Boost pressure sensor 1, replacing: Finishing
WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Start the engine and check for leaks.
Check that the charge air pressure sensor works properly.
Read off the diagnostic trouble codes and then clear them.