TTwhisperer

I ran my recently purchased RossTech diagnostic tester on my 2001 TT and got one error: 17608 Boost Pressure Control Valve (N249) mechanical malfunction. N249 turns out to be the recirculation control valve for the turbo. I located it but according to the workshop manual from Bentleys Publishers I need special tools for testing. I don't quite understand how this malfuction is sensed by the control unit. Also, it is supposed to be a mechanical valve but there is also a solenoid. Can anyone shine some light on this please and give some advise how to test without the special tool? When I put 12V on the solenoid it clicks and opens the valve.
Any ideas/suggestions very much appreciated.

TTschwing

see if it comes back. Some codes are often temporary glitches and may not indicate a consistently bad part. It's relatively rare for this part to fail..

SprinTTer

...turns out the diverter valve (Mitsubishi EVO VI type) was too stiff and could not be opened at low pressures. Thus, wastegate opened instead. Changed the dv, no problem thereafter. Chack for leaks at the hoses surrounding the N249, then check dv.