Really need more information to answer your question intelligently. What year of a car are you referring to? Why would you suspect a failing catalytic converter?
Here is a somewhat generic answer: If the cat is losing its efficiency, and is not doing its job well, it may be contaminated or just worn out. If there is a restriction in the exhaust, there will be a loss of power most noticeably under heavy load and/or high RPMs. If the vehicle is 1995 or older, you can ignore the problem unless the cat is plugged or you are in an enhanced emission inspection location. If the vehicle is 1996 or newer, a failed or failing cat will generate a code in the P0420 to p0430 range.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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