my 2005 Silverado needs new wheel bearings... or so I am told.

My ABS light has come on within a month and a half of installing a suspension lift.

The computer at my friends shop gave me a code for the front sensor.

How do I find out if the sensors have just gone bad or if I do in fact need new wheel bearings.

Also what are a good affordable set of wheel bearings to buy if I end up needing some.

Thanks dudes