o2 harness, where to ground? January 12, 2006, 04:30:18 PM was messing around in the engine compartment, the drivers o2 was not hooked up and the harness is not grounded. where should it be grounded to? Quote Selected
o2 harness, where to ground? Reply #1 – January 12, 2006, 05:20:16 PM I believe they're grounded on the rear of the head normally. Quote Selected