Really sorry for the late reply, but I was called out of town unexpectedly...
My diagram shows a connector near the O2 sensor with a yellow wire in it. In my diagram it says it's for an automatic transmission only. I wouldn't worry about it (unless you have an Auto).
EDIT: it's a connector for the Lock-up Control Solenoid Valve on the automatic transmission.
Last edited by kd5dbl; 06-10-2006 at 11:45 PM.