If a judgment entered against you, then at the moment you are legally responsible to pay that judgment. It is possible that you could reverse the default judgment and if you actually filed an answer and defended yourself you might, or might not, be found liable. If challenging the judgment is important to you, you should gather the paperwork from the court case and hire an attorney to review it with you.
You can reach Harkess & Salter LLC at (303) 531-5380 or info@Harkess-Salter.com. Stephen Harkess is an attorney licensed in the state and federal courts of Colorado. This answer is for general information only and does not create an attorney client relationship between Stephen Harkess or Harkess & Salter LLC and any person. You should schedule a consultation with an attorney to discuss the specifics of your legal issues.