Abstract: This article covers fault codes caused by a faulty secondary air injection pipe.
Applies to: BMW 5 Series V8 (N62) Engine 2004, 2005, 2006, 2007, 2008, 2009 and 2010 model years (E60)
Secondary air fault codes P0491, P0492 functional check low / insufficient flow.
These codes are set when secondary air system is activated and