Car/mods in my signature. No vacuum leaks that I can find, had no codes before installing headers. The first few trips after installing them (about 50 miles) I generated a p0131 code and a p0140 code. My rear o2 sensor was not plugged in and the headers were plugged, so no surprise there. My front o2 was installed with a ZZP extension harness (no way the connectors would reach with stock wiring). After a few more trips, however, the p0131 code went away, and now I'm getting a p0171 code. I'm guessing that the front o2 died. Opinions?
