Been reading a lot of o2 topics here
And if I’m reading right just change front banks
Backs don’t do much
My scanner says
O2 sensor heater circuit bank 2=sensor 1
O2 sensor heater circuit bank 2 sensor 2
No cel. But it stumbles bad ,idles fine
95 cougar 4.6
Thanks
It's a little hard to decipher exactly what it is you're looking for. Let me know if I get it right.
You have heater circuit malfunctions on both driver's side O2 sensors.
You are correct - the bulk of the work is done by the front O2s. The rears help the PCM ensure catalyst efficiency is within tolerance and also help serve as a "reality check" for the front O2 readings.
You can help determine if it's a sensor or other problem by swapping left and right side, clear the PCM, then see if the codes reappear and if they follow the sensors, or the wiring. It's possible it's a wiring issue but the front O2s and rear O2s don't go through the same harness to the PCM.
Could also have a bad cat. But try swapping the o2s first.
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