large leak

FCX-ii displayed chart 15: code d8: AfterCat O2 sensor disconnection Cyl:4-6 code E6: Precat O2 sensor slow response time Cyl: 1-3 code 90: EVAP large leak detected Note: While replacing AfterCat O2 sensors I noticed oil buildup and water leakage under (I'm not too sure, but...) the engine...