How to Change the Spark Plugs in Your 2010 Subaru Forrester: A DIY Guide to Saving Money on Car Maintenance

If you own a 2010 Subaru Forrester and are looking to save money on car maintenance, changing the spark plugs yourself can be a great way to do so. While it may seem daunting, with the right tools and instructions, it’s a relatively simple process that can be completed in just a few hours. In this article, we’ll go over the basic steps for changing spark plugs in a 2010 Subaru Forrester and provide some troubleshooting tips to help you get the job done.

Tools Needed

Before you start, make sure to gather all the necessary tools to make the job easier. You’ll need a socket wrench, spark plug socket, extension bar, torque wrench, and a gap tool. You may also want to have some dielectric grease on hand.

Step-by-Step Instructions

  1. Begin by locating the spark plugs. In a Subaru Forrester, they are located on top of the engine and are easy to access.

  2. Next, remove the spark plug wires from the spark plugs by gently pulling on them. Be careful not to pull on the wires themselves, as this can cause damage.

  3. Using the socket wrench, fit the spark plug socket onto the spark plug and turn it counterclockwise until it comes loose.

  4. Remove the old spark plug and check the gap to ensure it matches the gap of the new spark plug. If it doesn’t, adjust the gap accordingly using the gap tool.

  5. Apply a thin layer of dielectric grease to the metal shell of the new spark plug. This helps to prevent corrosion and makes it easier to remove in the future.

  6. Using the socket wrench, gently screw in the new spark plug and tighten it until it is snug.

  7. Finally, attach the spark plug wire back onto the spark plug. Use the torque wrench to tighten it to the correct torque specification, which can usually be found in your Subaru Forrester owner’s manual.

  8. Repeat the process for each spark plug until you’ve replaced them all.

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Troubleshooting Tips

While changing spark plugs is a straightforward process, there are a few common issues that may arise. Here are some tips to help you troubleshoot:

  • If you have trouble removing the old spark plugs because they are stuck, you can use a spark plug removal tool to help loosen them.
  • If you notice that your engine is still misfiring or running rough after changing the spark plugs, it could be due to a faulty ignition coil or other issue.
  • If you accidentally over-tighten the spark plugs, it can lead to cross-threading or damage to the threads. Make sure to use a torque wrench and follow the recommended torque specifications to avoid this issue.


Q: How often should I change the spark plugs in my Subaru Forrester?

A: It’s recommended to change your spark plugs every 30,000 to 60,000 miles. However, this can vary depending on your driving habits and the conditions you drive in.

Q: Can I use any brand of spark plugs in my Subaru Forrester?

A: It’s best to stick with the recommended brand of spark plugs for your specific model of Subaru Forrester. This information can be found in your owner’s manual.

Q: Is it necessary to replace all the spark plugs at once?

A: It’s recommended to replace all the spark plugs at once rather than just one or two. This helps to ensure that your engine is running smoothly and efficiently.

In conclusion, changing the spark plugs in your 2010 Subaru Forrester is a DIY task that can save you money on car maintenance. By following these simple steps and troubleshooting tips, you can get the job done quickly and easily. Remember to follow the torque specifications and use the recommended tools and spark plugs for your specific model.

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Alton Brobst

As a longtime Subaru enthusiast, Alton brings a wealth of knowledge and experience to our blog. From his early days of tinkering with engines to his current role as a certified Subaru technician, Alton has seen it all when it comes to Subarus. When he's not working on cars, he enjoys hiking and exploring the great outdoors.

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