Now i keep getting the above code on my mk1 vrs and it has been abit jerky. in the last 3 months its has had the following. Oil change sevice,air filter,new coil packs under recall,cleaned out TB . Replaced MAF with new dealer part after unpluging old unit and it did run better so i thought that would core the problem. While the jerkiness has all but gone i got 17705 back again last month and still hesitant. Car is booked in to garage on monday as i dont want to start replacing dv or n75 etc for the sake of it. I erased the code a few weeks back and as of yet it has not come back but car still not right. Will the garage be able to get more info from the ecu or do i need to wait until the code comes back?

17705/P1297/004759 - Pressure Drop between Turbo and Throttle Valve (check D.V.!)

Possible Symptoms

• Malfunction Indicator Light (MIL) ON
  
• Power Loss
  

Possible Causes

• Leaking Hoses and/or Pipes between Components
  
• Boost Pressure Control Valve (N249) faulty
  
• Diverter Valve faulty
  
• Throttle Body dirty
  
• Vacuum leak
  

Possible Solutions

• Check Hoses and Pipes between Components
  
• Check / Replace Boost Pressure Control Valve (N249)
  
• Check / Replace Diverter Valve
  
• Check / Clean Throttle Body
  
  • Perform Throttle Body Alignment (TBA)
    

  [*]Check for Vacuum leak(s) including PCV system

Special Notes

• Did anyone install an extra (wrong) dump valve?
  
• When found in the NAR 2.0T (BPY) check RVUTB: 01-09-03 or 2018919 for updated Crankcase Breather Valve
  
  • If the breather valve is faulty, full engine vacuum is typically found when removing the oil cap at idle.
    

  [*]When found in the 3B B5/B5.5 Passat 1.8T, check the PCV "bleeder valve" for example part number 06B-103-245

  • One way to troubleshoot the problem is to pinch closed the vent hose under the coolant bottle, that attaches to the bleeder valve and see if the idle smooths out.
    

- What DV have you got? i would consider investing in a Forge unit, its a serviceable unit so more cost effective than buying new ones each year they go pop.

everything is standard at the moment. The turbo pipe at the back of the engine to the pan cake is covered in oil and ****e and looks like it has seen better days but no engine light has come on.