Toyota Repair: 2000 Toyota Celica, toyota celica, o2 sensors

Question
Hi Ted!  I have a 2000 Celica GT with 82,000 miles.  My check engine/Malfunction lamp came on. I took the car in for the test and turns out I need both of my O2 sensors replaced as well as my CAT. Why do I need to replace everything so soon?  I take excellent care of my car and follow the maintenance schedule.  Please give me some advice.

Answer
Did you take it to a toyota dealer?
Did you ask them why the cat and the sensors have to be replaced and what was their response?
I can't be of any help unless I can have the trouble codes that were retreived fom the on board computer, can you give me those?