Theoretically you can just fix the head gasket but my experience after doing that was that it
just happened again. After putting in a rebuilt junkyard engine I put 100,000 miles on it with
no further issues. That was with a 2003 you may have a Dexcool problem with the 2001. I
think you can read online about the antifreeze destroying head gaskets. I haven't had a
awd car but I did have problems with it turning the abs off. Turns out there is a problem
with shorts in the wiring harness (about a $50 part). Replacing it solved my problem. You
probably should be proactive and do both sides. Do not let your mechanic tell you it is the
hub (a $250 job) without trying the harness first. I will warn you that may be a tough sell
but it also could have been I had trouble because I am female.Ca n't help you with the gas
gauge other than suggesting resetting the odometer every fill up and using the DIC to tell
you your mpg. I am on my 4th Aztek in 17 years. I love them but I've learned a lot about
their quirks. I just searched high and low to find my 4th one and, if I were you, I'd try to find
an '05! I think most of the problems were ironed out by then. I put 235,000 on my last '05
without a problem. Hope this helps!\