For the past week Ive been throwing this code. Did the search, seems to be alot of different things and no fix. Im also twin turbo'd. Also Ever since I got these codes my power band seems to struggle on third gear. For example, I would ride hard on 3rd gear but once it hits 5500rpm it would either stay there or struggle there. Also happened to me yesterday but this time one 6500rpm. Thing is it would only do it on 3rd gear but why only on high rpm? Now should I change my whole stock cats to HFC? Change out the o2 sensors? Im pretty sure I have a leak cause the other day I had the car on and saw water vapor drops coming between the exh pipe and the cat converter; passenger side. Mods are APS twins and hks hipower with stock cats.

 

p2a00 “O2 Sensor Circuit Range/Performance, Bank 1 Sensor 1”
P2A03 “O2 Sensor Circuit Range/Performance, Bank 2 Sensor 1”
http://www.alldatadiy.com/about_alld.../diagnose.html

These are the O2 Sensors before the Cat's. Whats going on is at low RPM's your ECU reads all 4 O2 Sensors and does a comparison. I think they call this closed loop. Now at Hi RMP's you ECU goes in to Open loop "correct me if I am wrong" There for no longer doing the comparison.
Just like with mine I noticed that I only got the SES light when I was driving normal (Below 3000 RMP). Now When I ran the car hard I never saw the SES light. (RPM's mostly above 3500)
I hope I got the whole open/closed loop thing correct. Hope this helps some.

You may need Non foulers.

Now in my case this is what I found.
https://my350z.com/forum/7141409-post204.html

There are a number of threads these codes. This one below was someone using Test pipes
https://my350z.com/forum/engine-and-...-fix-read.html

 

I saw these threads and might need to go with the berks hfc with non foulers. I just wanted to know if anyone else have dealt with these codes and actually had a permanent fix for it.

 

Well for me I am just getting replacement Cats from Berk. Now I am not sure but I think Osiris can Suppress these codes.

Best of luck,

C

 

thanks cdoc. did you have the same codes as me? if so did you get it fixed? What id osiris?

 

Glad someone brought this up again. I have the same code (p2a03). Can't still find a fix . I have berk hfc and I detect no leak.

someone mentioned to me about non foulers but haven't installed them yet.

Let me know if anyone kns a permanent fix for this.
Thanks

 

I thought berk cats come with non foulers?

 

Not that I kn off

 

Yes. I had the P2A03. Cause by the cracked Cat.

Osiris is a software tool from Uprev. Like I said I am not 100% sure if or what all codes it can suppress.

Now you could always build/buy some 02 simulators. My buddy runs them on his Tacoma. He has long tube JBA headers. The 02 simulators work great.

For your setup, I would just search Google/e-bay for 02 sensor non foulers.


As for your dkhanijao. What year Z. Also have you logged your AFR's. Yours may be lean condition. Just my

C

 

thanks again. I doubt I can run osiris with my unichip aps, so Im going ahead and get some some berks hfc

 

You could run Osiris.. But it's going to cost you some. Also what are your current ARF's.

 

I have no idea I have the access port I believe it was around 12

 

thats what the access port was reading not sure though