I got an SES light after about 45 min of driving after we installed the headers and had it reset, since I had o2 sims in the rear and everything should have been fine. Anyway, after about 10 more hours of driving I got another light. This time I got three codes:
P0115 is Upstream Heated Oxygen Sensor circuit fault - Bank No. 2, and P1153 twice. I can't find the second code on the list I have, and I did a search with no luck, does anyone know what this is. I assume I need a new o2 sensor on the passenger side (front), but I'm not sure what needs to be done about the other code. Any help would be appreciated.

 

Maybe when you spliced into the wires on the front o2 sensors to do your home made extensions, something wasnt put together correctly, or isnt getting a good connection. Just my opinion.

 

try this:

http://www.gearchatter.com/viewtopic9335.php

sounds like a new sensor is in order