I'll disagree with Monkey Boy. I've had 2 sets of MIL Eliminators. The first set for over a year with no problems. Turning the rear O2's off with a handheld tuner is not always a good way to do it. If your area requires an OBD system scan for inspection, the car will have 2 unset readiness codes with the rear O2's turned off. That may be enough to fail the car. So the obvious answer would be to turn them back on right, NO. Because when you go drive the car to set those readiness codes, you'll most likely get a MIL on, which when you use the tuner to turn it off, you'll get 5 unset readiness codes. Just get a set of MIL Eliminators. I've been through all that and it's a HUGE hassle.