Restricted performance error code

[Meccles]

Ok I have L320 RRS with 3.0 SDV6. If i jump on the throttle hard i get restricted performance fault flash up with this error code. If i'm a bit more gradual on the throttle - nothing. All engine temps etc perfect. Any suggestions?
https://www.aulro.com/mobile-gallery/86fab72bd4da7e48289eecc4e9a8490b.jpg

[Eric SDV6SE]

A quick Google points to a dodgy sensor or connection, or perhaps a leak upstream of the egt sensor, i.e manifolds or exhaust flange.