S3 boost issues

[AARON77]

i need help locating a relay after having a problem with the boost on my s3 i did a diagnostic check and got the fault code P1517 my pal seems to thinks that this is a relay that is faulty and stopping the turbo from going through its motions can any help please???

 

[s3dave]

its the main ecu relay so i guess in the engine bay fusebox