The code indicates the O2 sensor is heating before converter activation. I tried to find the voltage specifications to it, but all I was able to find was the last two pics below for diagnostics. The first four pics are the wiring related to the sensor.
Since it is heating too early, my first thoughts are there is a short to power. Based on experience only, you should be getting Bv to the heater circuit.
Do me a favor. Disconnect the sensor. There should be a yellow wire to it. That is for the heater. See pic 1 below. Check that wire for voltage when the key is in the on position (engine off).
Let me know what you find.
See pics below.
Images (Click to enlarge)
Thursday, March 17th, 2022 AT 7:21 PM