CEL P2A00 advice

gomer_110 · 06-01-2012, 10:43 PM

Damn CEL came on today. Had the code read and it was P2A00 (Bank 1 Primary O2 sensor). Haven't had a chance to crawl under the car yet to check for anything but plan on doing that tomorrow. Hopefully it's just a loose cable or worn wire. Car seemed to run fine even with the CEL on.

What I really need to know is, is it safe to push the car hard. I have a Solo event on Sun. but don't want to risk doing damage to the car. I thought I remember hearing in the past that when an O2 sensor acts up the ECU defaults back to open loop control meaning the ECU isn't compensating fuel trims based on O2 sensor feedback. If I was bone stock I wouldn't be too worried but since I'm running LTH and a CBE Im afraid I might end up running overly lean.

SPOHN · 06-02-2012, 02:42 PM

Not positive but I would assume it would be ok to run the car reguardless of the mods. Do you have a tuner you can call? I don't like the fact that this another O2 issue from someone having LTH

gomer_110 · 06-02-2012, 03:08 PM

No tuner available today and I'm not sure that would help since I'm currently just stock on the ECU side (NO Uprev). Getting ready to climb under the car now so hopefully this is just a bad connector/bad wire.

gomer_110 · 06-02-2012, 06:38 PM

So I climbed under the car and found a whole lot of nothing. The only thing I saw that I wasn't a big fan of was the that the passenger side Primary o2 sensor cable was laying against a bracket. Moved the cable and attached to another cable just to keep it out of the way but I don't think this was the issue. Cleared the code and went for a drive. No CEL in sight after 2 hrs of driving. All I can think of is that it was raining when I got the CEL so maybe when the wiring for the O2 sensor was lengthened for the LTH's it wasn't made as water tight as it needed to be.

IDZRVIT · 06-03-2012, 07:57 AM

Your O2 sensor may be perfectly fine because there are other symptoms which can trigger an O2 code - running too rich or lean for example. Hopefully it was triggered as you indicated and all is fine.

gaveup · 06-07-2012, 11:58 AM

Quote:

Originally Posted by gomer_110

So I climbed under the car and found a whole lot of nothing. The only thing I saw that I wasn't a big fan of was the that the passenger side Primary o2 sensor cable was laying against a bracket. Moved the cable and attached to another cable just to keep it out of the way but I don't think this was the issue. Cleared the code and went for a drive. No CEL in sight after 2 hrs of driving. All I can think of is that it was raining when I got the CEL so maybe when the wiring for the O2 sensor was lengthened for the LTH's it wasn't made as water tight as it needed to be.

A few of us have been dealing with this code on and off. If you do a search you will see some information out there.

I still have it, but I am willing to bet it is a problem with a gasket from the header to the test pipes and it is leaking. I am just too lazy to take the test pipes out and replace the gasket. I also have started getting PO037 which is the secondary sensor not getting hot enough. Could be the need for a new 02 sensor (although at 12.5k on the car I doubt that), or it could be an issue with the fouler j bend junk on my test pipes, OR it could be a leaking gasket on the testpipe/header.

On of these days I will get under the damn car and replace that gasket. Doesn't seem to effect driving performance at all, so I am not really concerned. I've considered just ordering the osirus cable and disabling those two codes as I can't stand a SES light, period.

gaveup · 06-07-2012, 11:55 PM

And to add, according to my logger the car remains in closed loop

Sent from my SGH-I777 using Tapatalk 2

gaveup · 06-25-2012, 02:03 PM

Oh, and I would just like to point out this is how all of the threads on this code seem to end.

No information or ideas how to fix

b1adesofcha0s · 07-12-2012, 09:42 PM

My car started showing the same code a little while ago. Got underneath the car today and nothing was loose or worn. I was thinking about buying a new O2 sensor to see if it fixes the problem. I have HFCs on my car.

06-01-2012, 10:43 PM	#1 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	CEL P2A00 advice Damn CEL came on today. Had the code read and it was P2A00 (Bank 1 Primary O2 sensor). Haven't had a chance to crawl under the car yet to check for anything but plan on doing that tomorrow. Hopefully it's just a loose cable or worn wire. Car seemed to run fine even with the CEL on. What I really need to know is, is it safe to push the car hard. I have a Solo event on Sun. but don't want to risk doing damage to the car. I thought I remember hearing in the past that when an O2 sensor acts up the ECU defaults back to open loop control meaning the ECU isn't compensating fuel trims based on O2 sensor feedback. If I was bone stock I wouldn't be too worried but since I'm running LTH and a CBE Im afraid I might end up running overly lean. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

06-02-2012, 02:42 PM	#2 (permalink)
SPOHN A True Z Fanatic Join Date: Feb 2010 Location: Covington, GA Age: 46 Posts: 14,844 Drives: Waiting on next Z Rep Power: 221	Not positive but I would assume it would be ok to run the car reguardless of the mods. Do you have a tuner you can call? I don't like the fact that this another O2 issue from someone having LTH __________________

06-02-2012, 03:08 PM	#3 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	No tuner available today and I'm not sure that would help since I'm currently just stock on the ECU side (NO Uprev). Getting ready to climb under the car now so hopefully this is just a bad connector/bad wire. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

06-02-2012, 06:38 PM	#4 (permalink)
gomer_110 A True Z Fanatic Join Date: Aug 2011 Location: Perrysburg, OH Posts: 17,992 Drives: '11 Nismo #528 GM Rep Power: 36941	So I climbed under the car and found a whole lot of nothing. The only thing I saw that I wasn't a big fan of was the that the passenger side Primary o2 sensor cable was laying against a bracket. Moved the cable and attached to another cable just to keep it out of the way but I don't think this was the issue. Cleared the code and went for a drive. No CEL in sight after 2 hrs of driving. All I can think of is that it was raining when I got the CEL so maybe when the wiring for the O2 sensor was lengthened for the LTH's it wasn't made as water tight as it needed to be. __________________ '11 370Z Nismo #528 Fast Intentions \| Stillen \| Motordyne \| Uprev \| CSF \| Zspeed \| Z1 Motorsports \| AST \| Swift \| SPC \| SPL \| Whiteline \| Hotchkis \| Bride \| Schroth \| Robispec \| Cusco \| Nismo \| Volk \| Forgestar \| Hoosier \| RJM '17 Titan Bone Stock

06-03-2012, 07:57 AM	#5 (permalink)
IDZRVIT A True Z Fanatic Join Date: May 2009 Location: Halifax Posts: 1,659 Drives: '13 CTS-V, '76 Vette Rep Power: 27	Your O2 sensor may be perfectly fine because there are other symptoms which can trigger an O2 code - running too rich or lean for example. Hopefully it was triggered as you indicated and all is fine. __________________ "America.... still builds rockets!" Vette: 355 cid, 400 rwhp '13 CTS-V Coupe: 6.2L LSA, 556HP

06-07-2012, 11:55 PM	#7 (permalink)
gaveup Enthusiast Member Join Date: Aug 2010 Location: Tamarac FL Posts: 324 Drives: 10 Nissan 370Z MB M6 Rep Power: 181	And to add, according to my logger the car remains in closed loop Sent from my SGH-I777 using Tapatalk 2 __________________ 2010 Magnetic Black Metallic 370Z 6M stillen gen 3 CAI - topspeed test pipes - invidia gemini CBE - UpRev tune 301whp (HP Logic Mustang Dyno)

06-25-2012, 02:03 PM	#8 (permalink)
gaveup Enthusiast Member Join Date: Aug 2010 Location: Tamarac FL Posts: 324 Drives: 10 Nissan 370Z MB M6 Rep Power: 181	Oh, and I would just like to point out this is how all of the threads on this code seem to end. No information or ideas how to fix __________________ 2010 Magnetic Black Metallic 370Z 6M stillen gen 3 CAI - topspeed test pipes - invidia gemini CBE - UpRev tune 301whp (HP Logic Mustang Dyno)

07-12-2012, 09:42 PM	#9 (permalink)
b1adesofcha0s A True Z Fanatic Join Date: Jan 2011 Location: MD Posts: 40,963 Drives: HypeTrain Choo Choo! Rep Power: 141	My car started showing the same code a little while ago. Got underneath the car today and nothing was loose or worn. I was thinking about buying a new O2 sensor to see if it fixes the problem. I have HFCs on my car. __________________ Project: b1adeZmobile (2009 370Z) \| Uprev Tune by AAM Competition \| Berk Exhaust Project: b1adeZmobile 2.0 (2014 C7 Z51) \| Corsa Xtreme Exhaust

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Test Pipes P2a00 CEL help	halogodx	Intake/Exhaust	3	05-02-2012 09:17 AM
CEL code: P2A00 er	gaveup	Engine & Drivetrain	11	03-29-2012 03:32 PM
P2A00 woes. O2 sensor... again	takjak2	Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs	9	03-13-2012 11:36 AM
CEL Code - P2A00	evse82	Intake/Exhaust	21	03-01-2012 06:53 PM
Throwing code P2A00 after installing stock cats	ArtVandaleigh	Engine & Drivetrain	8	11-03-2010 06:48 PM