spdracer@mail.utexas.edu wrote: > hasn't changed. I know the front O2 is used during part throttle, but does the > rear O2 do anything? I'd rather not have to spend money on both! Not much. If you aren't getting a MIL for it don't bother changing it. RK -- Ray Kawski 1998 Sentra SE Turbo, 1991 NX 2000, 340K mile 1991 Sentra SE-R Poconos, PA