Airbag light, track light, vsc off, vsctrac, cel

Hey guys, my names Aaron. First post. I'm a technician, so I won't have an issue diagnosing. I'm just at a loss at this point. New to the site. My truck was in a front end collision 2 owners ago. So the engine was replaced. The engine only has 80k on it. I bought the tuck from my bestfriend 2 months ago. I was aware of the electrical it has. Now, to the point. Cel is on for both upper O2 sensors. Anybody had any issues with specific aftermarket air fuel ratio sensors (upstream). With my dealership discount they still wanted $150 a piece. I'd rather find em aftermarket. I'm assuming that's unrelated to the electrical issue just thought I'd throw it in there. The truck randomly throws the airbag light for a steering angle sensor code. Sometimes it'll stay on sometimes it'll stay off. The sas was replaced by my buddy he bought it through the dealership. When it comes on my dome light and map lights quit working. The trac light, vsc off light, and vsctrac light always stay on. Also, my tac always resets my trip mileage every time the airbag light comes on and the clock cuts out. It has aftermarket headlights that I wired, aftermarket radio, and a 3" lift. I've found a connector behind the climate control assembly not connected anything. Figured it was for the stock radio, may or may not be involved. Don't have a clue. I'm stumped. It all may be related or it all could be seperate issues. Advice is much needed. Thanks appreciate everyone's time in advance.