ORIGINAL: cliffyk

The PCM monitors both rear sensors and expects them to delivery a signal that is switching, lower in amplitude, and out of phase with the signal from the corresponding frontsensor.Without cats th rear signal would normally be very much the same as the front signal, which tells the PCM that the cats have failed.[/align][/align]MIL eliminators are a simple single pole resistor/capacitor filter that modifies the rear signal to look sort of like what it would look like if working catalytic converters were in place.The computer will eventually throw a DTC with only one rear sensor connected, although this can take as much as 300 to 400 miles of driving before it happens.[/align][/align]Turning off the rear sensors requires that a modified, custom, tune be loaded into the PCM. This generallymeans that you will need the same tuner or tuning system to make any further modifications to the tune, or reload the stock tune--or bring the car to a dealer or fully equipped tuning shop and pay them some big bucks to force a reload of a stock tune.[/align][/align][/align]

ORIGINAL: tbirdscwd

I know you use Sniper, so do I, But the Rear 02s can be turned off by almost all handhelds and the stock tune can be flashed back to the PCM in just a few minutes. You can also just load a factory tune thats been modified not to read the MILs.