i change the fuel pump already and fuel filter

Question

on my 2001 yukon xl 1500 the code P1153 and P1133 my truck starts bad when its cold out but when it warms up its fine.

Answer 1

Hi there,

These codes indicate an issue with the O2 sensors on bank 1 and 2. However, I would suggest checking the power source first as it's uncommon for both O2 sensors to fail at the same time. 

Here is some info for the O2 sensors. 

P1153 GMC - HO2S Insufficient Switching Bank 2 Sensor 1

Read more: https://www.autocodes.com/p1153_gmc.html