O2 sensors

[mht95ranger]

Ok guys, I have a problem with my truck again. I have cel and pulled the codes. 135 141 155. I know that the are the o2 sensors heat circuit faults but what is the chance all 3 o2 sensors went bad? Looked on line and found that newer rangers had a fuse for the heated o2's. Can't find anything like that for my 95??
Anyone have any ideas for me to check? Once it warms up a little I will climb under there and look at the harness.

Thanks for the help, David

 

[LEVE]

You're correct thinking all three 02 sensors don't go bad at once. Just out of curiosity:

• Has the MPG drastically changed?
• Does the Ranger belch black smoke?
• Is there a velvety black residue around the inside of the tailpipe?
• Have you put a voltmeter on any of the 02 senors to see what they're reading?

 

[mht95ranger]

Mileage has not been good but I thought it was because of the snow and use of 4x4.
No black smoke
a lot of stuff in the tailpipe
not yet on the volt meter again because of the snow. What am I looking for with the volt meter?

 

[mht95ranger]

bump