2001 BMW 5 Series "p0493" Questions

My service engine light went on and brought codes P0492 & P0493 . I was told it was the secondary air injection system. I brought the car in to have it checked out and they said the secondary air pump

...Air Pump and MPG Gauge Recently my service engine light came on and brought the codes P0492 & P0493. I was told it was the secondary air injection system. I then brought it in to get checked

...Air Pump and MPG Gauge Recently my service engine light came on and brought the codes P0492 & P0493. I was told it was the secondary air injection system. I then brought it in to get checked

...Do you know how many DTC'S this system can set an what they are for ? DTC P0480 DTC P0483 or P0493 DTC P0495 DTC P0526 DTC P1258 DTC P1481 DTC P1482 DTC P1484 DTC P0480 Cooling Fan Relay 1 ...