97MaximaSE

I have a 95 gforce in my 97 and i have been getting the rear o2 code for over a year now. I read a post a few weeks back on how someone used an o2 simulator and it removed the light. I was wondering where can i get one and if i should get one for 95-96 or 97-98. Thanks

DrX

Never heard of it. Sounds illegal though.

maximum810

I'm trying to find out info about the emulator myself. A couple of my friends with WRX's have them, but I haven't gotten into the fine details. I'm not sure if you have to get one that's specifically for the car or not. I believe they have them for the 350z's and G's. They're like dummy sensors you plug into the o2 sensor's spot, and then you weld and shrink wrap something. If anyone knows anything, I'll be glad to know too.

twiggy144

I installed it, works fine. But you have to add a O2 sensor heater simulator such as a resistor ( I think a 3 watt automotive bulb will work) else you will still get a ECM code for same.
I found it on ebay look for oxygen sensor simulator.

97MaximaSE

does it actually replace your existing o2 sensor or does it still stay in there...do you have a diagram on how to hook up the heater sim...also can you use any simulator for the o2 or is it model and make specific thanks

twiggy144

The sim only works for the rear O2 sensor . The ECM does not use the signal from the rear O2 sensor in loop to manage the engine. It's only purpose is to tell you if the cat is working ok. If it detects abnormal O2 content, it lights on the CEL.

Because the ECM actually uses the signal from the front O2 sensors to manage the engine, the fronts cannot be replaced by a sim. Also, there is no emissions test where I live, so the sim was ok for me.

The diagram is included in the shipment. It is very simple. The sensor has 4 wires, so does the sim. You basically cut off the actual wires of the O2 sensor and splice in the wires form the sim.

I tied the sim under the driver`s seat, about where the grummet for the rear O2 sensor pig tail is located and enters the cabin through the car floor.
I left the non functionning O2 sensor in the pipe to keep the threaded hole plugged.

The sim does not simulate the heaters of the O2 sensor though. No big deal, I spliced in 2x 25 ohm resistors ( total 50 ohm) in lieu of the heater wires. ( 2 white wires if I recall right). My guess is a 3 watt 12 V automotive bulb will work just as fine. The only purpose is to fool the ECM thinking a small electric current passes throughtr the heater wires. Else the ECM will throw a P0141 code (0902 flashing codes) "rear oxygen sensor heater or circuilt fault".
Hope this helps you.
the seller of the sensor on ebay is baker electronics.

Brudaddy

iTrader: (2)

good write up. I will have to keep this in mind.

twiggy144

Thanks for your kind comment Brudaddy. Save the whole page on your hard disk for future reference. That's what I do..

97MaximaSE

thanks for the good info...i was always under the impression until now that there was no way to fix it unless i used my old 97 ecu instead of the 95 since the wiring was different. i guess now i can finally pass emmisions in CT since my check engine light will be off and the computer wont be throwing any codes

twiggy144

Yes, the ecu will be fooled all right. But if you have a bad cat, an emissions test at the exhaust pipe will probably detect it.
If you install a sim, let us know how it went for you. My installation was perfect.

97MaximaSE

i know my cat is still good....i can hook up my old ecu and everything is ok. anyway i need to find a place to get one since when i searched on ebay i couldnt find any

PoePoe2797

For CT emmisions, any 96+ they just check your computer for codes....no checking the actual exhaust fumes

97MaximaSE

i know and right now i have a rear o2 code which is why i need the sim

twiggy144

here it is on ebay. this is the one I installed:

http://cgi.ebay.com/ebaymotors/ws/eB...tem=2466405033

twiggy144

this post makes us even with 424 posts each lol

oh and while on ebay, read my feedback th the seller; my nickname is same : twiggy144

97MaximaSE

sad part is ive been a member for maybe 4 years or more.....oh well i used to lurk a lot

97MaximaSE

this site says that the heater wires are built into the sim

http://www.o2simulator.com/4436.html

is this the same thing you have or will it work better?

twiggy144

I ordered my sim from the ebay seller which link I posted above. The sims appear to be very similar. The o2simulator.com looks like $5 less expensive than what I paid, if you factor in cost of shipping.

I looked carefully at the diagram on o2simulator.com . My conclusion is that the heater wires are not included in the sim. This sim will therefore not simulate the o2 sensor heater in good working condition. Your maxima will still throw a P0141 code (0902 flashing codes) "rear oxygen sensor heater or circuilt fault".

The sim does not run by itself. It needs a +12V supply ( very low amperage though) to operate. What the diagram shows, is a tap into the +12V power line that normally feeds the heater of the o2 sensor, to feed the sim. The sim will create a 0.9 volt signal ( 0.9 Volt if i remember right) to send to the ECM to fool it. The diagram also shows to leave the heater wires of the o2 sensor connected, to avoid the CEL P0141 code (0902 flashing codes). You could tap a +12V power line from anywhere else on the car if you want. Using the +12V line that feeds the o2 sensor heater is perhaps the easiest installation

In my case, I cut all 4 wires of the faulty O2 sensor, two of these wires are for the heater of the o2 sensor. So, besides having to simulate an o2 signal, I also had to simulate the heater signal. This is why I installed 2x 25 ohm resistors in series (total 50 ohm) in lieu of the heater wires. My guess is a 3 watt 12 V automotive bulb (no 194?) will work just as fine. The resistors get hot, so would a 3 watt light bulb. I figured there would be enough circulating air under the drivers seat (under which I tied down both the sim and the resistors) to dissipate the heat. I did this installation 3 months ago now, everything is fine. My ebay sim seller supplied the resistors for free, but the 3 watt light bulb option is also inexpensive. If you go this route, I suggest you also get a bulb socket (available at any auto part store).

BakerElectronix

Twiggy144 is correct. www.O2simulator's module does not simulate the O2 heater. Their web site has a wiring diagram that shows the old heater being left connected when using their module. The only difference I can see from our DualO2 simulator and theirs is that :
1) Their module is not for dual exhaust they only have one output.
2) Their module is $5 cheaper (Just ask and I will match their advertised price)
3) They are giving a lifetime warranty (again, Just ask and I will match this)

All of our products are made in house and we stand behind them. We also make custom modules let us know what your needs are. If you have any questions let us know.

www.bakerelectronix.com

bakerelectronix@verizon.net

Subzero

iTrader: (5)

do i need the resistors or can i use the simulater wires, kind of confused on the wiring part? do the resistors come with it (i just purchased one)?
thanks

97MaximaSE

you need a resistor...just ask and they should include one for free

97MaximaSE

well i got mine hooked up...light blinks...CEL still goes off for rear o2 so i reversed 2 wires since my harness was a universal and the colors were different...so far 50 more miles and its not on yet but last time it took over 60 so we will see today

twiggy144

I have been driving 3 month now. No more CEL for the rear O2 sensor. You should be fine. If not, I bet your connections are wrong.

97MaximaSE

well i know the heater and the resistor wires are hooked up correctly since the sim blinks and i tested them out with the multimeter but the other two i werent sure about to i just reversed them. so far no cel but like i said last time it took almost 100 miles to come on so we will see

97MaximaSE

ok well it still doesnt work....how about you make me one and i will pay you..sound good??? i really hate this light

twiggy144

Did you pull the codes form the ECM? ( number of CEL flashes)? what are these codes. I have a Haynes with all the code descriptions.

97MaximaSE

same code as always 0707....i reset the ecu everytime i rewired it

twiggy144

0707: downstream oxygen sensor circuit slow response fault.
That would rule out the heater wires of the sensor as being at fault.
I' m thinking: could it be the wiring between the ECM and the o2 sensor conector that would be bad?
Unlikely, but small possibility.

97MaximaSE

i doubt it...since when i used to put the old ecu in the code would go away i probably screwed something up

BakerElectronix

That is an odd code to get, O2 sensor slow response. Normally as an O2 sensor ages and gets contaminated and it will transitions from lean to rich slower and which will give this code. For our simulator to cause this code I would suspect a lot of resistance and/or capacitance in the wires for some reason, long length maybe. If this is our DualO2 Simulator I would suggest connecting both of our outputs together and connecting them to your O2 signal wire this will reduce the signal impedance and should help the signal switch faster at the ECM. Also some people have found grounding the simulator and O2 heater grounds on the chassis helps.
If you are still having problems please let me know.

Neil Baker
bakerelectronix@verizon.net
www.bakerelectronix.com

(P.S. We have lost Emails from 4/1/04 to 4/9/04 so if anyone has emailed us and didn't get a reply please resend it.)

97MaximaSE

i wish i ordered from you but unfortunatley at the time i ordered i didnt know you existed. I ended up getting a 3 wire one which i cant seem to get working. I dont know if its the resistor thats shorting it out or im hooking it up wrong but the light blinks. Code never goes off though

97MaximaSE

if you want i will send you this one and you can check it out to see if it sucks or not?

BakerElectronix

I would be interested in finding what not to do. Who made it? You can send it to us at:
Baker Electronix
P.O. Box 666
Beckley WV, 25802

Have you already purchased a replacement? Maybe I can give you a dud credit.