2002 X5 3.0D - DiS errors - what it have to do?

[plouat]

Hello! I have 2002 X5 3.0 diesel and sometimes the car does not increase rpm and does not accelerate.
In DIS i receive the following errors:
1. 3505 DDE: Glow plug or glow plug system (Glow plug system - glow plug or glow-plug relay)
2. 1260 DDE: Pre-supply pressure monitoring (Rate reduction due to low pre-supply pressure)
3. 1470 DDE: Charge air pressure control (-ve control deviation/charge-air press. too high)
4. 05 MRS: Side airbag, front left (Resistance too low)
5. 02 LRA: Sensor fault, front

What can i do for each error to solve it and get over it.

Thank you in advance!