2001 Discovery II with 88,500 miles. SES light came on two days ago. Was in for servicing less than two months ago. Per my OBD, I have the following codes:

P0133
P1412
P0420
P1415

Any input on what problem(s) these four codes indicate?

 

exhaust, 02 sensor, and secondary air injection (not in that order)
I'd check for exhaust leaks and make sure all hoses are good with no leaks at the sai pump