2009 Grand Caravan P1129

Question

I am constantly getting an egine code P1129. I replace the upstream o2 sensor....works for 3,4 9 months and then it happens again.

Answer 1

Hi there,

Here is a list of possible causes for this code.

P1129 DODGE - Closed Loop Fueling Not Achieved Bank 2

Read more: https://www.autocodes.com/p1129_dodge.html