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Do you think there is any change in readings with a wideband sniffer when you have changed the cats or remove them.
All of the widebands available for our cars always tells you to install the sensor before the cats.
 

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The function of the Catalytic Converter is to catalyze, complete the combustion process on unburned hyrdocarbons and monoxides. To do this, it scavenges oxygen from the exhaust gases. Since the function of an O2 sensor is to measure that oxygen, putting the sensor after the converter causes you to measure the efficiency of the converter, not the AFR of the engine.

If you put the sensor in front of the converter, it doesn't see the converter downstream except maybe for the effect the restriction has on back pressure and velocity. I doubt these factors would appreciably affect the accuracy of a wide band sensor, so my answer would be "no".
 
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