Caddy mk3 pd105 limp mode and rough starting sometimes

[sonny_h_09]

Ive just purchaced a 2008 caddy and its got stuck in limp mode was originally told it was maf sensor but after clearing codes im stuck with these 3 faults
000833 - Camshaft Position Sensor (G40)
P0341 - 000 - Implausible Signal - Intermittent

001602 - Sensor Reference Voltage A
P0642 - 000 - Voltage too Low - Intermittent

008214 - Intake Manifold Flap Position Sensor (Bank 1)
P2016 - 000 - Short to Ground - Intermittent
anyone had this before is a dodgy relay or fuse or something more serious?