Question

I have the P1128 code on my Hyundai. What is the meaning of the code and the best solution?

Answer 1

Hi there,

This code is for the long term fuel trim (to lean)

This can be the result of several things. Basically the computer is seeing to much air mixed with the fuel for an extended period of time. This can be due to intake manifold leaks, low fuel pressure, or a faulty mass air flow sensor. Sometimes tif it's a  cylinder engine the front O2 sensor can be the problem as well.