RS2 boost cut at 5000rpm

[Jonas]

Hi experts
I have an RS2, with new stock turbo, wagner IC and manifold, 3" exhaust (no cat), ported head, adjust. cam gear, Porkkis chip.

Went to a trackday - it ran absolutely fantastic the first 3 hours
Then it suddenly began to cut boost, it goes from 1,6 bar to 0 when the needle hits 5000rpm. Its a permanent fail, but the car runs perfectly at lower rpm until the cut occurs.

VCDS:
2 faults keeps comming back:

00516 - idle contakt (F60)
30-00 no connection or short to +

00515 - Hallgeber (G40)
01-10 signal to + periodic

Have testet N75 valve, and idle regulator with VCDS - they clicks

The hallgeber is almost new
WG has not stuck. Camgear has not moved from the spots.

any ideas ???

[UrS4boy]

00515 Hall Sender fault code info

Pay attention to that 00515 Hall sensor code, it could be the key to your problem. Here is some reading you might find useful:

A 00515 story:

http://forums.quattroworld.com/s4s6/msgs/139944.phtml

And general Hall Sensor info:

http://forums.quattroworld.com/s4s6/msgs/22580.phtml