-seize lubricant to new spark plugs

Apply a small amount of anti-seize lubricant to the threads of the new spark plugs before installing them. This will help prevent the new spark plugs from seizing up in the engine block.

Step 6: Install the new spark plugs

Install the new spark plugs using the spark plug socket, ratchet, and extension, and tighten them by turning them clockwise. Make sure not to overtighten the spark plugs, as it can cause damage to the engine.

Step 7: Torque the new spark plugs

Using a torque wrench, torque the new spark plugs according to the recommended specifications in your vehicle’s owner manual.

Step 8: Reconnect the battery terminal

Reconnect the negative battery terminal that was disconnected in step 1.

Step 9: Check the new spark plugs

Start the engine and check the new spark plugs for proper operation. If you notice any issues, such as misfiring or rough idling, recheck the installation and try again.

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Q: How often should I replace my spark plugs in my Subaru Forester?

A: It is recommended to replace spark plugs every 30,000 miles or every 3 years, whichever comes first.

Q: What are the signs that tell me to replace my spark plugs?

A: Some signs of worn spark plugs include slow acceleration, poor fuel economy, engine misfires, and difficulty starting the engine.

Q: Can I replace the spark plugs myself?

A: Yes, you can replace the spark plugs yourself with the right tools and instructions. It is a relatively simple process, but it is essential to follow the correct steps to avoid damage to the engine.

Q: What kind of spark plugs should I use in my Subaru Forester?

A: Always use the recommended spark plugs that are specified in your vehicle’s owner manual.

Congratulations! You have successfully replaced the spark plugs in your Subaru Forester. You can now enjoy the improved performance and fuel efficiency of your vehicle. Remember to replace the spark plugs regularly to keep your car running smoothly.

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Billy Covington

With a passion for all things automotive, Billy is our go-to expert on Subaru performance upgrades and modifications. He's been featured in several car magazines and blogs, and his extensive knowledge and expertise make him a valuable member of our team. When he's not working on cars, he enjoys playing guitar and writing music.

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