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Dear All! I get the failure 17439 sometimes. I tested now the channel 142 with VCDS and it seems that value (in the most left box) is 100% when rpm is 800 (idling) and changes to 0% when rpm goes over 4000rpm. With low gear and gas pedal on the floor the value changes under 4000rpm ADP box on the right says okey. So I think I undesrstand that the vacuum unit is only operated by the under-pressure solenoid valve according to the load. There are four fault possibilities. 1. Solenoid is not functioning allways 2. Vacuum unit is not functioning allways 3. Potentiometer is giving wrong value sometimes 4. Flaps are stacking sometimes. Should I now change the solenoid valve, because it is easisest? Any ideas? Op P.S. Sorry for english text

Dear All! I tested now the channel 142 with VCDS and it seems that value (in the most left box) is 100% when rpm is 800 (idling) and changes to 0% when rpm goes over 4000rpm. With low gear and gas pedal on the floor the value changes under 4000rpm ADP says okey. So now I think I undesrstand that the vacuum unit is only operated by the solenoid valve according to the load. There is still all three possibilities. 1. Solenoid is not functioning allways 2. Vacuum unit is not functioning allways 3. Potentiometer is giving wrong value sometimes 4. Flaps are stacking sometimes. Should I now change the solenoid valve, because it is easisest? Op

This would be too much asked. Maybe someone remembers about the values. Most interesting is the pressure solenoid! I have not found anywhere the function of it. My understanding is, that the manifold is reacting by the under-pressure, which is generated by the car itself when loading the motor. But the solenoid valve, why it is there? Amazing! Nice forum! Helpful people! With Kind Regards: Op

Your english is good. My german is zero! I have checked the vacuum-unit when the fault was on and there was no under-pressure when I removed the suction pipe! After reseting the fault there was suction and when I removed the pipe the lever was moving and the idle sound of motor was changing! I suppose that the stick and suction-unit are okay and flaps are moving. When is the solenoid valve N316 open and when is it closed? Is it only open and close type or is it analog type? Is it really so that you need to remove whole manifold from motor side if potentiometer or vacuum unit has to be replaced.? I have not checked yet the channel 142. Do you have any percent values for idle (800rpm) and for higher revisions (5000rpm). Please help me! With Kind Regards: Op

Dear All A2 specialists! My A2 1.6FSI has this problem according to the Ross-Tech. Anybody can tell is it: 1. Solenoid valve 2. Solenoid itself 3. The manifold lever After the motor lamp went on first time I could see that lever was moving up and down. I reseted the failure. After two weeks the failure came back and now the lever was stucked. No under pressure to manifold. Is there a safety mode in the system or is the valve broken? First time when I took the under-pressure tube off and lever went down the idle-sound was different, so I suppose lever is not broken? Can I check the potentiometer values through the Ross-Tech software? Any help is good! Op