Hey All,

i have a 97 f250 hd 5.8l e4od. My CEL light is on, and my mechanic told me it was an oxygen sensor. The truck runs perfectly normal, beyond the light i would not have known anything was wrong. Anyways i ordered the sensor on rock auto, but it was confusing as to which one i needed. The 97 f250 only has one, just before the cat. i ordered what i thought was the correct one, to find out that its not the same as the one in the truck.

The difference being the plug has tabs on it that guide into the harness connector, and they were located in different spots. They also both had different part numbers.

So... i filed the tabs down and installed it...

Did i do something stupid, or will this work. Truck runs the same, check engine light still on.

Thanks

 

I also just looked again on rock auto and cannot even find the one that came out of the truck on their catalog.
Edit:

The one that was in the truck is for an explorer according to the internet. f78f-9f472-ca. This truck is a frankenstein. Before i owned it, It originally was a manual, then converted auto, the front clip says 1992 on it, and i had another motor swapped in, which we believe is at least the second motor to be swapped into the truck. So really i don't really know where to begin haha. I guess if its running good then whatever but the cel is still on. Do i need to clear this after a repair like this or should it have gone away on its own

 

Pull the codes yourself...blindly replacing parts is dangerous to your wallet thickness. Never trust anyone who states "It's the oxygen sensor" without qualifying the answer.

Those locating tabs on the O2 connector are there for a reason. By filing them off you could burn up the computer by pulling too much current across the internal sensor component versus the heater circuit.

For reference: How To Run A Self Test

 

Thanks for the reply, i looked over your link and will be checking the codes soon(its raining right now).

BTW, the wires all line up in the same orientation the same as the old plug, there is a clip that still has to line up. But either way it is incorrect. I'm just not sure what part to get now, seeing as a 1998 explorer plug was in the truck, and this can't be right. FYI i installed motorcraft DY1094 oxygen sensor in the truck.

 

Glad to see the wires lined up. You could replace the conector with the correct one, Motorcraft WPT123. In reality you may end up finding the cause for the Check Engine Light is not from the O2 sensor so you could most likely put the Explorer version back in.

 

Ok, i ran the KOEO test, and got 2 sets of 3 single flashes, followed by a 72, an a 332. haynes manual only shows 72 for the dynamic run test which i did not do. Can anyone help me interpret these codes.

thanks rla2005, for your time.

 

The first set of codes are 111, 111 which is the System Pass Code for the Key On Engine Off (KOEO) tests.

After that there is a separator flash then the computer displays any stored codes. There is never a mix of two and three digit codes. In your case it should only be three digit codes. I suspect you mis-read the separator code as the beginning of the next code display.

Re-run the tests and stored code check. Keep in mind there is a flash between KOEO and CM codes. It takes a few tries to get the hang of it.

 

ah yes, after looking again, i get 111, 111, blink, then 172, 332.

172 - "heated oxygen sensor indicates lean condition, right side"
332 - "EGR valve opening not detected"

the o2 sensor does not make sense to me. My truck only has 1 o2 sensor just before the cat. So the right side thing has me scratching my head.

Maybe there are some opinions on this. I ussually try to figure things out on my own, but this CEL ordeal has me confused.

Thanks for any replies

 

Yes Code 172 can be a bit confusing. The code definition was written for vehicles with multiple sensors. Since you have only one (right side aka passenger side) the code is for the single sensor before the converter.

A lean code is typically a symptom, not a cause. Check the fuel pressure and verify there are no vacuum leaks in the intake or the exhaust. An exhaust leak upstream of the O2 sensor will trigger a lean code.

Code 332 could be caused by a disconnected vacuum line to the EGR valve.