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Troubleshooting Low Boost/Vacuum


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After a year of ownership, I noticed a decrease in power and the appearance of the Engine Check Light in the last four to five months.
I am able to clear the code P0299 (Low boost) using a diagnostic checker. However, it reappears a little distance down the road.
No leaks were found when I tested all of the hoover lines with the smoke tester. Everything is Okay with the intercooler and both hoses.

The EGR Actuator, however, remains inactive throughout beginning and throttling. The actuator is free to operate while using a vacuum hand pump.
The brake servo would undoubtedly provide symptoms if the vacuum in the system wasn't present, but those brakes are sharp and strong.

Ideas are what I'm seeking. Is anyone able to lend any assistance? 

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In my understanding, they are standard on the lower intercooler hose. Have you made sure both times? Prior to this, I had one that only let smoke out during the smoke test and only leaked while I was under boost.

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I appreciate you providing the data. After removing the Red and Black ones, I looked inside for damage or cracks and made sure the O-rings were in good shape.
Both of them were attractive. The smoke test was performed after the reinstallation, with the red hose being connected to the engine before the turbo was mounted. The intercooler and black hose were checked afterwards.

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Your name slipped my mind.
Following your suggestion, I gathered further information and discovered a comparable problem with an A Series.
Yesterday, I received the Vacuum Pressure Transducer that I bought from GSF.

After clearing all the errors and replacing the transducer, I was able to get my car back today.
Works Great!
I appreciate you pointing me in the correct way.

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