Oxygen Sensor Failure
 

Own a 95 Bronco, with 302, manual transmission. Oxygen sensors Left, right bank, and the one just before exhaust all failed simultaneously according to code reader. I replaced all 3 sensors to no avail. I checked the heat fuse and its ok. I haven't checked right at the connectors for power, gnd, signal wires etc etc. I got to believe there is soemthing common to all 3 sensors. TheHaynes manual is useless for troubleshooting. It doesn'tidentify the entire circuit for all 3 sensors. Anybodyhave decent schematics or perhaps a quick fix?

RE: Oxygen Sensor Failure
 

Could your code reader not be finding a PCM problum. That's all I can see the three having in common. I'll dig a little deeper and get back to you.

RE: Oxygen Sensor Failure
 

You have encountered one of the problems with code readers. Just because A code indicates a sensor issue, doesn't mean the sensor itself is bad. Depends on the code, and on Fords there are three different tests forcodes. Depending on which test the code turned up in tells you where to go for testing.

If you post the codes you came up with that will get you more help than just saying oxygen sensor codes.