Cat issues P0420

[Cezar]

Already replaced the sensor with Denso unit.

I found a bypass wiring diagram for the 3rd gen using a resistor and matching cap. Does this work? It looks like it almost certainly would. In my research the only concern I found is a mention that Toyota was using wideband O2 sensors and a bypass would throw off a calibration routine. This sounds plausible but unlikely. Thoughts?

 

[duffdog]

Already replaced the sensor with Denso unit.

I found a bypass wiring diagram for the 3rd gen using a resistor and matching cap. Does this work? It looks like it almost certainly would. In my research the only concern I found is a mention that Toyota was using wideband O2 sensors and a bypass would throw off a calibration routine. This sounds plausible but unlikely. Thoughts?

Doesn't work on the 4runner. the computer is aware of potential bypasses and checks by sending current spikes to the sensor to verify if the signal has been conditioned. What does work are spacers on the o2 sensor or buying one of the mini-cats that I manufacture.