Get the emissions test from the seller, definitely. I suspect it's unlikely it actually needs a cat but the e-test will tell you for sure one way or the other. Like I said, our Taco threw this code early on and it passed the e-test I got when I sold it by the fast track criteria, it was super clean. It was either the octane thing I think since I didn't do much else other than drive it, changed the air filter, change the oil.
'91 Pickup - Imelda
'08 Tacoma TRD - Donna
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein