# P0420 on the 1996 Dodge Ram

The bulletins listed name this code in NHTSA's summary, or are about the same components. A bulletin or a recall listed here may apply to the model year. None of it is a diagnosis.

Nobody has written a description of this code yet.

## Bulletins for this model year that name P0420

- [10018993](https://open.wenmarpro.com/bulletins/10018993), 2006-01-27: ILLUMINATED MIL AS THE RESULT OF A DIAGNOSTIC TROUBLE CODE \(DTC\) P0420 \- CATALYST EFFICIENCY, OR MAY HAVE FAILED A CALIFORNIA SMOG OR STATE I/M TEST BUT WITHOUT AN ILLUMINATED MIL, OR A RATTLING SOUND FROM THE UNDERSIDE OF THE VEHICLE. CATALYTIC CONVERTER EXTENDED WARRANTY TO REPLACE THE CATALYTIC CONVERTER. \*TT