Code p0141

I have replaced front and back 02 sensors. Reset the light and it comes back on after 10 miles. My mechanics are both leading towards a pcm or a faulty wire. Both sensors are new oem. How can I do about fixing this issue?

 

I need to ask some questions first, what was the original complaint?

New OEM O2 sensors, from the dealer, internet or local auto parts store? I ask because the resistance on these sensors is/are important… even a 1 ohm difference can cause an issue.

Do you have a Digital Volt ohm meter(DVOM) and access to a wiring diagram for your truck?

This code is for the heater circuit for the rear O2 sensor. There are 4 wires on this sensor. If I remember correctly this connector is under the passenger seat. The red/white wire should be +12v this is the power feed for the heater circuit. Test this with a test light or DVOM. If there is power there the next step is to check the resistance across the red/white wire and its return wire to the PCM.