How do I determine what the exact problem is without buying all of the parts?

Question

I have a 2007 Dodge Nitro RT 4.0L with engine code P1128. How do I determine what the exact problem is without buying all of the parts? the engine will not idle and runs rough

Answer 1

Hi there,

This code points to a possible issue with the O2 sensor or map sensor. Here is some info for you.

P1128 DODGE - Closed Loop Fueling Not Achieved Bank 1
Read more: https://www.autocodes.com/p1128_dodge.html