Hey everyone, I went thru a search and could not find anything relating to it, but have any of you guys tried chemical converter cleaners like Wynns Powercharge to take care of P0420 codes? Our Wynns guy is trying to get us to use it, he says the local Subaru dealer uses it with success but I am not buying it works. I also do not believe in the snake oils that allow you to use Dexron ATF with friction modifiers. If it says the car takes Honda ATF fluid thats what I use, it has served me well for many years, any thoughts on this converter cleaning? Thank you

Bob Faestel
Technician
Northpoint Service
Milwaukee, Wisconsin, USA