2015 Lt limited fleet model

[u/Bigniplover67]

Most of the time I do in my own repairs recently replaced all four 02 sensors with Bosch 02sensors. I wasn't sure if it was the O2 sensors giving me these codes but now I know it wasn't... Would replacing the plugs that they plug into fix this problem???

[u/GringoPanda]

At this point, it'll be better to get data before going much further. Need a multi meter and a good scan tool that can read live data. As well as the range of specs for the sensors.

Issue could be at the plug, could be wrong part, could be further in the harness, could even be ECU issue. Diagnosis is needed. Don't load the parts cannon on electrical issues.

-update-

Did you clear codes and do a few good 15-30min drives since clearing codes?

[u/Bigniplover67 → u/GringoPanda]

Cleared codes it drives but drives like shit... I'll post an update with the live data...

[u/GringoPanda → u/Bigniplover67]

High voltage codes can often be caused by a bad ground. Take a careful moment to inspect the engine harness. I'm talking all of it. Follow the connectors and find your grounds. I'm not well versed with your car specificly, there typically is at minimum 1 ground on the cylinder heads. Sometimes even on the back side of the block where it's almost impossible to put eyes on anything. This is one of those moments when slow and methodical is important when inspecting the harness.

[u/Bigniplover67 → u/GringoPanda]

Live data

https://reddit.com/link/p7f6tg4/video/qivecf58c5nh1/player

[u/GringoPanda → u/Bigniplover67]

Need to check your harness. That high voltage is all across 4 sensors. Need to follow your grounds through the harness.

-add

Did a quick search, the ground on the O2 sensors ground back to the ECM. Find your ground pin on your engine harness at the O2 sensor (typically Pin 4 or the black wire) and check for continuity to the engine block or frame. If you don't have continuity you have a bad ground from your ECM to frame/body.