P0420 Toyota -

Question

I had a po420 code on my 2005 toyota sequoia 4.7 liter. I replaced the down stream o2 sensor, the catalytic converter and spark plugs on bank one, but the po420 code still.keeps coming back. What do I do next?

Answer 1

Hi Mike,

Generally since the code is still coming back you will need to replace the bank 1 catalytic converter. This is the driver side of the truck, the converter is the one in between the front and rear O2 sensor.