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i was looking at getting one of the URD Rear Oxygen Sensor simulators. Do i still need the the O2 sensor clostest to the motor, or do i only need the rear O2 sensor.
 

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yes you do still need the front one.

the computer compares the two reading to see if the cat is doing it's job, if the cat is still installed then you should get a new one or hollow it out (whatever your ethics let you do). then the simulator tricks the comp into thinking the cat is functioning properly if it is not :2cents:
 

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You still need BOTH sensors!

You should not remove the rear o2 sensor. The o2 simulator does not replace the o2 sensor - it only modifies the signal coming from the sensor.

i.e. even if the rear sensor goes bad, it won't matter, but you still need the sensor to be there. PLUS - if you ever have a visual inspection of your emissions system, it will be obviously (and illegal) that your missing an o2 sensor.
 
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