P1161 after alternator replacement.
 

Hey guys I just got my alternator replaced as it seized the other day while I was driving. I replaced it 2 times with used ones and finally I was like f this I'm putting a new one (was trying to save money but the used ones were no good)
Anyway I picked up the car today from the shop and everything is working great. Good voltage read and all. But my engine light came on.
I checked the codes and I got p1161. Wondering if it's a loose vacuum line or what. What/where should I check?