2001RamWayne
Junior Member
I currently have a 2001 Ram 2500 SLT Larime. Its original motor was 5.9L v8. Motor and transmission was no good so I swapped in my 5.9L v8 from my 99 ram 2500 base model. Same motor, trans, rearend just with no bells or whistles. I had to cut and splice the injector plugs from my 99 to my 01, and change the computer. Now it runs great except when you come to a stop or at idle after driving. It's throwing codes for high voltage to O2 sensors and O2 sensor heater? I thought the cat was clogged so I cut it out. Still has O2 sensors but same issues. I'm at a loss on what to do. I changed the throttle body, all new gaskets, filters, fluids, seals, plugs, wires, cap & rotor. Even tried the high dollar gas and fuel treatment. What could be wrong still?