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Originally Posted by blazes9395
Also if I may add a little more, you don't need to replace the 02 sensor behind/after the cat unless of course that sensor is causing the SES light to come on. This sensor does nothing for fuel management and only is put there to monitor the efficiency of the convector itself. You only need to replace the sensors before the convector.
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While not as crucial as the precat sensors, the postcat sensor can have an effect on fuel management. To determine the converter efficiency, the PCM monitors the post cat sensor and compares that to the Bank 1 sensor. If it doesn't see activity within the right range from that sensor, it will adjust the fuel trim so that it can monitor the efficiency.