*** help *** diagnostic
 

iv had my 1997 impreza sport back today from my local garage due to running issues and loss of power when accelerating,
they advised me to take it to a specialist to get it checked out properly as they got no way of accesing the on board computer other than a blink test which came up
( throttle position sensor and mass air flow metre ) i did a blink test before i took it to the garage and it came up with the code for the knock sensor,
before i start spending money which i dont have to spend at the moment is there anyone in or around the south wales area who could get into the vehicle computer before i have to take it to subaru itself which i know will cost a fortune?

thanks in advance :)