code p0420

been searching/reading but find nothing like what I have now. My scan reader now shows p0420 bank 1 pnd mod 10 1/1. What I do not know and been searching for is pnd mod 10 1/1. For ref. I just replace o2 bank1 sensor 2 on my sienna. pnd mod 10 1/1 did not show before I replace o2 sensor and drove for 364 miles. Hope someone can help me out. Thanks in advance.

 

anybody?

 

https://www.tacomaworld.com/search/7285410/?q=0420&o=date&c[title_only]=1

 

pnd mod 10 1/1 could just be some generic coding from the code reader you are using. Never seen anything like that before. Go to autozone and see what they pull up on there reader to make sure.