Made up a harness to measure DPR current on my 4kq. Connected it, started the car and looked at the current readings: Car fully warmed up - radiator fan cycled on and off, O2 sensor connected, at idle- DPR current fluctuates around 1.0 ma from 0.8 to 1.38 ma Same conditions w/ O2 sensor disconnected - DPR current steady at 10.25 ma.