Engine Error Codes Peroble

I have a 2004 Audi A8 D3 4.0 TDI and have got the following VCDS fault codes.

17022 - Throttle Body Actuator Bank 1 (J338)
P0638 - 000 - Implausible Signal
Freeze Frame:
RPM: 651 /min
Torque: 105.3 Nm
Speed: 0.0 km/h
Voltage: 13.22 V
Duty Cycle: 30.0 %
Bin. Bits: 00000000
Mass Air / Rev.: 340.8 mg/str
Mass Air / Rev.: 317.3 mg/str

18284 - Valve for Torque Support Mount
P1876 - 000 - Open Circuit
Freeze Frame:
RPM: 651 /min
Torque: 105.3 Nm
Speed: 0.0 km/h
Voltage: 13.45 V
Bin. Bits: 0
Bin. Bits: 0
Bin. Bits: 0
Temperature: 54.9°C

19699 - Control Circuit for Throttle Body Module
P3243 - 002 - Electrical Malfunction
Freeze Frame:
RPM: 651 /min
Torque: 105.3 Nm
Speed: 0.0 km/h
Voltage: 13.45 V
Duty Cycle: 30.0 %
Bin. Bits: 00000000
Mass Air / Rev.: 346.6 mg/str
Mass Air / Rev.: 317.3 mg/str


Anyone experience these problems or can suggest ow I go about resolving them

Thanks in advance.