I just bought my 92 Bronco with 113,000 miles. The very first day the "Check Engine" light came on. Back to the "used car" dealer it went.
They decoded the fault as this:
The computer (on the bronco) is looking for TWO O2 sensors. The only o2 sensor on the truck is working fine.(Like I said there is only one) At least thats what they say(they unplugged it and the engine put out another "rich" code so they assumed the sensor was working. My question is this: Could this be a "computer" problem? or a bad O2 sensor or what?
They told me to contact a local ford dealer to find out if there was a "recall" on this problem
Please help us figure this out because they are trying to find out the cause also!
The light comes on "once in a while" say every 15-30 miles -.
It will stay on for a few miles then goes off. The first time it came on was when I booted it in the ass to test the responce of the 5.0. But it comes on and goes off when it feels like it.
The trucks seems to run fine. But I want to know why it is coming on.
The Bronco's only have one CO2 sensor, and it is in a section that connects the two lenghts of the Y-pipe into one. That is so the CO2 sensor can read from both sides of the engine at one. I would think that it was just another shortcut by ford to aviod having to put two on the Broncos.
Anyway, the CO2 sensor can be bought a almost any automotive parts store for about $45.00. I would say get one and see what happens. It is a part that the ECC demands on having, so a new one could't hurt in replacing.
If you still get the code, then you may want to have somewhere check the codes again, and when they do make sure they clear all codes from the ECC memory.
If the technician said the 02 is bad, why dont you believe him??? Your making the problem too big, it needs to be replaced...O2 sensers are a replacement item just like plugs,wires, etc,,The computer relies on its sensors, so if one is bad, its in open loop, which causes a rich mixture...kick down the $50, replace it...The shop will then have to erase the code with their computer....chad
It would be nice to know what codes they are getting. Common problem areas have been : hego sensor, fuel pressure regulator, and battery acid getting into hego wires which run along the positive cable to the starter on some models. Ford Tech.