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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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