It seems to be a common problem for these cars. I know there is a recall for the 2009 model. I only have 39,400 miles on the car. Seems they should last longer than that.
My front end wheel bearings need replacing, how much would these cost for parts? on 2010 Chevrolet HHR
From the dealer they will be a few hundred bucks and will come with the speed sensors attached. Don't know about the aftermarket stuff. Each one will take an hour or less to change. Don't know what labor rates are where you live, but figure an hour per side.