I wàs getting heater high circuit an heater low circuit for 4 o2 sensor an fuel closed loop an random cylinder misfire.so from research I seen I need to change sparkplugs an coil packs an I still had sales error an it was smelling like gas bad an the engine would revie high rpm an the run rough an stall oh yeah it's on my 2006 Chrysler 300c 5.7 hemi an then I ordered all 4 new o2 sensor upstream/downstream ran my vin an the was on ebay I know now I shouldn't have bought from ebay an should have got mopar but I didn't know so when I got them the cam with 18inch connection cable I didn't know how to tell apart until I took off old ones so I ended up just changing them anyway an it ran good for a day then warning ⚠️ lights came back but only codes I get now are heater high circuit for all for an I only change 1/1 1/2 an 2/2 I couldn't get a angle to turn my 90% socket but justanswer. Com told me to check power with key off to conecters an I got . 07 .05 .06 so they said I'm getting a short to ground can only get my fingers on the conecters to 2 sensors so I can't see the wire with out cutting into the main engine wire harness so I called mobile mechanic with good reviews an he told me over phone that since I told him it don't start giving me problem on cold cool nights only when it runs for a while or it's already hot outside an he said my catylic converters probably bad an I need to straight pipe it but when I look at straight pipe exhaust none come with anything past my o2 sensor so the start before catylic converter so I don't know how that would do anything to fix my problem only thing I can find information on is to fouler spark plugs 18mm an drill on out an kinda just hold my o2 sensor out the exhaust to try an bypass it I guess any help please.
I tried to add screenshot of error codes but I can't find where to add picture
Using aftermarket O2 sensors is never a good idea and that may be your problem.
Anyway, on yours the O2 sensor heaters are controlled on the Power side by the PCM so I don't know how the voltage to the heaters can be tested with the Key OFF.
Yours are behaving like all 4 either have an OPEN in the Power side wiring, are missing their Grounds, or have burned out heaters (Open circuit).
You can grab a multimeter, unplug each O2 sensor connector and check the resistance between the Power and Ground side of those O2 sensor heater wires (O2 sensor side).
You can also backpin the two heater wires (O2 sensor connected to the harness) and use a test light to check the wiring integrity and to see if the PCM is controlling the heaters.
I found a video of Eric O testing the heater circuit of an AFR sensor. Notice he isn't using a store bought test light. He's using a lamp and socket from what looks like a car's side marker light. He's putting around a 1/4 amp load on the circuit.
Also, notice that the PCM uses PWM (Pulse Width Modulated) voltage to control the O2 sensor heaters.
At first the light is illuminated, then it flickers, then turns off. He explains why that is.
If you looked at the voltage signal on a scope it would look like this during PWM control of the O2 sensor heaters:
The Yellow trace is Power. See how the PCM quickly Cycles the Voltage to the heater Power side from 0 volts to around 14 volts (battery voltage).
The (flat) Green trace is the Ground.
Lastly. the reason I say that your 2006 Chrysler 300 has Power Side controlled O2 sensors is because the wiring diagram shows it does. I labeled the O2 sensor 1/1 but all 4 are wired the same way.
So maybe watch the video and see if it helps you diagnose the problem.
https://www.youtube.com/watch?v=GAQEXmIoKcQ
