When Should You Replace the Timing Belt on Your 09 Subaru STI? A Comprehensive Guide to Timing Belt Maintenance

If you are a proud owner of an 09 Subaru STI, you know that it’s a high-performance vehicle that requires regular maintenance to keep it running smoothly. One vital aspect of maintenance that often gets overlooked or neglected is the timing belt. In this comprehensive guide, we’ll provide you with all the information you need to know about timing belts, their replacement schedules, and signs that may indicate when it’s time for a replacement.

What is a Timing Belt and How Does it Work?

The timing belt is a rubber belt that connects the crankshaft to the camshaft(s) in your Subaru STI’s engine. It’s responsible for keeping the engine’s valves and pistons in sync with each other. If your timing belt is worn, damaged or breaks, the engine’s valves and pistons will not be in sync, causing engine damage that can be expensive to repair.

The 09 Subaru STI was produced with a timing belt-driven engine. This means that it requires replacement at specific intervals to avoid failure or damage to engine components.

When Should You Replace the Timing Belt on Your 09 Subaru STI?

Subaru recommends that the timing belt be replaced at 105,000 miles or 105 months (8.75 years), whichever comes first. It’s important to stick to this schedule, as a failure to do so could result in severe engine damage.

See also  What Car Can Beat a Subaru STI?

It’s worth noting that other components can affect the lifespan of the timing belt. These include the tensioner, water pump, and pulleys. It’s recommended that these components be replaced at the same time as the timing belt, as it could save you from costly repairs in the long run.

Signs that Your Timing Belt Needs to be Replaced

There are a few signs that may indicate that your timing belt needs to be replaced sooner than the recommended interval:

  • Squeaking or chirping noise from the engine
  • Difficulty starting the vehicle
  • Engine misfires or backfires
  • Visible cracks or wear on the timing belt
  • Oil leaks near the timing belt

If you experience any of these signs, it’s recommended that you take your vehicle to a trusted mechanic for inspection and possible replacement.

How Much Will Timing Belt Replacement Cost?

The cost of timing belt replacement can vary depending on your location and the mechanic you choose. On average, timing belt replacement for an 09 Subaru STI can cost between $500 to $1000.

While this may seem costly, it’s important to remember that the cost of repairs due to a timing belt failure can be much higher. Replacing the timing belt at the recommended intervals is a small price to pay for peace of mind and avoiding expensive engine damage.


In conclusion, the timing belt is an essential component of your 09 Subaru STI’s engine. Paying attention to the recommended timing belt replacement schedule, as well as signs that may indicate that it needs to be replaced, can save you from costly engine damage in the future.

See also  Subaru STI’s Equipped with a 203 Transmission: The Ultimate Guide

By investing in regular maintenance, you can ensure that your high-performance vehicle continues to run smoothly for years to come. Don’t forget to replace the timing belt, tensioner, water pump, and pulleys at the recommended intervals to keep your engine running at its best.


Q: What happens if I don’t replace my timing belt?

A: If the timing belt breaks or becomes excessively worn, it can cause significant engine damage, resulting in costly repairs.

Q: Can I replace the timing belt myself?

A: It’s recommended that timing belt replacement be done by a certified mechanic, as it requires expertise and specific tools.

Q: How often should I have my timing belt inspected?

A: It’s recommended that you have your timing belt inspected every 30,000 miles, or whenever you experience signs of wear or damage.

Avatar photo

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.

Recommended Articles