I own a 2000 E320 and the engine light has been on for a few weeks. During that time the car was scan tested for codes and although some have been identified and cleared the engine light is still on. The codes cleared are (1) P0410 secondary air injection malfunction (2) P0400 EGR malfunction (3) C1504-019 steering angle sensor fault.
I spent a lot of money so far and I’m told a third scanner will be required to identify and fix the problem and it will cost me $1,000/$1,500.
Has anyone had the same problem? (2) Any suggestions? And (3) is it safe to drive the car? the engine light is still on but there is no mulf****ion shown on the panel. Thanks.

Jalen