WRX STI SECONDARY AIR INJECTION PUMP 9K MILES

WRX STI SECONDARY AIR INJECTION PUMP 9K MILES – Low Mileage, OEM Reliability You Can Trust

When you’re building, restoring, or maintaining your Subaru, the small but essential components often make the biggest difference. One of those crucial parts is the WRX STI SECONDARY AIR INJECTION PUMP 9K MILES—a low-mileage OEM replacement that ensures your performance machine runs clean, efficient, and fully compliant with emissions standards. If your STI has ever thrown a CEL related to air injection or suffered from a failing pump, you know just how vital this system is.

This isn’t just another used component. With only 9,000 miles, this secondary air injection pump has barely been broken in. It offers the perfect solution for WRX STI owners who want the peace of mind that comes with genuine OEM parts, but without the high cost of buying brand new.

What Is the WRX STI Secondary Air Injection Pump?

The WRX STI SECONDARY AIR INJECTION PUMP 9K MILES is part of your Subaru’s emissions system. Its job is simple yet critical: to inject fresh air into the exhaust stream during cold starts. By doing so, it helps the catalytic converter heat up faster, reducing harmful emissions and ensuring your WRX STI remains environmentally friendly and compliant with emissions regulations.

Think of it as the “jump start” your catalytic converter needs each time you fire up your EJ engine. Without a properly functioning secondary air injection pump, you could run into rough idling, check engine lights, failed emissions tests, and decreased efficiency.

Why Choose a 9K Mile OEM Pump?

1. Low Mileage Advantage – With only 9,000 miles, this unit offers near-new performance without the price tag of a brand-new OEM part.

2. OEM Fitment – Designed by Subaru for the WRX STI, ensuring a direct bolt-on installation with factory reliability.

3. Cost-Effective Solution – Why risk an aftermarket pump with questionable longevity? A genuine OEM piece keeps your engine running smoothly for the long haul.

4. Preserves Performance & Compliance – Keeps your Subaru road-legal and emission compliant without sacrificing horsepower or reliability.

For enthusiasts, using genuine Subaru parts like this is a no-brainer. The WRX STI SECONDARY AIR INJECTION PUMP 9K MILES balances affordability with OEM quality—a rare find in today’s used parts market.

How Does It Work?

When you start your WRX STI cold, the engine initially runs rich, producing excess hydrocarbons in the exhaust. The secondary air injection pump solves this by pushing fresh oxygen into the exhaust stream, allowing the catalytic converter to reach operating temperature faster.

This means:

• Cleaner emissions at startup

• Faster readiness for OBD system checks

• Reduced likelihood of failed state inspections

• A smoother, more reliable cold start

It’s a behind-the-scenes hero—quietly working to ensure your Subaru meets performance and environmental standards.

Common Signs You Need a Replacement Pump

Wondering if your current pump is failing? Here are some signs:

• Check Engine Light (CEL) with codes like P0410, P0411, or P2444

• Unusual noises during startup (a whining or grinding pump)

• Failed emissions test

• Engine running rough during cold starts

If any of these sound familiar, it might be time to swap in a low-mileage OEM unit like the WRX STI SECONDARY AIR INJECTION PUMP 9K MILES.

Installation & Fitment

This part is a direct-fit replacement for WRX STI models equipped with the EJ engine and secondary air injection system. Installation is straightforward for anyone experienced with Subaru maintenance, but here are the basics:

1. Disconnect the battery.

2. Remove the intercooler for better access.

3. Unbolt and disconnect the old pump.

4. Install the WRX STI SECONDARY AIR INJECTION PUMP 9K MILES using factory hardware.

5. Reconnect everything, clear any stored codes, and enjoy the benefits of a properly functioning system.

A professional install is recommended if you’re not comfortable working in tight engine bay spaces.

Frequently Asked Questions (FAQ)

Q1: Will this pump fit all WRX models?
A: No. This specific pump is designed for WRX STI models equipped with the EJ engine and air injection system. Always verify compatibility before purchasing.

Q2: Do I need to reprogram or tune my ECU after installation?
A: No reprogramming is necessary for a direct OEM replacement. Simply install, clear any CEL codes, and you’re good to go.

Why Not Just Delete the System?

Some owners consider bypassing or deleting the secondary air injection system. While this may seem tempting, it comes with consequences:

• Failed inspections in states with emissions testing.

• Check Engine Light that won’t go away.

• Reduced resale value since your Subaru won’t be emissions-compliant.

By installing a genuine WRX STI SECONDARY AIR INJECTION PUMP 9K MILES, you keep your Subaru street legal while enjoying OEM-level reliability.

A Question for You

When you start your Subaru, do you want to worry about CEL codes, failed emissions, and rough idling—or do you want the confidence of knowing your EJ engine is backed by an OEM WRX STI SECONDARY AIR INJECTION PUMP 9K MILES?

• Explore more WRX STI Emission Components to keep your build compliant.

• Pair this with a new STI RADIATOR COOLING FANS MOTOR SET for maximum efficiency.

• See our full catalog of WRX STI OEM Engine Parts for more replacements.

Final Thoughts

The WRX STI SECONDARY AIR INJECTION PUMP 9K MILES is more than a part—it’s a lifeline for your Subaru’s reliability and compliance. With its low mileage, OEM engineering, and direct-fit design, this pump ensures your EJ engine runs clean, efficient, and ready for whatever the road (or track) throws your way.

Don’t risk aftermarket substitutes or neglect this critical system. Equip your Subaru with a pump that’s as reliable as the day it rolled off the assembly line. The result? A smoother-running STI, no CEL headaches, and the confidence that comes with genuine OEM quality.

Upgrade your build today with the WRX STI SECONDARY AIR INJECTION PUMP 9K MILES—because true Subaru enthusiasts know that OEM is always the way to go.

The product might show a few cosmetic signs of usage, but it works perfectly and operates as expected.