O2 Sensor Bypass [Merged 8-9] by pass oxy rear secondary catalyst cat converter

[WNNAFLY]

Hey guys,

I am trying to get rid of my rear O2 sensor.

I found this site. http://www.thefbody.com/~95tsiawd

I made the circuit and it still doesn't work. Still get the Service engine soon light that when a scaner is hooked up, points to the rear O2.

I couldn't find a 12 ohm ceramic resistor so I used two 10 ohm 12 watt ceramic resistors for the heating circuit. This still gets really hot?

Those resistors should be enought to handle the 1 amp of currant that heats the sensor up according to ohms law.

Has anyone on here tried this? If you have can you tell me what you did?

Thanks

Adam

 

[1sickgst]

If you don't have a catalytic converter, then you don't need the rear sensor. And there's no sense replacing a sensor that no longer has a function. Just eliminate or bypass it.

That's what I had thought. Thanks for confirming. If you would, please describe the difference in the effect that would happen in either bypassing the O2 or eliminating it all together. Would it have the same effect no matter which option I took? I would think that w/ there being no O2 it would cause problems. Where as, if you bypassed it, it would sense the O2 is there and working. Thanks.

 

[99gst_racer]

That's what I had thought. Thanks for confirming. If you would, please describe the difference in the effect that would happen in either bypassing the O2 or eliminating it all together. Would it have the same effect no matter which option I took? I would think that w/ there being no O2 it would cause problems. Where as, if you bypassed it, it would sense the O2 is there and working. Thanks.

You have many options.

#1. Remove the sensor and plug the hole. CEL will trigger. Car will opperate like normal.
#2. Leave exsisting sensor in place. CEL might trigger. Car will opperate like normal.
#3. Replace sensor with a new one. CEL still might trigger due to a lack of a catalytic converter. Car will still opperate like normal.
#4. Use sensor simulator. CEL will *not* trigger. Car will opperate like normal.
#5. Remove sensor and plug hole. If applicable, use tuning tool such as DSMlink to turn off CEL and set up to cease scanning that port for diagnostics.


Regardless, your car will run fine. That sesnor is simply there to test the efficiency and functionability of your catalytic converter. When it senses a problem, your CEL is triggered, but the car will still run the same.

 

[1sickgst]

Great, that's all I needed to know. Very helpful.

 

[Big Woo]

Sorry I must have missed that in your post. If you have removed the cat, then the rear O2 essentially has nothing to monitor. The rear O2 is there for emissions purposes. Not having it there will not change the front O2 and ECU's ability to tune A/F's.

Personally I have never had much luck with the emulators. DSM link and some others do have the ability to ignor the rear O2, otherwise the CEL will most likely come on.

If your running too rich then your problem lies eslewhere.

 

[talonz27]

so i built this simulator exactly like this one, and i still have the CEL code for bank 1 sensor 2. (p0141)

http://www.dsmtuners.com/forums/showthread.php?t=221951

could it be that my ground wire that goes to the exhaust is missing?
im clueless why i still have the cel on. any help is very appreciated thanks guys.

 

[JFZERO ECLIPSE]

You have many options.

#1. Remove the sensor and plug the hole. CEL will trigger. Car will opperate like normal.
#2. Leave exsisting sensor in place. CEL might trigger. Car will opperate like normal.
#3. Replace sensor with a new one. CEL still might trigger due to a lack of a catalytic converter. Car will still opperate like normal.
#4. Use sensor simulator. CEL will *not* trigger. Car will opperate like normal.
#5. Remove sensor and plug hole. If applicable, use tuning tool such as DSMlink to turn off CEL and set up to cease scanning that port for diagnostics.

I've been trying to read as many pages as I can about eliminating/bypassing the rear 02 sensor....and yes I did search every page I could find, but I did not find a 100% answer to my question....

Is it possible to:
1. Remove the rear o2 sensor from the exhaust
2. Plug the hole in the exhaust
3. Cut the sensor off the wiring and then wire everything in as necessary...So that is more or less like a plug and play unit...???

The way I seem to understand everything is that you got to leave the o2 sensor ON the car but wire the resistors and everything on the wires between the sensor and where it plugs into the car....

Sorry for the older thread but it was the newest 1 I found

 

[99gst_racer]

I've been trying to read as many pages as I can about eliminating/bypassing the rear 02 sensor....and yes I did search every page I could find, but I did not find a 100% answer to my question....

Is it possible to:
1. Remove the rear o2 sensor from the exhaust
2. Plug the hole in the exhaust
3. Cut the sensor off the wiring and then wire everything in as necessary...So that is more or less like a plug and play unit...???

The way I seem to understand everything is that you got to leave the o2 sensor ON the car but wire the resistors and everything on the wires between the sensor and where it plugs into the car....

Sorry for the older thread but it was the newest 1 I found

If you remove the sensor and plug the hole, it will trigger the CEL, but it will not affect the way the car runs.

I don't understand what you're referring to in your #3.....

 

[JFZERO ECLIPSE]

Basically the way I was thinking bout was you got o2 sensor in the exhaust, take it out and plug the hole. Do not start the car yet b/c it will trigger a CEL (already knew this).

Disconnect the o2 sensor from the harness, proceed to workbench, cut o2 sensor off so all you got left is a plug and 4 wires....
Proceed to solder in the resistors and such, shrink wrap everything and then black tape over it for extra safety.

Go back under car plug the o2 sensor back in and voila it wont set off a CEL.

The way I see it that would be the only pure way to eliminate the rear o2 is to cut out out of the equation....

Will this work yes or no????

 

[Randy08]

Ok I did the bypass but I have a problem. the connector in the car that goes to the rear o2 sensor was melted so what wires do I match up that are before the connector to the bypass? I tried lining them up but it throws a code now for p0141 which is a dif. o2 code. thanks for the help its appreciated!
-Randy

 

[Randy08]

bump. any1?

 

[DGajre777]

Don't bump your threads, you'll get them locked by a moderator.

As for the wiring - http://www.dsmtuners.com/forums/articles-electrical-wiring/244376-oxygen-sensor-wiring.html

 

[codyw]

This is what I used.
Visual Frequently Answered Questions - Home Page

 

[dtx001]

I tested my bank 2 oxygen sensors with an ohm meter. The heater element wires 'C' and 'D' show a readout of 4 ohms resistance. Shouldn't I build the bypass to also have 4 ohms resistance to simulate the sensor heating element?

Or will the bypass work with the two heater wires disconnected and just modifying the o2 part with the capacitor and 1M ohm resistor?
The reason I ask is that by looking at a sensor diagrapm, the heater wires do not appear to be wired thru the computer. One lead goes to a ground dstribution cell, the other to a (hot start & run) power distribution cell.

 

[talontsiboy24]

i have a full 3" turbo exhaust with downpipe but i have a hi flow cat that i so badly wanna delete but pass emissions since my car is a 97 how can i do it?

 

[xsboost]

O2 sensor bypass

 

[snowborder714]

Easier to understand.
http://www.dsmtuners.com/forums/art...making-your-own-rear-o2-bypass-simulator.html

 

[romeen]

I wrapped my rear O2 sensor with aluminum foil and twisted a thin wire around it to hold it in place. I replaced the wrapped sensor back in stock location. That was 8 years ago. I have never had a CEL running w/out a cat the entire time.

 

[dannyd97gst]

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I have seen these used with no problems, basically extends the o2 out of the flow of exhaust.
Although the aluminum foil idea sounds pretty good.

 

[Rob10_99]

Those work on even the most sensitive NA cars. What it's doing is making a delay in the AF readings from the 1st to 2nd sensor. Usually need these on cars with cat replacement test pipes.

 

[Blurred Talon]

I've got a question, I plan to do this with my car this weekend. However I cannot locate any 50ohm wire wound resistors.

Can I use 2 100ohms instead or something different to get close to it?