Help diagnosing a problem

[Undertaker #59]

I saw the other AWD thread on here and not sure what to make of it. I am not mechanically inclined. Here is my situation:

I have four of the same tires on my 96. I noticed recently that the front tires are showing A LOT more wear than the rear. Also, sometimes when turning, there seems to be a stutter from the front tires as one seems to grab and slip in the turn.

Is there likely a problem?
If so, what is the likely problem and
How much is it likely to cost me at the dealer?


Also, my check engine light has ALWAYS been on since I bought this car. I had the dealer look into it once or twice and replace a sensor or something (O2 maybe) and clear, but it has always come back. I don't mention this to try to get it troubleshooted, I only mention it because I do not know if there is something with the AWD system that might have added something to the code since it is always on anyway.


Thank you for any help.