Crafter Error P0299 Charge pressure control Error and P246E Exhaust gas temperature Sensor 4

Hello, I drive a crafter 2010 with 110000km. 2.5L CECA I have the following errors: P0299 charging pressure control error P246E – exhaust gas temperature sensor sensor 4 To charge pressure error: Every time I accelerate in 4.5.6 gear, it falls into the emergency run after a few seconds. All seal on and around the turbo have been renewed as well as at the cracker. Turbo was delivered for repair. Nothing was found, works perfectly. Charging air cooler also seems to be tight. Can someone tell me what there is s is ? The sensor error is new ?????