Subaru OEM Throttle Body Coolant Hose (15-21 WRX) | 21204AB290

Overview

The Genuine Subaru OEM Throttle Body Coolant Hose (Part #21204AB290) is the factory-correct replacement hose for 2015–2021 Subaru WRX models. Designed to maintain proper coolant flow through the throttle body, this hose ensures your engine's idle control and cold-start performance remain exactly as Subaru engineered them. If you're experiencing coolant leaks near the throttle body or proactively replacing aging rubber components, this is the exact-fit OEM solution.

Key Features & Benefits

• Genuine Subaru OEM Part – Manufactured to factory specifications, guaranteeing a perfect fit and function without modification.
• Exact-Fit Replacement – Engineered specifically for the 2015–2021 Subaru WRX, eliminating guesswork and fitment issues common with aftermarket alternatives.
• Factory-Grade Materials – Constructed from OEM-spec rubber compounds rated to withstand engine-bay heat cycles and coolant exposure for long service life.
• Maintains Throttle Body Function – Proper coolant circulation through the throttle body prevents icing and rough idle in cold conditions, preserving driveability.
• Backed by Subaru's Factory Warranty – Covered under Subaru's genuine parts warranty for peace of mind.
• Direct OEM Replacement – Restores the cooling circuit to factory condition, ideal for routine maintenance or leak repair.

What's Included

• 1x Genuine Subaru Throttle Body Coolant Hose (Part #21204AB290)

Specifications

Fitment & Compatibility

This hose is designed for the following vehicles:

Always verify your vehicle's VIN and consult your Subaru parts catalog to confirm fitment before ordering. This part is not shared with the WRX STI — confirm your model prior to purchase.

Installation

This is a straightforward hose replacement that can be performed by a mechanically inclined DIYer with basic hand tools. The vehicle should be fully cooled before beginning work. Drain or clamp the coolant circuit, remove the retaining clamps, swap the hose, and refill/bleed the cooling system as needed. Professional installation at a qualified Subaru service center is recommended if you are unfamiliar with cooling system repairs. No special tools or programming are required.