I have been doing some digging here and on the web but can't find an answer to the issue.

I installed the dual 02 sim last night on my 01 maxima. It was originally throwing a P0430 code. Well this code is gone, but now the car is throwing a P1168 code (closed loop control bank 2). I am a little confused by this. Is this due to not having a resistor on the heating wire of the Bank 2 sensors? Or is this due to a bad primary 02 sensor? Any help or guidance on what next step I should consider would be a HUGE help. Can't pass inspection and don't want to shell out for a CAT.

Thanks,
Jarad

 

Did you wire the sim correctly? You should get no codes.

 

I believe so I wired it up with black from sim splicing to black on 02, white intercepting white from ecu on both 02's, and the red spliced with the red/yellow wire from one of the 02's. See I think I have it wired correctly b/c it no longer throws a P0430 code...

Thanks for the post, I will recheck the wiring tonight but I am darn sure it is correct. Maybe one came loose...but I did crimp the wires together.

Jarad

 

Wait is the white one that goes to ecu supposed to go to both secondary o2's? Mine are spliced on the same one.. And i'm throwing a code..

 

Thanks for pointing out the wiring diagram. I misread it. Bam I just got rid of mine thanks.

 

yup yup no problem E.

Ok, so I think *fingers crossed* I might know my problem. I had originally installed an 02 fouler (actually a spark anti fouler double stacked) that was suppose to limit the air to the 02 sensor. Well it cleared the P0430 code but threw a different one, so that is why I took the next step to the 02 sim. I left the anti fouler on with the 02 sim installed. So tonight I took of the anti fouler and will hope in 60ish miles my SES dosen't come on.

If someone knows exactly what the heater wire on the 02 is for would you chime in? Is it suppose to read the temp off the 02 and report to the ecu if it is with spec or not? Just a random guess.

Thanks,
Jarad

P.S. I will update once I drive tomorrow.

 

Why didn't you just install a new O2 sensor to clear the P0430? Why go with the sims?

 

guessing cheaper and money is tight, plus secondary o2's arent needed

 

http://forums.maxima.org/5th-generat...tallation.html

 

Don't feel like buying a cat for $800 or whatever the insane cost is for it.

Ok, so I took out the fouler and....threw a SES within 8 miles. I am still pulling a P1168 code.

superstain, that is the write up I used. I have wired the sim correctly but still getting the P1168 code.
VQpower, a P0430 code is not just a bad 02, it indicates a bad precat too. I don't have a problem buying a new 02, but don't want to splurge on the new cat.

Does anyone one if the 02 sensor still needs to be operational even when the sim has been installed. What I am curious about is if the 02 is totally caput and not sending the correct signal for the heating wire to the ecu. This is the only wire that the 02 sim does not interrupt or splice into. Anyone have thoughts?

Thanks,
Jarad

 

I got rid of my 138 and 158 code.. Now got a 0037 code. Man we just keep knocking down codes..

 

I see. I've had the P0430 code before and just swapped in a new O2 and I have been golden for a few thousand miles.

 

The heater circuit for the O2 still needs to be functional. If not, obviously you will throw codes for it since the O2 has no function at all affecting the heater circuit.

BTW, to answer your earlier question, the heater wire isnt there to "sense" the temperature. It runs a current through the O2 to heat it up to operating temperature. O2's are designed to read at a certain temperature and when they are cold the readings arent right, therefore they are heated when in the "cooler" downstream air. The ECU detects the voltage in the wire which tells it if the resistor that heats the O2 is functioning properly. If the voltage is out of range, the resistor is not right and you get a code

 

Disregard this post. I'm an idiot. I had a P0140 code which was just the O2.

 

If those go back to the secondary sensors. Just get the 2 10 ohm 10w resistors. Took me 10 minutes to wire them in. Took off the 2 sensors completely. Cost about 5 bucks.
ses is gone.

 

Gemner, thanks for the information.

E-sub, When wiring for the resistor do I need to cut the heating wires and then solder each wire to the lead on the resistor?, or can I just take the 2 leads on the resistor and wrap them around the exposed wire? I picked up a new 02 sensor to see about dropping it in and seeing if it corrects the P1168. If not I will go and pic up the 10 ohm 10w resistors. Thanks for the specs, helps me out a lot since I am a little electrically inclined haha.

I will update with the changes and if I throw anymore codes haha.

 

Little update

Installed new 02 on B2 Sensor 1, this is precat front 02 sensor. Still throwing a P1168 code.

So.....I went back and reread the 02 sim write up and I now have a question. Looking at this diagram
http://maxima.theowensfamily.com/tsb/NTB02-051a.pdf

I installed the sim on the "Blue" shroud H02S1-B2 and the "Red" shroud H02S2-B2....but after rereading Puppetmasters thread http://forums.maxima.org/5th-generat...tallation.html I noticed he said the White shroud "Bank 1 (rear bank) downstream O2 sensor" which I think is HO2S2-B1, and also on the Red shroud "Bank 2 (front bank) downstream O2 sensor" which is H02S2-B2. Can anyone look at the first link "theowensfamily.." and tell me which 02's the sim is suppose to intercept??? I am thinking it should be "Blue shroud" and the "White shroud"

thanks guys,
Jarad

 

Feel free to give me a call anytime. I just went through all this so It's fresh in my mind.

It's tons easier to understand and get your questions outta the way over the phone rather than back and forth through this.

 

will do, I will give you a shout tomorrow. Thanks E

 

what white shroud? Puppetmaster's writeup is right. Im not sure what you did, but it sounds like what you did is wire the sim into the primary O2

These are the possible causes for 1168 according to the FSM

1) The heated oxygen sensor 1 circuit is
open or shorted.

2) Heated oxygen sensor 1

3) Heated oxygen sensor 1 heater

 

Alrightyy, little update.

Well finally got everything sorted out and passed inspection. So, I had the secondary for the bank 2 cat wired correctly but I had accidently wired the primary for the bank 2.....(good thing there are 2 primaries :/ ) So I switched the 02 sim wire from the primary 02 I accidently wired to the other secondary on Bank 1. After doing this, I realized I had bought the wrong 02 sensor to correct the P1168 code. Went to autozone and picked up the secondary 02 sensor for bank 2 and replaced it ($100 bones...yikes).

I got myself all confused during this process, but thankfully with the forums help and a little convo with e-sub I got it done and passed inspection .

Word of advice. This might seem obvious, but the secondary 02 sensors are the ones that come AFTER the cat. Don't ask me why I thought differently but working on your car at 2 a.m. doesn't provide the most clear thought haha.

Thanks again,
Jarad

 

All you need to remember when wiring o2s, to keep primaries and secondaries straight, is that thr primaries are three wire while the secondaries are four wire

 

Np bud, glad it all worked out.