No, it does not mean you will have engine failure. Your engine will be just fine. The definition of that code is, "Catalyst system efficiency below threshold on bank 1".
Meaning, you have two oxygen sensors in your car, one before the catalytic converter and one after. The problem will probably be between the two. Notably that the catalytic converter isn't burning off the extra hydrocarbons like it's supposed to and thus keeping emissions down.
Your catalytic converter could be bad, could have a hole in it, or one/both of the oxygen sensors could be reading the exhuast stream wrongly.
There is a mazda guy here who is pretty good. He could tell you if what you have is a common problem for your type of car or not. I hope this helps.
Monday, March 5th, 2007 AT 10:49 AM