Driving throught WV the drivers side cat came off the truck and once I got to where I was going I was able to examine the pipe some more and there was a sensor on it. I thought it was an O2 sensor but there's already one of those on the manifold. Anyone have a diagram they can share that shows where this sensor goes? It's 4 wires that goes somewhere.

I think I can ignore it as the replacement cat doesn't have it on there and TN is lax in their emission laws.

-Matt

 

Every truck has 4 Ox sensors.
Look at the harness and you will find either a plug or leads that was on the rear sensor.
Without it you will have a code set telling you the circuit is open because it's missing.
The sensors are located in/on the rear cat body. Look at the other side.
It is there on each bank to monitor the health of the both cats ahead of it.
Good luck.

 

I thought so but wasn't sure - is there any way to trick the computer into seeing a good sensor? I had to cut the wires to it to remove the cat since the bolt that holds the sensor in was rusted to the pipe. What if I tied the wires together, will that do anything? I know the truck's running rich at times then lean at times but I'm sure that's from something else I haven't found yet.

-Matt

 

You cannot defeat the system as designed.
The computer looks at all this for signals, signature responses and switch time intervals.
No twisting wire together because of possible PCM damage and fuse blowing. Better to leave open leads rather try any other action.
It has to be put back stock to work correctly.
Sorry, it's way more complicated that you wish for.
Good luck.

 

Tht's wht I was also thinking, however the new cat I got for the drivers side doesn't have this other sensor port on it nor can I get the old one off so I'm at a loss. I'm just worried having the sensor not being there will make the pc tell the truck to run too rich or too lean.

Appreciate helping me with this
-Matt

 

The rear sensors do not have anything to do with how rich or lean the motor runs. They are monitors for cat performance.
Only the front ones in the head pipes control fuel.
Replacement rear cats need the sensor located in the middle of the cat.
Be sure you note that when getting any replacement.
Good luck.

 

Thanks Bluegrass for the help, that just means I can leave the wires the way they are for now until I can get it fixed properly. Also, the 4.6 on this truck has a throaty sound from the exhaust like what muscle cars or strip cars sound like. Is that the triton being the triton or is there something in the engine that makes that sound.

-Matt