Q: Check Engine light is on

asked by on February 09, 2017

Was told that the Catalytic Converter needed to be replaced with 02 Rear Sensor because the Sensor can not be installed without replacing the Catalytic Converter.
My question is why can't the Rear 02 Sensor be replaced without replacing the Catalytic Converter

My car has 86600 miles.
My car has an automatic transmission.

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