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I have a 2002 Toyota Camry 2.4l that has a p0420 code. Trying to confirm whether it’s a bad catalytic converter or not. The readings for the o2 sensors are at 2500 rpm o2s11 between .56 and .66v; o2s12 between 3.2 and 3.3v. They seem to fluctuate together. I did test the temp before and after cat and it seems to be 370 before 200 after. Thanks in advance. Brian.
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If P0420 is the only error code and cat temp output isn’t hotter than input than suspect bad cat,
Can you verify the sensor voltage readings ? If you do a quick throttle snap the precat sensor S1 should dip to around 2v than jump up to 4v before settling back to 3.2/3.3. The after cat S2 sensor should jump to .8 dip to .2 and settle back to .5/.6.
In addition verify number of O2 sensors and cats.
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