I have a 2008 Dodge pick up that I must say I've been happy with with the exception of this one problem that unfortunately has me puzzled. It sometimes doesn't engage in 4 wheel drive and given the fact I live here in the Northeast and 4 wheel is an essential tool during the winter months. I brought it to the dealership on monday before our blizzard and they told me it was a wheel speed sensor and thats why it won't engage. I have searched the internet hoping to find the answers and possible causes for this before i spend all kinds of money on parts Any help would be greatly appreciated with this