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Tricking O2 sensor?

 
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Old 08-07-2009, 05:28 PM
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Tricking O2 sensor?

Hey all, I tried the defouler mod on my post-cat 02 sensor because my "high flow" cat threw code 420 (cat below threshold) and it didn't seem to work.

I heard there was a way to change something electrically on the O2 sensor to trick the it into thinking it was working correctly.

Anyone heard of this?
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Old 08-07-2009, 06:51 PM
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Re: Tricking O2 sensor?

You can use a resistor to cancel ya CEL, this is what im performing manana!!! GL bro lemme how it goes!! Materials:
1) wire cutters
2) wire strippers
3) 1 10 Mega Ohm resistor rated at 1/4 watt or more. - Radioshack P/N 271-1365
4) 2 Butt Connectors - Radioshack P/N 64-3108
5) Clear or Gray Heatshrink that is 1/4x6" or larger, but I found this to be the best size. - Radioshack P/N 278-1610
6) A heatgun or lighter or anything that will make the heatshrink actually shrink.
7) electrical or duct tape/zip ties.


Procedure:
1) get under the car and disconnect the REAR O2 sensor from the socket and from the cat. To disconnect it from the cat is a bit tricky and a special tool is needed. You can get it done at a muffler shop for little to nothing. Instead of trying to think up a good excuse simply tell them that your getting a new cat and that you need to take the O2 sensor out to put it in the new one or you can tell them that the sensor went bad and your replacing it. Anyway, if you don't have the tools to get it off the cat then get some place to do it.

2) assuming that the sensor is off the car and out of the cat your next goal is to expose some of the gray wire, i believe that there are either three or four wiress, a black, 2 whites, and a gray, I THINK. Regardless there is still a gray wire.

3) cut the wire and strip about 1/4-1/2 inch on each side of the gray wire. This gap is where your resistor will go.

4) take out 1 10 MegaOhm resistor and simply insert one end into the butt connector. Then take the gray wire that you just cut (Doesn't matter which side) and insert that into the butt connector and crimp both sides. Now give a light tug to ensure that both the resistor and the wire are both secure.

5) Now slide the heat shrink over that piece and expose the other end of the resistor, the one that hasnt been connected.

6) repeat step 4 except do it with the other side of the resistor and the other side of the wire. Now crimp. There is no wrong way to put in a resister so don't stress out about putting it in in reverse, cause it can be connected both ways.

7) slide the heatshrink so that it covers the whole area that has been worked on and so that it overlaps the factory black wire
hose.

8) Now take your heating device and slowly heat the heatshrink so that it shrinks over the resistor and the two butt connectors. This makes sure that no metal or connection of any kind will losen or make contact with the frame or any other part of the car.

9) Take the electrical tape or duct tape and wrap it around the whole O2 sensor cable, or atleast the part the has the heatshrink on it. I wrapped electrical tape around the whole O2 sensor cable.

You should now be done and ready to role! Don't forget to plug the O2 sensor back in the car and you have to disconnect the battery from the car for a second from the car so that the computer will reset. Then just zip tie or duct tape the sensor and the wires to the frame and should be good to go! *** Got this mod from PO***
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Old 08-07-2009, 07:13 PM
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Re: Tricking O2 sensor?

o.o

Perfect.... /tread and rep for you!

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Old 08-07-2009, 07:20 PM
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Re: Tricking O2 sensor?

10M ohm 1/4W 5% Carbon Film Resistor pk/5
$0.99 Brand: RadioShack
Butt connector $1.99 Heat shrink tubing $2.00 Np bro, im in the bandwagon already
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Old 08-08-2009, 03:55 AM
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Re: Tricking O2 sensor?

You can buy two spark plug antifoulers, drill out one, install the sensor in that one, then install the unmodified one on top of the modified one housing the sensor, then install that one into your exhaust and you're done
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Old 08-08-2009, 10:56 AM
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Re: Tricking O2 sensor?

[QUOTE=OneRedLude;308189]Hey all, I tried the defouler mod on my post-cat 02 sensor because my "high flow" cat threw code QUOTE] he tried that mod first read before u post InvaderTrax
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Old 08-08-2009, 10:58 AM
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Re: Tricking O2 sensor?

Quote:
Originally Posted by OneRedLude View Post
Hey all, I tried the defouler mod on my post-cat 02 sensor because my "high flow" cat threw code 420 (cat below threshold) and it didn't seem to work.

I heard there was a way to change something electrically on the O2 sensor to trick the it into thinking it was working correctly.

Anyone heard of this?
YO!! InvaderTrax he tried the defouler mod n diddnt work, read before u post bro
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Old 08-08-2009, 12:15 PM
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Re: Tricking O2 sensor?

CHIP IT! lol jk although chipping your ecu would disable that o2 censor code, you gotta make sure u have all the supporting mods to chip your car..its kinda pointless to chip a car with I/H/E know wat i mean?
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