P0420 Dodge -

Question

WE HAVE REPLACED THE CATALYTIC CONVERTER AND BOTH O2 SENSORS ON A 2009 DODGE GRAND CARAVAN. THE CHECK ENGINE LIGHT GOES OUT FOR FEW WEEKS AND THEN IT COMES ON AGAIN. ANY IDEAS?

Answer 1

Hi there,

There are a number of possible causes for this code. Here is a list for you.

P0420 DODGE - Catalyst System Efficiency Bank 1

Read more: https://www.autocodes.com/p0420_dodge.html