catalyst effiecency

The code I was looking for was 72 = means catalyst effiecency below level. Now i need to know what that means and how can I take care of it? Thank you in advance!!!

Is the engine running well? If it is then you may have a burned out catalytic convertor. How does the exhaust smell? How many kms since both O2 sensors replaced?

Engine runs fine...No change in smell of exhaust...I dont think I eve changed a O2 sensor because I dont even know where it is.....Do you think this is serious? Thanks for your reply

Here's the possible causes reight from Chrysler:
- Catalytic convertor failure
- Exhaust leak upstream of convertor
- Conaminated fuel
- Mechanical Engine problem

Also if only 1 sensor was ever replaced, it may set off this code. Always replace both at same time. Ebgine mechanical problem means oil burning. If that's the case the engine has clogged the convertor with oil deposits. Fix engine and replace convertor. The only way I can see this is if it's a 3.0. As to the seriousnes of this code it's going to effect your fuel economy quite a bit.

Thanks will check on it