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Unlock the Full Potential of Your 2002-2005 Subaru WRX with the Cobb AP3-SUB-001 Accessport V3
The Cobb AP3-SUB-001 is the Accessport V3 ECU tuning device engineered specifically for the 2002-2005 Subaru Impreza WRX with the 2.0L EJ205 turbocharged engine. It is the world's best-selling, most flexible, and easiest-to-use ECU upgrade solution for the GD-chassis WRX, allowing owners to replace the conservative factory ECU calibration with performance-focused maps that increase boost, refine ignition timing, and optimize fuel delivery. The AP3-SUB-001 arrives preloaded with a full library of dyno-developed Off The Shelf (OTS) maps covering Stage 1 and Stage 2 configurations on 91 and 93 octane fuel, as well as specialty maps for economy, anti-theft, and valet modes. The large full-color high-resolution screen allows real-time monitoring of up to six engine parameters simultaneously, while onboard data logging stores up to 10 hours of multi-channel sensor data for tuner review. CARB Executive Order D-660-16 certifies the AP3-SUB-001 for 50-state street legality. Compatible with USDM vehicles only. If the ECU has been replaced in your 2002-2005 WRX, verify your ECU part number against the unsupported list before purchasing.
Key Features
- ECU flashing via OBD-II port with preloaded OTS performance maps for Stage 1 and Stage 2 at 91 and 93 octane
- Large full-color high-resolution screen with customizable multi-gauge display showing up to six live engine parameters
- Onboard data logging stores up to 10 hours across multiple channels for tuner analysis
- Read and clear engine diagnostic trouble codes without a dealership visit
- Performance measurement suite: 0-60 mph, 60-foot, and quarter-mile ET and trap speed
- Shift light with custom RPM warning for manual transmission drivers
- Launch Control supported on manual transmission models (Flat-Foot Shift not available on this generation)
- Simple one-button uninstall returns ECU to factory condition
- Interchangeable faceplates for personalization (black and silver included)
- CARB EO D-660-16 certified, 50-state street legal
- Compatible with Accessport Manager software for PC and Mac map management and firmware updates
Vehicle Fitment
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2002-2005 | Subaru | Impreza | WRX (2.0L Turbo, USDM, sedan and wagon, MT and AT) |
Specifications
| Detail | Value |
|---|---|
| Part Number | AP3-SUB-001 |
| Generation | Accessport V3 |
| Compatible Engine | Subaru EJ205 2.0L Turbocharged |
| Compatible Chassis | GD (2002-2005 Impreza WRX) |
| Market | USDM only |
| Screen | Full-color high-resolution display |
| Live Gauge Channels | Up to 6 simultaneous parameters |
| Data Log Storage | Up to 10 hours |
| Map Storage | Up to 100 maps |
| CARB Status | CARB EO D-660-16 (50-state legal) |
| UPC | N/A |
What's Included
- 1x Cobb Accessport V3 device
- Black faceplate (installed)
- Silver faceplate
- OBD-II connection cable
- Initialization connector (blue for 2002 WRX, white for 2003-2005 WRX)
- Vehicle mount hardware
- Preloaded OTS performance map library
About COBB Tuning
COBB Tuning is a leading developer of ECU tuning hardware, software, and supporting performance modifications for turbocharged sport vehicles. The Accessport is COBB's flagship product and the world's most widely used handheld ECU tuning device, covering Subaru, Ford, Porsche, Nissan, Mitsubishi, BMW, and Mercedes-Benz platforms. All COBB OTS maps are dyno-developed and tested across a range of altitudes, temperatures, fuel qualities, and octane ratings at COBB facilities before release.
Related Parts on Our Site
- Cobb AP3-BLACK-FACEPLATE Accessport V3 Black Faceplate - Replacement matte black faceplate for the Accessport V3
- Cobb AP3-GREY-FACEPLATE Accessport V3 Grey Faceplate - Replacement grey faceplate for the Accessport V3
Frequently Asked Questions
What is the Cobb AP3-SUB-001?The Cobb AP3-SUB-001 is the Accessport V3 ECU tuning device for the 2002-2005 Subaru Impreza WRX with the 2.0L EJ205 turbocharged engine. It plugs into the OBD-II port and flashes the factory ECU with performance calibrations, while also functioning as a real-time gauge display, data logger, and diagnostic code reader. It is the world's best-selling ECU tuning solution for this platform.
What years and trims does the AP3-SUB-001 fit?The AP3-SUB-001 fits 2002-2005 Subaru Impreza WRX models with the 2.0L EJ205 turbo engine in USDM specification, covering both sedan and wagon body styles and both manual and automatic transmissions. It does not fit the WRX STI, non-turbo Impreza, 2006-2007 WRX, or any 2008+ WRX or STI. Those vehicles require a different Accessport part number.
What OTS maps are included with the AP3-SUB-001?The AP3-SUB-001 arrives preloaded with COBB's OTS map library for the 2002-2005 WRX, including Stage 1 and Stage 2 maps for 91 and 93 octane fuel, along with economy, valet, and anti-theft maps. Stage 1 maps on 93 octane typically deliver approximately 15% more horsepower and 20% more torque over stock. Stage 2 maps require supporting bolt-on modifications and yield up to 23% horsepower and 31% torque gains.
Does the AP3-SUB-001 support Launch Control?Yes. Launch Control is supported on 2002-2005 WRX models with a manual transmission. It limits RPM at launch to build boost and improve consistency off the line. Flat-Foot Shifting is not available on this generation due to hardware limitations of the EJ205 ECU platform.
My 2002-2005 WRX had its ECU replaced by a dealer. Will the AP3-SUB-001 still work?Not necessarily. If the ECU was replaced by Subaru, specific newer ECU part numbers are not supported. The unsupported part numbers are: 2002 WRX MT/AT (22611AF427), 2003 WRX MT/AT (22611AJ034), 2004 WRX MT (22611AH795), 2004 WRX AT (22611AH805), 2005 WRX MT (22611AJ892), and 2005 WRX AT (22611AJ920). Check the label on your ECU before purchasing.
Is the AP3-SUB-001 legal in California?Yes. The Cobb AP3-SUB-001 holds CARB Executive Order D-660-16, certifying it as emissions compliant for use on public roads in all 50 states including California. COBB OTS maps maintain all emissions control systems in their functional state.
Can I return my WRX ECU to stock after using the AP3-SUB-001?Yes. The Accessport V3 includes a simple one-button Uninstall function from the main menu that returns the ECU to its exact factory state. The device must remain connected to the vehicle whenever a non-stock map is flashed. Run Uninstall before any dealership service appointment or before selling the vehicle.
What is the installation process for the AP3-SUB-001 on a 2002-2005 WRX?Installation requires enabling Test Mode by connecting the green Test Mode connectors under the driver's side dash, then plugging in the vehicle-specific Initialization Connector (blue for 2002, white for 2003-2005) before flashing. After those connectors are in place, plug the OBD-II cable in, follow the on-screen prompts, and select your map. Full instructions are available in the Cobb Accessport V3 Subaru User Manual on the COBB support portal.
Installation Instructions
- Download and install Accessport Manager on your PC or Mac. Update the AP3-SUB-001 firmware to the latest version before beginning.
- With the ignition off, locate the green Test Mode connectors under the driver's side dash to the left of the steering column. Connect the two green connectors together to enable Test Mode.
- Locate the Initialization Connector near the Test Mode connectors. Use the blue connector for a 2002 WRX or the white connector for a 2003-2005 WRX. Plug it into the corresponding connector under the dash.
- Connect the Accessport V3 OBD-II cable to the vehicle OBD-II port under the dash and to the port on the bottom of the Accessport.
- Turn the ignition to the ON position with the engine off. The Accessport will power on and launch the setup wizard.
- Follow the on-screen instructions to identify your vehicle and select the appropriate OTS map for your fuel type and modification level.
- Allow the flash to complete fully. Do not disconnect the Accessport or turn off the ignition during flashing.
- Once complete, disconnect the Initialization Connector and restore the Test Mode connectors to their original unplugged position.
- Start the vehicle and verify normal operation. Mount the Accessport using the included hardware in a visible, secure cabin location.
- Use Accessport Manager to download additional maps, review datalogs, or update firmware as needed.
COBB
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