Which convertor - code P0420

[lady]

SES light on with code P0420. 2001 frontier 4 cylinder, 90,000 miles. If it is a bad convertor, would it be the one that is between the oxygen sensors or the one behind the second oxygen sensor? I downloaded the engine control manual and it only shows the "three way catalyst" that is located after the second oxygen sensor. Thanks in advance.

[mpe235]

The one between the sensors.

[lady]

Thanks mpe235. Other than the SES light being on, everything else seems fine. In your experience, is the convertor the most common thing that causes code P0420?

[mpe235]

Originally Posted by lady

Thanks mpe235. Other than the SES light being on, everything else seems fine. In your experience, is the convertor the most common thing that causes code P0420?

Usually if you have a P0420 code it is the convertor.

[lady]

Thanks. I am a do it yourselfer whenever possible. It does not appear to be that difficult to replace.