Limp mode loss of turbo boost

[dan2134]

Hi I hope someone can Help me.

My turbo goes into limp mode.

I know the turbo is ok ive just replaced it with a new unit from audi, its also had a new air meter again from audi and all the vac lines replaced, at present the egr valve is disconected (pipe pluged) I'm looking for ideas to try next thanks.

[nevo]

Get it scanned for codes,find out why its going to limp.

[dan2134]

Ive scanned it no codes

[Crasher]

I can’t see how it is going into limp mode without leaving a code, that is not possible. What are you reading the codes with?

[dan2134]

vag-com a shareware copy the only fault i get is the left engine mount

[nevo]

Was it a new actuator.

[Crasher]

If the engine ECU is going into limp I have never seen this without a fault code. Can you describe how you think it is going into limp mode?

[dan2134]

Yes it was a new actuator it was complete new turbo from audi.

It goes in to limp mode after ive driven it at normal speed and then demand power say to join the motorway.

I know the turbo and air meter are ok, would having the EGR valve disconected and the vac pipe pluged cause this to happen and would it be worth changing the intake pressure sensor.

Just thought I run a K&N panel filter.

Thanks for all the Help this is driving me mad.

A4 Avant 1.9 TDI Sport 130 awx engine.

[arman123]

If you are getting any lights on the dash when it goes into limp mode then you will get a code when you scan it if no lights then when it goes into limp mode don't turn the key on and off and scan it in limp mode you will a code

[dan2134]

I get no lights on the dash.

I have driven it tonight with my laptop conected when it went in to limp mode I scaned for codes this is what it came back with.

- 17994/P1586/005510 - Engine Mount Solenoid Valves (N144/N145): Short to Plus
- 17965/P1557/005463 - Charge Pressure Control: Positive Deviation
- 18043 (i can't find what this is)

I hope someone can help.