1996 Saab 900 code P0410?

My check engine light is on; I went to auto zone and the code they gave me was p0410. It says it could be 1 of three things
Circuit relay defective or fuse open
Check connector and wiring
Air pump defective or hoses blocked
Is there a more likely reason of the three?
Should I start with one and work my way down?
I have to get my car inspected - it's already expired and I got ticket for it already.
PPPPPPPlease help!
Also, If anyone knows a good saab mechanic in NYC....?