Quote:
Originally Posted by Russell James
Maybe you got another bad O2 sensor.
You could try swapping them side to side.
I believe P0161 is the heating element current fault.
"The ECM detects that the HO2S 2 heater current is greater than 2.9 amps, or less than 0.3 amps for greater than 8 seconds."
Grabbed that from a GM manual.
So somehow the current flow is out of whack on that circuit. See if your scan tool can read that heater element circuit in amps. Wiggle the connections while watching the amps. Make sure the male pins and female side of the connectors look good, put in some dielectric grease into all the cavities.
Beyond that, will need a service manual wiring diag view to see what terminal out of the ECM is that heater element output. Then check for batt voltage at that output terminal.
If there is no batt output at the ECM pin, bad ECM. Good batt voltage there, problem in the wiring or sensor itself.
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I would not use Dielectric grease in that circumstance. Dielectric grease is non-conductive. It would be fine on the rubber boot to keep the water out, but stay away from the terminals. Use a conductive grease on terminals.