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Discussion Starter #1
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
 

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1997 Thunderbird 4.6, 1998 Mark VIII LSC
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9,576 Posts
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.
 

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Discussion Starter #3
Ok I see
They are the only codes coming up
And thinking that’s causing the bad stumble won’t really rev up.
Looks like drivers side is easier to do ha
 
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