For those that are not aware: ArenaGTR has an R33 GTR, thus oil levels and any oil related issues do not apply to an electronically controlled HICAS system.
Have you checked under the car, at the HICAS control unit? it could have been removed or it could be unplugged.
I would still check the s/wheel hub.
Have you ran a diagnostic on the ecu for error codes (never done one myself so you'll need to use the "search" button)
I would personally remove the HICAS unit, fit a HICAS lock bar, get a 4 wheel alignment and remove the bulb from the dash cluster. Problem solved