My first indication my cat was plugged was when i dropped out to pass on a two lane road and could not get over 3K rpms when it kicked down. Luckily I was able to duck back in. Then it got to where it wouldnt climb a hill without losing speed. If I stayed on it, valves rattled, misfired, and heat climbed. What happened wass the pressure that is supposed to go out the tail pipe was backing up through the valves into the intake, causing low vacuum. A true phenomenon.
All the rear sensor does is monitor the cat. If it is sending slightly incorrect correct signal, the PCM throws the cat code. It is entirely possible that it is lazy and not throwing a code specific to the sensor. If you get a sensor, get an NTK.
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