Hi,
The code is specific to the heated oxygen sensor bank 1, sensor 2 (HO2S12). This code is set when the sensor does not warm up to the required temperature in a calibrated amount of time.
It could be caused by the sensor itself, a wiring issue, a damaged or corroded connector, a short, or an open circuit. Also, there is a technical service bulletin specific to the code which indicates the need to reprogram the PCM.
I attached the technical service bulletin below.
Let me know.
Joe
See pics below.
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Saturday, September 2nd, 2023 AT 10:19 PM