Please Help me I have been digging around for days looking for some help with my problem. I just recently started modding my z. about a month ago I got a cod for my catalyst below threshold in bank 1(which I am assuming was a problem with my cat) so since I had already order a Stillen Cat back exhaust I find a local guy that sold me so brand new test pipes(they have resonators) I had the exhaust installed and my check engine light reset, but after about 45 miles I got the same check engine again. So I ordered "o2 simulators"(they were really just spacers)(actually they were only spark plug non foulers driller out and screwed together to make them long enough) on ebay for the 3 rear sensors.. well I installed 1 side and broke the other so since it was just a non fouler i pick up another one for the parts store drilled it out and installed it. I went about 150 miles with no check engine. but then we had a cold front(i dont know if this effected it or not) and the weather went from mid 70s to 40s and i got the check engine light again. I never check to see if it was the same code. I came home and installed my new Aem cold air intake and reset the code. after about 40 mile the light came back on. so I took my actron pocket scanner and ran the codes and now its saying i have p2a00 and p2a03 and the description for both is "Fuel air metering auxiliary emissions controls."

I am thinking about removing the spacers and seeing what happens if that does not effect it I am going to try and adding another non fouler(making them 3 non foulers long) to the rear o3 sensors and see if the increased distance away from the pipe makes a difference. If not I am trying to find some kind of electrical sensor simulator or something.

What should I do? please help thank you so much

 

To add some more information the code I was getting before was a p0420 Catalyst System Efficiency Below Threshold (Bank 1) and another website says that my p2a00 is O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 and my p2a03 is O2 Sensor Circuit Range/Performance Bank 2 Sensor 1

 

Oh dear this is confusing:

Sensor #1 is the pre-catalytic converter sensor. You are NOT going to fix it with a non-fouler.

A non-fouler should be about 1-inch long. You can piggyback non-foulers, but it will do you little good.

 

Thats what I was assuming but I was worried because the light came back on before I installed the aem intake... So i figured it was the the same issue as before.. I am assuming that the front pre-cat sensors are throwing codes do to the intake.

Is there any simulators or something similar that I can install to fix this issue.

 

No. You either repair or replace sensors #1. There is no cheap fix.

 

Ok I hope that the sensors are actually the issue because I am going to order new ones tomorrow and thy are $125 each .

 

A lot of 06+ are having this problem. Is it the sensor? I'm not convinced.

 

That's why I'm afraid to buy new sensors.. I don't want to spend $250 on 2 sensors and it not fix anything.. The car is still running fine an I have no Loss in power.. But the light being on just worries me I hate thinking that my car that only has 40k on it is already broken..

 

I had cracks in my TP's. Had them welded and no more light.

 

^^ SPAM

What we found at our shop up here, is after resetting the ECU and the car has to go relearn all the parameters, take it on a non stop 100+ mile drive. Worked on my 06 350z and everyone that came through the shop that wanted to delete the cats.

 

https://my350z.com/forum/maintenance...-ses-code.html
https://my350z.com/forum/engine-and-...from-hell.html

 

Really? My EVAP sensor won't ready either. Do you know if this will take care of that as well?

 

The sensor is most likely not the problem but when I threw a P2A03 code I replaced it anyway (bank 2 sensor 1) since I'd already changed 2 of the 4. After 8 days the dealership determined that my MAF had gone bad.

 

So they replaced w/ no problem? Light has stayed off? What mods do you have?

 

So far so good. WAI, high flow cats, and a catless y pipe are the pertinent mods on my 06 Altima SER. I used to be on here when i had a 03 Z and I searched for this problem here because I couldn't find 1 other altima who has had this problem. My car was running so pig rich from this problem that I swore I had an exhaust leak but could never find one. The dealer replaced my MAF and my bank 2 sendor 2 oxygen sensor which was the last of the originals.

 

that could be one of my issues cause i didnt get the P2A03 till my cai and I am no longer getting a p2a00 since i went to just 1 non fouler on each side instead of 2 but i am now gettin a p0420.. but i bet the issue is my maf since i sucked water up the other day but idk it seems to run fine i had a maf issue on my lexis gs300 and it ran terrible..