2001 Mustang Bullitt GT problem

I got in her today and replaced the air filter and took it for a drive. As soon as I get going I notice that the speedo isn't working. Later the odometer goes blank and it gives me a check engine soon light, and the traction control button stays lit. It get it back home and take the negative side of the battery off for a couple min and the odometer comes back and the check engine light goes away, but the speedo still doesnt work. All that I have done to her recently is change the steering wheel (maybe a connection that I missed??) and changed the air filter. The battery has been dead for a couple weeks (my son left the passenger side door open without me knowing). I have had to jump it a couple times and today was the first time I was able to drive it and try and recharge it.

Any idea what is going on?
 
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