o2 sensors not detected?

oo7thenova

Founding Member
Aug 31, 2001
342
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CALIFORNIA
I have an 88 5.0 Mustang.


I recently converted it to mass air. I pulled some codes and got codes 41 and 91.

so i went ahead and bought new o2 sensors, because i was getting bad gas mileage.

i installed them and i reset the codes. I pulled the codes again and it still gave me codes 41-91.


can the harness be bad?

thanks
 
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also are you sure that you discharged the KAM? i generally disconnect the battery, turn on the headlights, and leave it for half an hour.

good luck.
 
There is a fusable link in the wireing harness on the passanger side of the engine bay on the fire wall, look around for it, it may be inside of some wire loom, but if its burned up, then there will be no power to your 02 sensors. I had the same problem with mine, no one could figure it out, I just happend to find it, put a new fusable link in, and the car ran great, no more codes. Hope this helps.