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Revision as of 14:33, 10 March 2013 by Andy (talk | contribs)

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
  • 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.