o2 sensors not detected?

oo7thenova

Founding Member

Aug 31, 2001

342

0

0

CALIFORNIA

Sep 5, 2004

#1

• Sep 5, 2004

• #1

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

 

Rick 91GT

Mustang Master

Nov 29, 1999

9,692

95

99

PA

Sep 5, 2004

#2

• Sep 5, 2004

• #2

Check the harness with a meter to make sure you have conductivity, then you can trace it back to the EEC to see if you have a short or break somewhere.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Sep 5, 2004

#3

• Sep 5, 2004

• #3

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.

 

oo7thenova

Founding Member

Aug 31, 2001

342

0

0

CALIFORNIA

Sep 6, 2004

#4

• Sep 6, 2004

• #4

the Meter should be on the Ohms setting right?

 

Thomas302

Member

Jan 9, 2004

119

0

16

Alamogordo, NM

Sep 6, 2004

#5

• Sep 6, 2004

• #5

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.