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2004 Passat 187K miles, great car, GLS Wagon, Automatic... recent loss of boost,
problem ongoing for several weeks, misdiagnosis at dealer... since then, new turbo,
new egr, TB, WP, etc., new turbo boost sensor.... turn off restart, problem cleared
until next failure. Going slowly crazy trying to fix.... N75 looks clean... maybe time
to turn car into planter? hope not...
 

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You are getting limp mode. They key is that restarting the car clears the problem.

There are a number of possible causes and it's pointless to give a specific recommendation without the error codes. Read this article: http://www.myturbodiesel.com/1000q/multi/limp-mode-TDI-fix.htm and start by testing the more common causes and see if it fixes it.

FYI, also check out the B5 Passat DIY list in the FAQ, many interesting articles.
 
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