This scanner is $86 and does most abs ,airbag and engine codes.
http://www.amazon.com/gp/product/B00...ce-full-site=1
Sounds like a wheel bearing if your getting tire pressure warning. Wouldn't think tire pressure is tied to abs module just the wheel bearings. If its a wheel bearing bad and you replace it the abs light will go off immediately.
Best way is read the codes!