Loss of power - turbo? EGR? sensor? please help

[Gibson2913]

Hi guys, recently bought an audi a4 on 110k miles. since buying the car for £2000, i have spent nearly the same in repairs and garage fees. it has not been kind to me.

Recently got the car back after having a new timing belt kit, water pump, 2 new camshafts, aux belt - the list goes on. within a week, my EML came on after dropping down a gear and i have loss of power after around 2600 revs, along with a flashing glowplug light. 

 

ive been told by a friends "mechanically minded" dad, that the turbo is goosed, but then i have also been told it probably will be the EGR Valve or even a boost pressure sensor! good to mention that there is no smoke on acceleration etc.

codes found when plugged in:

p0299

05171

 

confused is not the word.

Any help is greatly appreciated as i genuinely think im going to write the car off at this point.

[Gibson2913]

amazing thanks all xxxxxxxxxxxxxxxxxxxxxxxxxxx

[Steve Q]

Sorry to hear of your situation and for the delayed reply. 

p0299 indicates turbo under boost. Before writing off the turbo if get your mechanic to check the turbo pipes, as over time these can perish and where they attach to the turbo they can let sir through when under pressure but would look fine when not under pressure if that makes sense. 

Your second fault code 05171 supports my theory as it implies a boost leak from a pipe or similar.