Quote:
Originally Posted by RCZ
I think some of your guys are misinterpreting Stillen, this is why he edited to add that they specifically affect CEL. The rear only checks for cat deficiency. The fronts control fuel under load, aka when it matters. You can drive the car with the rear o2 sensors completely unplugged and it wont affect anything. Its the CEL's that you have to worry about if you don't like lights on the dash like me.
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Right, he was responding to my comment about O2 sims. While the rears are only for emissions purposes (CEL), they can't be fooled with simple sims, because the ECU is actually looking for them to respond to small changes in fuel delivery. Killing the rear O2 without a CEL would require either a very advanced O2 sim/replacement that bases its outputs on what the car is actually doing (doesn't exist), or reflashing the ECU to ignore them.