Hi,
So this morning on my way to school, which is about a 25 mile trip, my check engine light came on. Jeep was running fine no issues, at least that I could tell. Once I got to school I checked the computer codes and I got codes 12,31,55.
So this is where I am now, any help would be greatly appreciated.
Thanks in advanced.

 

Look them up here on the forum they are all listed.

 

Ignore the 12 and 55, they are normal. 31 is an evap system leak.