P0420 sion tc -

Question

On a 2006 Sion TC I have code # P0420 would this be a common cat problem on a car with 150K? upstream and down stream O2 sensors were changed 5000 mi. ago. P0420 comes back. Can anyone help me? It's inspection time. always happens that way don't it?

Answer 1

Hi there,

Since both O2 sensors have been replaced then it's a safe bet that you need a new catalytic converter on this to resolve the issue and get you through your inspection.