HO2S Heater Control Circuit High Bank 1 Sensor 1 code will not go away and all sensors have been replaced?

JEFF JASE

MEMBER
2013 KIA OPTIMA
4 CYL
100,089 MILES

The code

HO2S Heater Control Circuit High Bank 1 Sensor 1

I’ve replaced the sensor 3 times and this code keeps appearing no other codes appear what else could the problem be?

Tuesday, August 29th, 2023 AT 8:58 PM

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
43,072 POSTS

This is a circuit code so you may have a broken wire to the PCM. This guide can help you check, and I have included the engine and oxygen sensor wiring diagrams so you can see which wires to test and how the system works.

https://www.2carpros.com/articles/how-to-check-wiring

If the connections are good, you have a bad PCM, you can get a preprogrammed unit by searching Google or Ebay. I have included the instructions on how to change that out as well. Check out the images (below). Please let us know what you find.

Images (Click to make bigger)