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I just replaced the transmission on my 2004 Taurus SES DOHC (with 215K miles) and since then, I am getting a P2197 code. I checked for intake leaks (none found), replaced the EGR gaskets and fuel filter but the code still coming back. There are no other codes present other than the P2197 and the engine is running smooth. My question is, could a leak in the exhaust (disconnected system by the cats when working in the tranni replacement) cause this code?