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WRX / STI Code Readers


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I wanted to check the engine codes on my MY 2007 Impreza WRX however my current ELM-327 USB code reader gives a message that it cannot find a port to connect to when connected - its incompatible.

I checked the protocol for my WRX and it uses "KWP FAST" which I think is ISO 14230-4 KWP (fast init, 10.4 kbaud) :blink:

Can anyone advise me on getting a decent code reader for a Subaru WRX? What does everyone else use?

With Thanks. :)

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  • 3 weeks later...

ok having looked into this relentlessly, I see the Freessm software is best, however it's not been tested with Windows 8. So, this means it's not been given any future presently. It seems to work with Win 7 and XP but I've gone further.


So, Freessm appears to work on Android. So I may have to look at a Bluetooth adaptor/connector to get Freessm working.


If anyone has been down this Freessm route then I would appreciated any advice on what to get. With Thanks. :D

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  • 4 months later...

I got my standard ELM 327 OBDII code reader working :) Basically, the Universal Serial Bus controller FT4222 interface A needed assigning to the USB Serial COM Port. Once done - a quick and easy fix - the OBDII reader and PC software connected up to the engine's ECU. I can now read all codes on any car I've tried it on - nice. And I'm glad to say my WRX has no fault codes and is running well with O2 sensor operating and live data streaming. A really neat trick that may help you guys out.

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