p0420 p0430?

[sempersteelers_43]

On 11/10/2018 at 8:02 PM, swathdiver said:

You cannot always hear a bad cat, they don't all fall apart and rattle around.  Yes, you would be down on power some but could you feel it?  I couldn't, even raced my truck at the track and still ran decent times.  Besides the code popping up, the only other tell-tale signs were the drop in gas mileage and watching O2 sensors on Tech2..

Mine are bad and I have not noticed any significant side effects from it yet. Still get about 14 mpg average and I still drive like a race car most of the time. The only reason I know it is the CAT is because of the repeated code.