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The COBB Tuning Accessport V3 AP3-SUB-001 is the world’s most popular and user-friendly ECU tuning solution created specifically for early Subaru WRX performance enthusiasts. Designed to replace the factory ECU’s conservative calibration with more aggressive and optimized settings, this handheld device unlocks more horsepower, torque, and throttle responsiveness from your Subaru’s engine without compromising reliability. As an all-in-one performance tool, the Accessport V3 also provides real-time engine monitoring, customizable gauge displays, advanced performance measuring tools, and diagnostic trouble code reading—all from a bright, high-resolution color screen that’s easy to read in-vehicle.
Installation is simple and intuitive via the OBD-II port, with on-screen guidance to help you select and flash performance maps quickly. The Cobb AccessPORT AP3-SUB-001 supports up to 100 maps, allowing you to switch between Off-The-Shelf (OTS) tunes or custom calibrations as your vehicle’s modifications evolve. It also includes features that help you analyze acceleration performance, record data logs, and monitor key engine parameters in real time. When used according to the manufacturer’s application guide, this product is legal for sale and use on emissions-controlled vehicles in all 50 U.S. states under CARB Executive Order approval.
Note: This Accessport is intended for U.S. domestic market vehicles only. Always verify your vehicle’s exact model, engine type, and ECU before purchase.
Note : If the ECU has been replaced in your 2002-2005 WRX, support is NOT available for Subaru's newest ECU part numbers as follows:
It replaces your vehicle’s factory engine calibration with performance-oriented maps developed by COBB, improving throttle response, power delivery, and drivability. It also functions as an in-vehicle performance monitor and diagnostic tool.
No — the AP3-SUB-001 is specifically engineered for 2002–2005 Subaru WRX USDM models with the EJ205 turbo engine. It will not work on later WRX or non-turbo Subaru vehicles.
Yes — installation is plug-and-play via the OBD-II port, and the device includes intuitive on-screen guides that walk you through the process step by step.
When installed and used according to COBB’s application guide, the Accessport remains legal in all 50 U.S. states under CARB Executive Order approval.
No — the AP3-SUB-001 includes preloaded Off-The-Shelf (OTS) maps that provide noticeable improvements on a stock vehicle. Custom maps are also supported for modified setups.
Yes — it can read and clear diagnostic trouble codes (DTCs), which means you can troubleshoot engine lights and prevent unnecessary trips to a dealership.
Yes — it can store and switch between up to 100 maps, making it easy to manage different performance stages or tuning needs.
Absolutely — while the included OTS maps cater to stock and lightly modified vehicles, you can also load custom maps developed by professional tuners as your build progresses.
Yes — the Accessport’s uninstall function restores your ECU to its original factory calibration, making it easy to remove before selling or servicing your vehicle.
COBB Tuning products, including the Accessport V3, come with a 12-month limited warranty covering defects in materials and workmanship for the original purchaser when bought new from an authorized dealer. After the warranty period, support for Accessport products continues through COBB technical resources and Accessport Manager updates.
SKU:COBBAP3-SUB-001 ,UPC: ,Availability:
