Code P0420?

Hi,

A P0420 indicates the catalytic converter is operating below threshold. In most cases, the converter needs to be replaced.

What you could do is this. Using an infrared thermometer, check the catalytic converter intake temperature and compare it to the outlet temperature.

If the converter is working properly, the outlet will be hotter. Take a look through this link, it explains what I suggested in more detail and other things to check:

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

Let me know if this helps or if you have other questions. Note: If there is an oxygen sensor that is failing, there would be a code specific to the sensor.

Let me know.

Joe

Thanks Joe. I ordered a temp gun and then the check engine light went away. :) I'll watch it and see what happens.

Thanks for the update. It sounds like you have the same luck as I do. LOL

Regardless, let me know if things change or if I can help in any way.

Take care,

JOe