Fault criteria:

WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

Test 1: Current air mass per combustion is 100 mg/c higher than requested. Charge air control valve PWM has dropped to lowest possible.
Test 2: Charge air pressure exceeding 200 kPa. Throttle position reduced more than permitted.