2000 mitsubish mirage with warm up catalyst below threshold
 

just got my scanned and the only message showed up was "warm up catalyst below threshold." its service-engine-soon light is on. it got switched off and on for a couple times.
anyways ... the guy told me to replace the catalyst. but i want to make sure that really is the problem before doing any actual repairs.

i would really appreciate if someone could help me figure out what the problem is. ca "warm up catalyst below threshold" indicate any other problems? or just straight catalyst defect?

thanks! Duke