Trouble with the box

[Alex Walker]

Ok, a few weeks ago I went to take the car on a quick trip to the grocery store. As I was backing out of the drive way and beginning to turn I realized that it was taking a bit more effort to turn the wheel than I was used to. Crap, power steering is out. Unfortunately I was due back at University so I had to leave the problem for the next time I made it home. I did so this past weekend and when I turned on the car, the power steering worked just fine. No problems at all. I checked the fluid and it was at max so that rules out the pump and any leaks. Thought I was in the clear but as the car got up to temp, it started making this intermittent scratching/sucking sound and I got a CEL with P1126 and P1124. No smoke, so I'm assuming it's either a bad AOS or a tube somewhere. Then last night before I headed back to campus I was going to take the car out for a quick spin again but the power steering was out. This time I got a battery weak light as well as the ABS light.

Am I right in assuming it just needs a new battery and the AOS replaced?