17705:
Possible Causes
Leaking hoses and/or pipes between components
Check Boost Pressure Control Valve (N249)
Possible Solutions
Check hoses and/or pipes between components
Check / Replace Boost Pressure Control Valve (N249)
Check / clean Throttle Valve, do Throttle Body Alignment
16395
Possible Causes
Camshaft Adjustment Valve 1 (N205) faulty
Fuel Pump Relay (J17) faulty
Possible Solutions
Check Camshaft Adjustment Valve 1 (N205)
Check Fuel Pump Relay (J17)
That might give you some info to search on - that is from
http://wiki.ross-tech.com