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There has been a service bulletin for that type of concern. Here is what it states.
01 MIL on (P0299 - charge pressure control negative deviation)
21 08 05 2013060/6 December 22, 2008. Supersedes Technical Service Bulletin Group 21 number 08-01 datedJanuary 28, 2008 for reasons listed below.
MIL on. DTC P0299 (Charge pressure control, negative deviation) is stored in the ECM data memory.
The condition may be the result of an abnormal Turbocharger Recirculation Valve N249.
2008 audi A4 convertible - the soft top does not close.