Turbo underboost
I have access to a factory diagnostic manual and it does not list a code 1400. Aftermarket scan tools are notoriously unreliable on reading Sprinter trouble codes correctly.
Trouble code P2146 means: Fuel Injector Group "A" Supply Voltage Circuit/Open
the fault is glow plug module
The OBDII error code of P0299 is a generic for a low boost condition. This could mean a turbo charger and or air induction system problems.
Trouble code P0513 means:Incorrect immobilizer key
Trouble code P1391 means: Intermittent loss of CMP or CKP
Trouble code P0440 means: EVAP Purge System Fault
Trouble code P0320 means:Ignition/Distributor engine speed input circuit malfunction
Trouble code P0463 means:Fuel level sensor circuit high input
Trouble code P0463 means:Fuel level sensor circuit high input
Trouble code P0401 means:Exhaust gas recirculation flow insufficient detected
Trouble code P0441 means: EVAP Purge Flow Monitor Fault