man, don't go buy a scanner for $80.
Get on amazon and get
THIS if you have an Android phone, or
THIS if you have an iphone.
Then, go to your Play Store (android) or App Store (iphone)
Android: buy Torque Pro for 4.95
iphone: buy DashCommand for 9.99
Total cost:
-Android: $28.94 (+ any tax you may have to pay)
-iphone: $26.98 (+ any tax...)
Now you can pull codes any time, any place. Not to mention that both of these apps have some really cool features that will allow you to monitor whatever parameters you want....get a windshield mount for your phone and go to town!