WRX STI SECONDARY AIR INJECTION PUMP 37K MILE

WRX STI SECONDARY AIR INJECTION PUMP 37K MILE – OEM Reliability for Your EJ Engine

There’s nothing worse than firing up your Subaru WRX STI, only to be greeted with a check engine light, a rough idle, or the looming dread of a failed emissions test. Hidden within the engine bay, your secondary air injection pump plays a role most enthusiasts don’t think about—until it fails. That’s where the WRX STI SECONDARY AIR INJECTION PUMP 37K MILE comes in: an OEM component with just 37,000 miles of use, ready to restore efficiency, reliability, and emissions compliance to your Subaru.

This isn’t just another replacement part. It’s a factory-engineered pump designed to keep your EJ-powered STI running as Subaru intended—smooth, clean, and compliant. If you value OEM quality and a cost-effective solution, this low-mileage unit is exactly what you’ve been searching for.

What Exactly Does the Secondary Air Injection Pump Do?

The WRX STI SECONDARY AIR INJECTION PUMP 37K MILE is part of your emissions system. Its job? To inject fresh oxygen into the exhaust stream during cold starts. This oxygen feeds the catalytic converter, allowing it to heat up faster and burn off excess hydrocarbons. The result is:

• Cleaner emissions from the moment you start your STI.

• A smoother idle during warm-up.

• An engine that’s fully compliant with emissions standards.

Think of this pump as your EJ engine’s “emissions assistant.” Without it, your car struggles to stay eco-friendly and inspection-ready.

Why Choose a 37K Mile OEM Pump?

Enthusiasts often ask: Why buy a low-mileage OEM part instead of an aftermarket replacement? The answer comes down to three key reasons:

1. Proven OEM Quality – Subaru designed this pump specifically for the WRX STI. With an exact fit and factory-grade reliability, you won’t have to worry about poor construction or compatibility issues.

2. Low Mileage Sweet Spot – At only 37,000 miles, this pump has plenty of life left. It’s far from worn out, making it a smart and cost-effective alternative to buying brand new.

3. Avoid Aftermarket Risks – Aftermarket air injection pumps often cut corners on materials and design. OEM ensures you get the performance and longevity your Subaru deserves.

For Subaru owners who won’t compromise on quality, the WRX STI SECONDARY AIR INJECTION PUMP 37K MILE delivers both confidence and savings.

How to Know if You Need a Replacement

Wondering if your pump is on its way out? Here are some tell-tale signs:

• Check Engine Light Codes like P0410, P0411, P2440, or P2444.

• Whining or grinding noises from the engine bay on startup.

• Failed emissions tests even if everything else seems fine.

• Rough cold starts where the engine stumbles until it warms up.

If you’ve noticed one or more of these symptoms, upgrading to this WRX STI SECONDARY AIR INJECTION PUMP 37K MILE is the easiest way to restore factory performance.

Installation: Straightforward, With a Big Payoff

Replacing the secondary air injection pump is a moderate DIY task for someone comfortable working on Subarus, though many enthusiasts prefer professional installation. The process typically involves:

1. Disconnecting the battery.

2. Removing the intercooler to access the pump.

3. Disconnecting electrical and vacuum lines.

4. Swapping in the WRX STI SECONDARY AIR INJECTION PUMP 37K MILE.

5. Re-securing connections, reinstalling components, and clearing any stored codes.

Once installed, your WRX STI will thank you with smooth cold starts and emissions compliance.

Frequently Asked Questions

Q1: Will the WRX STI SECONDARY AIR INJECTION PUMP 37K MILE fit all WRX models?
A: No. This pump is designed specifically for WRX STI models equipped with the EJ engine and secondary air system. Always confirm compatibility with your vehicle’s year and trim before purchase.

Q2: Do I need to clear codes after installing the pump?
A: Yes. After installation, you’ll need to clear any stored CEL codes. Once the new pump is in place, the system will function normally, and the codes won’t return.

A Question for You

When you start your Subaru, do you want to risk CEL headaches, failed emissions tests, and unreliable performance—or would you rather drive with confidence knowing you’ve installed an OEM WRX STI SECONDARY AIR INJECTION PUMP 37K MILE with proven reliability?

Why OEM Over Deletion?

Some WRX STI owners consider deleting the system altogether. But here’s why OEM is the smarter choice:

• Stay Street-Legal – Deleting the system often results in failed state inspections.

• Protect Resale Value – A compliant Subaru holds value better than one hacked together with deletes.

• Preserve Factory Reliability – Subaru engineered this system to work with your EJ engine for long-term durability.

With the WRX STI SECONDARY AIR INJECTION PUMP 37K MILE, you keep your STI factory-correct while avoiding unnecessary problems.

• Pair your new pump with a WRX STI Catalytic Converter to maximize emissions efficiency.

• Browse more 04 WRX STI RADIATOR COOLING ASSEMBLY for reliability upgrades.

• Check out Subie Suspension & Axle online to complete your setup.

Final Thoughts

The WRX STI SECONDARY AIR INJECTION PUMP 37K MILE is more than just a replacement—it’s peace of mind for your Subaru. With low mileage, OEM engineering, and a proven track record of reliability, this pump ensures your EJ engine runs clean, smooth, and compliant.

Don’t gamble on aftermarket parts or risk deleting a system that keeps your Subaru legal and efficient. Instead, choose the OEM solution that strikes the perfect balance between cost and performance.

Your WRX STI deserves nothing less. Equip it with the WRX STI SECONDARY AIR INJECTION PUMP 37K MILE today and enjoy worry-free cold starts, cleaner emissions, and the confidence of OEM reliability.

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