Oxygen sensors going bad?

[illadvised]

What is a good way of checking on my cats? My car is very high milage and I am sure they will go out eventually

I was thinking of pulling an o2 sensor and using a borescope camera?

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[engineermike]

And turning off FAOSC fixed it?

Yes, but….
1. Some tuners and even software don’t allow for turning of FAOSC
2. Cat monitor will perpetually stay “not ready”, and I believe o2 sensor test as well.
3. No wideband calibration.

 

[engineermike]

What is a good way of checking on my cats? My car is very high milage and I am sure they will go out eventually

I was thinking of pulling an o2 sensor and using a borescope camera?

You can pull the passenger's side pretty easily and visually check the brick. I’ve done a borescope on the drivers side and it worked ok. But really you should log wbo2 and rear o2 volts until you observe a cat test cycle. If the rear o2 voltage cycles with the wbo2 then they are done.

 

[junits15]

What is a good way of checking on my cats? My car is very high milage and I am sure they will go out eventually

I was thinking of pulling an o2 sensor and using a borescope camera?

https://www.mustang6g.com/forums/th...ng-junits15s-street-build.188559/post-3841176


That’s me doing the test and observing a failed cat. You need to log all 4 o2 sensor voltages at the same time.

At some point during a drive, usually on the highway at steady state cruise, the ECM will toggle the mixture rich and then lean over and over. You’ll see it in the upstream sensors but you shouldn’t see it in the downstream sensors at all.

The cat should act like a low pass filter and prevent those fast changes from making it through.

 

[djcodeman]

good discussion here peeps. I finally got my o2 sensor in the mail and swapped it out last night. It's been raining so haven't had a chance to drive the car yet, but I reset the code and revved a few times, and it hasn't come back.

 

[K4fxd]

Yes, but….
1. Some tuners and even software don’t allow for turning of FAOSC
2. Cat monitor will perpetually stay “not ready”, and I believe o2 sensor test as well.
3. No wideband calibration.

1. Some do
2. In no testing areas this is not a concern
3. I do believe the widebands calibrate off air through the wire harness. This is why you need extension harnesses instead of being able to cut and splice in extra wire.

I do like to keep cats if possible just to be a good steward. I don't like following cars without them.

 

[junits15]

I do like to keep cats if possible just to be a good steward. I don't like following cars without them.

Same here, hate being behind a smelly car, so I don't want to be a smelly car.

 

[junits15]

good discussion here peeps. I finally got my o2 sensor in the mail and swapped it out last night. It's been raining so haven't had a chance to drive the car yet, but I reset the code and revved a few times, and it hasn't come back.

That top one looks like there could be an issue where the wires go into the sensor, is it just bent weird?

 

[Ruiner46]

That top one looks like there could be an issue where the wires go into the sensor, is it just bent weird?

Good call. Is it just my eyes or does it look like the metal part just behind the hex where you put a wrench is also bent on the old sensor? Maybe it got smacked by something?

 

[djcodeman]

Good call. Is it just my eyes or does it look like the metal part just behind the hex where you put a wrench is also bent on the old sensor? Maybe it got smacked by something?

Either way the burnt one is gone and the clean new one on the bottom took its place

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