Post by
VStar650CL »
https://forums.nicoclub.com/vstar650cl-u299034.html
Wed Oct 02, 2024 10:59 am
I'm not sure what you mean here. The rear HO2S should screw into a bung in either the south end of the cat or the intermediate pipe directly south of the cat (I don't recall which on a D21). If someone eliminated the rear sensor, the bung may be plugged or absent. The sensor has a pigtail and connector on it as an assembly which interfaces with the truck harness.