Outline of the SAS diagnosis strategy
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2010 BMW M6, 2010 BMW M5, 2009 BMW M6, 2009 BMW M5, and 2008 BMW M6. However, it is still accessible from the selected car via links, so may be relevant.
In order to ensure the functionality of the secondary air system (SAS), a check of pump (SAP), secondary air valves and hoses is performed. It uses a secondary air flow meter (SAFM) to verify the amount of secondary airflow through the system and the oxygen sensors in order to allocate the malfunctioning engine side of the SAS.