multiple faults

[accy]

Audi a4 1.9tdi avf 2004
For the past couple of months the car has been sluggish performance/economy wise.
Today while driving at steady 50 i decided to put my foot down but got no response.
Checked for codes and the following came up:

17957 control valve boost pressure - n75 open circuit / short with ground

17994/ Engine Mount Solenoid Valves (N144/N145): Short to Plus

18027 glow plug relay (j52) open or short to ground

17932/ Fuel Pump Relay (J17): Open or Short to Ground

The n75 valve and the fuel pump relay where replaced less than 3 weeks ago.
Why would the glow plug relay fault come on when the vehicle is running?

[kite]

Seems strange that all faults are short to ground, I would look for a broken wire.

follow me on twitter...kiteaudi...

[accy]

Seems strange that all faults are short to ground, I would look for a broken wire.

follow me on twitter...kiteaudi...

thanks for the response...
Where do i start looking for the broken wire?

[kite]

No idea, just Check over what you can see.

follow me on twitter...kiteaudi...

[Das Auto Center]

Would be worth checking if these codes are stored as 'sporadic', which would indicate a low voltage or, dare I say it, a ghost code. Obviously there is a problem, so as Kite Audi suggests, a broken wire/poor connection would be a fair assumption. Would suggest trying to get hold of a wiring diagram as you could identify where the break is most likely to occur as the wire would have to service all those components.
Im assuming the codes were cleared after the components replaced a few weeks ago?