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My egr pipe is cracked and I occasionally get the same code. I just clear it and it comes back in about a month. Just been putting it off for a year at least hah.
I believe that was the code I had on my 96 and it was a leaky exhaust. It was on a bend and just old age rusted through. Try to find a shop that won't insist on changing out the catalyst, just custom make a new pipe section and weld it in.
Climb under and start listening and feeling for the leak, should be easy to find. Mine was under the heat shield: