This whole thing started in 2020 when the cat was stolen. After it got fixed, P0134 would some times occur ( Soft Code). A basic scanner only show 1 code and high end scanner gave me a code for the ELD/ Electrical Load Detector.
The new LED took the P0134 and kept it off for 2-3 days long enough to pass emission test. The car has no drive ability issues at all.

The CODE P0134 has return as a hard code, the soonest you start the car bingo!

AFR Sensor UNPLUG 1. Red Wire 2.13 volts 2. Yellow wire= 1.84 volts 3. White wire 12.33 volts/ battery voltage 4. Green wire 2.78 volts but Does Not Light up an LED test light.

AFR Sensor Plug-In 1. Red Wire 0.0013 2. Yellow wire= 1.84 volts 3. White wire 12.33 volts/ battery voltage 4. Green wire 12.33

I think the problem is on the GREEN Wire w/ 2.78 Volts; I think it should be close to zero w/ the sensor unplug.

 

Today, I did some more digging and found some interesting results.

AFR unplug, Heater+= 12.5 volts Heater / ground - = 2.47 volts

Removed AFR Relay Heater + = 0.00 volts Heater/ ground - = 0.00 volts

The current from the hot side of the heater is making it to the ground cable some where.

 

Hello, did you have any luck fixing the issue? I've put new sensors in, cleared the code and it still pops up after idling for about 2 minutes!

 

I have not bother fixing it, winter is been real crappy cold so I just drive it.

In the above post, I posted the current readings at the sensor. The ground side is where I think the problem is.
2 other things that can affect the AFR are exhaust leaks and valves getting tight which is common on the 2.4L engine.

 

What brand of sensors are you using? Pretty common to get DTC’s with anything other than the Denso sensors

 

Denso sensors