Found this trawling back through some old posts on the subject.

Can anyone confirm if this is correct for my MY99 STi5 RA
http://upload.turbosport.co.uk/galle...3370964774.gif

Cheers
John

That's Pin 21 of B136 by the way ;)

To check go to ravensblade impreza click on 'all modifications' then scroll down to the bottom and click on 'wiring guide' then click on 'Link Install/User's Guide' and you want page 34 of the PDF...! it looks like you where right..!

It could be worth getting some tips from bob rawle of how to fit the lambda link.. i took his advice and fitted it as follows..

First off i found an ignition live, then took the 'engine earth' to the bottom bolt holding the ECU in place, then the normal earth to any good chassis earth and finally took the signal wire to the appropriate wire at the ECU... this is different to the lambda link instructions but bob has tried wiring it in the way in the intructions and found it to be more reliable in the way i explained above..!

This way removes the need to send wires into the engine bay..! i would add that you can take all the wires to the ECU i.e find an ignition live and a chassis earth at the ECU..

Dan:D:D:D