Re: 1999 v6 accord po 420 code (smokin151)
I have 25,000 mile warranty on the cat. I took it back were it was installed and they want me to replace the 2 sensors first. That is what i am doing . They wanted me to replace the sensors with( honda) three times the price of denso. Denso is oem direct replacement. Honda uses denso brand as original equipment. I told the repair shop if changing the sensors and the 420 code comes back then the cat is bad.