[Benziel_ace]

Hi, my 2005 kia rio with about 110k miles on it was diagnosed with a p0420 error code. I've read a lot on the forums about faulty 02 sensors on our rios, what are the chances that this could be the root of the problem?

 

[ronjohn]

Change the O2 sensor and see where it goes maybe you'll get lucky

 

[Kevster]

Hope it is the O2 sensor.....otherwise start saving your money for a new cat. 130K seems to be the point they all go..... And you're almost there.

 

[ronjohn]

Amen kevster, I was trying to be positive, Hopefully it's not a cat problem save up some money like kevster say's if it is. They aren't cheap. Reguards Ronjohn