Vehicle: 2014 F150 4x4 XLT 6-Speed Automatic 5.0L 112,500 miles

Aftermarket accessories:
- LED light bar mounted on the front.
- Disconnected radio (radios that farmers used; there is some red wiring underneath the center of the console directly below the SYNC face panel); Radio is no longer within the truck.

Existing conditions:
- General electrical failure for rear back up sensors (does not throw a code; cannot be seen by regular scan tools but picked up on FORSCAN): not a concern for me as I don't want to hear beeping when I back up.
- Truck does not start during cold weather easily (14 degrees F & below) without boosting/charging the battery regularly (daily).
- Lightbulb when connected to a disconnected negative cable & negative terminal turns on when the truck is off, meaning there may be phantom drain.

When it first occurred:
- March 2021, a few months after I changed the battery due to the truck not being able to start in Canadian prairie winters.

Has anyone dealt with this code? I've replaced the CMS (Bank 1 Sensor 2 HO2S) with a Ford OEM part. This didn't seem to impact the code at all.

I advised the Ford dealership in another town about it and they gave it back and said it drove fine, nothing was done except the code was cleared.

I brought it to an independent shop today and they cleared the code and drove it and told me it never came back on when they took it for a test drive. They had claimed to check the harness as well and couldn't find anything wrong with it. After, I drove it home and 1.6 miles later the check engine light is back on.

I cleared it again, drove around, the light didn't come back on. An hour later I decided to give it another shot, and 0.12 miles from my house, taking a left turn onto another street with the turn signal on, it came back on mid turn while accelerating.

Apparently, the voltage also changes when I let off the throttle.

Would the throttle body OR turn signal have any connection to the HO2S sensor?

The internet is silent, as is the Ford 2013-2014 factory service manual. Both techs from the Ford Dealership and the independent shop can't seem to find the issue either.

Any suggestions would be much appreciated.

 

Sure sounds like a grounding problem and possibly an alternator issue. I'd say get the alternator tested.

 

The alternator might have a lot to do with the battery state of charge issue, but it will not cause the DTC for the downstream O2 sensor. The rest of the provided stuff is pretty much extraneous to this fault.

DTC P0054 indicates an electrical circuit fault has been detected in the heater circuit for the downstream bank 1 sensor (B1S2 or O2S12). P0060 is the complementary code for bank 2 downstream sensor (B2S2 or O2S22). Probable cause would be defective heater element, heater circuit shorted to power or ground, heater circuit open, or internal PCM fault.

This fault will not cause drivability or performance issues, it's strictly an emissions compliance issue. If you are not subject to emissions testing, you're free to ignore the problem.

Swap the two downstream sensors and see if it moves to bank 2 (internal sensor fault) or if the fault stays in the bank 1 circuit (everything else).
Inspect involved connectors all the way back to the PCM checking for corroded or damaged pins in the B1S2 circuit. Disconnect the battery negative terminal before doing anything with the PCM connectors.
After that, it gets harder, especially if the fault is intermittent.

In order:
1. It's supposed to, that's normal.
2. No.
3. You have to look in the PCED for the diagnostic procedure, not the workshop manual (WSM).
4. If it's intermittent, the tech would literally have to catch it in the act in order to positively diagnose the fault. This could take hours of testing.... or not.