c.e light back on-o2 sensor
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From: Pulaski, TN
c.e light back on-o2 sensor
my c.e light has ben on ever since i got my truck, had a fuel problem the other day so i was fooling around with the fuel pump relay, after that the light went off for 1 day then it came back on so i took it and hooked it up to the computer and it said i had a bad o2 sensor it is the o2 sensor downstream from the manifold but there has been some exaust mods and the o2 sensor is not there, does anyone know what i can do to fix this. the guy at auto zone said i could get a o2 sensor diagram for my truck and put it in the right place, just hoping there is an alternative to my problem, i don't know if the 02 harnes is still there.
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From: Central NY
Aside from remounting the O2 sensor so that your computer can operate the engine properly, you might be able to use one of those 'perfornace'resistors that go in place of your temp sensor. It fools the computer into thinking the engine is always cold whicht might keep it from checking the O2 sensor also.
But I'm really recommending reinstalling the O2 sensor thou.
Cheers,
Popa Tim
But I'm really recommending reinstalling the O2 sensor thou.
Cheers,
Popa Tim
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From: Concord, NC
Get an O2 sensor simulator if it's the downstream sensor. Summit Racing should have them. Or, weld in a bung for another O2 sensor. It should be located either between the first and second cat, or after both cats, I'm not postive which one it is. It is there to monitor catalytic converter efficiency and is not critical for engine management, so if a simulator is the easiest route, that's what I would do. Be aware that the two O2 sensors in the exhaust manifolds cannot be swapped for a simulator.
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The O2 sensor is NOT critical to engine managment??? WWWha!!! Excuse me if I just went retarted but I have five different books all telling me that the O2 sensor is one of (if not) the most important sensor in an engine. It tells the CPU what the A/F mixture is in the exaust gas PRIOR to the cat. Without the O2 sensor the CPU has no way of knowing what's going on with the A/F mixture. I also have no idea where 1st and 2nd cat's came from. Unless you have dual exaust you should only have one CAT. Even with dual exaust there is only one CAT per side and the O2 sensor should be mounted before one of these. Unless whoever did the exaust mods totally butchered the job you should be able to find a plug under the truck about the size of a dash cigarette lighter. If you find it count the wires (2-3-or4) and get a sensor to match. You should weld a bung to put the sensor in but drilling and tapping the pipe PRIOR to the CAT will probably get you by. If you cant find any wires you will have to trace the problem back to a harness and fix it there. Good luck. Karl... P.S. how does someone with over 3,000 post's say that the O2 Sensor "is not critical to engine managment"?
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From: Concord, NC
Calm down, and re-read. There are three O2 sensors on OBD-II trucks, and the third is only there to monitor catalyst efficiency, and has nothing to do with engine management. The other two are used for engine management, and I've never said anything to the contrary. They are not the main sensors for the computer, that duty is held by the MAF on a '96 OBD-II truck. The O2 sensor cannot handle running the truck, it is there to give feedback on how accurate the computer is in determining the correct ratio based on inputs from the other sensors. There are two catalysts on these trucks, that is commonly known. P.S. I have over 3000 posts. I'm not trying to be arrogant, but in this case I know what I'm talking about.
Last edited by EPNCSU2006; Jul 1, 2005 at 03:41 PM.
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From: Pulaski, TN
Originally Posted by EPNCSU2006
Calm down, and re-read. There are three O2 sensors on OBD-II trucks, and the third is only there to monitor catalyst efficiency, and has nothing to do with engine management. The other two are used for engine management, and I've never said anything to the contrary. They are not the main sensors for the computer, that duty is held by the MAF on a '96 OBD-II truck. The O2 sensor cannot handle running the truck, it is there to give feedback on how accurate the computer is in determining the correct ratio based on inputs from the other sensors. There are two catalysts on these trucks, that is commonly known. P.S. I have over 3000 posts. I'm not trying to be arrogant, but in this case I know what I'm talking about.
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From: Concord, NC
On the '96 trucks, there is a third O2 sensor that monitors catalytic converter efficiency. If the cat is not working or missing, the CEL will be turned on indicating a malfunction. You can get around this by using an O2 sensor simulator for the downstream O2 sensor that monitors the cat efficiency. This will tell the computer that the cat is functioning normally, even without a cat, and will not turn on the CEL unless another problem arises.
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From: Pulaski, TN
where can i get an o2 sensor simulator, can i get it at the autoparts store and about how much$$$, and just incase i didn't say, i don't know if it will matter or not but all the senors are still there.
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From: Concord, NC
Summit racing should have the simulator you need, and again, I stress that it's only for the O2 sensor farthest away from the engine. The other two need to be there for engine managment. The simulators are about as expensive as an O2 sensor (you should only need one). So the third O2 sensor is there? Is(are) the cat(s) gutted?
http://store.summitracing.com/defaul...=egnsearch.asp
http://store.summitracing.com/defaul...=egnsearch.asp
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From: Pulaski, TN
no the one cat i do have is not gutted as far as i know and the computer says it is the o2 farthest away from the engine, do i just replace the o2 with the simulator,
have a great 4th of july
have a great 4th of july
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From: Pulaski, TN
epncsu2006, this is the simulator i found on summit racing http://static.summitracing.com/globa...i-104040_w.jpg but i need to know if it just plugs in where my old 02 sensor was at or what, and i just read the post by rotor, and i am not trying to be an xxxxxx but i would like to know what kind of books he has been reading, he says all trucks only have one converter unles they have dual pipes, my truck came factory with single pipe and did have 2 cats, but now after some exaust modification it has dual pipes and 1 cat, its not true duals just 2 pipes after the cat out of a y, and now the 02 sensors on bank (manifold) are critical but the 02 downstream at the cat shouldn't matter, i believe it is basically just for emissions, well anyway how do i put this in, thanks, jimbob
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From: Central NY
Originally Posted by jimbob21rc
... un plug the 02, put the sim in its place in the harness and just leave the 02 in the pipe.
Originally Posted by jimbob21rc
...it is the o2 sensor downstream from the manifold but there has been some exaust mods and the o2 sensor is not there...
Old and easily confused,
Popa Tim
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From: Concord, NC
The O2 sensor isn't the problem in this case; it's that the exhaust isn't stock. Even a new O2 sensor would turn on the CEL due to what the computer perceives as an inoperative cat. converter.