P2A00 woes. O2 sensor... again

takjak2 · 05-01-2011, 11:05 PM

At ~19k miles my car threw this code, reset it multiple times, and had the O2 sensor, as specified in in service manual, replaced under warranty. No more SES light for almost 3k miles.

After some rough driving it came again and I took it to a different dealership. They again replaced an O2 sensor under warranty, noting that the wire had "been stripped"/abraded some (that could have been me) and that it looked jarred (sounded to me like a poor install the last time?). Supervisor said that should fix it but "if it comes up again we'll have to look at the fuel system" [implied sender]. Another thousand plus miles no SES light.

There was a P0400 code (I think that's what it was), same as others with aftermarket exhausts or test pipes except that mine is entirely stock nismo. Reset it, saw it again after a hundred miles, reset it, and have not seen it for at least another 1000 miles.

Now the P2A00 is back again and haunting me after a reset. Any thoughts before it goes in tomorrow?

takjak2 · 05-08-2011, 12:25 PM

No thoughts? Stuck in Army training for another two weeks before I can get the dealership's take.

370zproject · 05-16-2011, 10:06 PM

bump

DIGItonium · 05-17-2011, 08:44 AM

How does your car behave with the failed O2? How does it affect acceleration? Engine roughness due to weird fuel trimming? Just wondering... thanks!

takjak2 · 05-17-2011, 07:52 PM

I believe this sensor does not affect the ECU, just a warning/indicator/emissions. I have not noticed any change in performance through this.

DIGItonium · 05-17-2011, 11:59 PM

Did you look up the code to see what other problems might be? It's probably more than just the O2 sensor, but something cause it to get fouled up.

A 350Z owner mentioned replacing a MAF and O2 sensor.

Quote:

"AF sensor 11 range/performance problem"
Probable causes:
1 - Excessive rich or lean condition
2 - Exhaust leak near sensor
3 - Failed AF sensor

Quote:

Air fuel ratio (A/F) sensor 1
Air fuel ratio (A/F) sensor 1 heater
Fuel pressure
Fuel injector
Intake air leaks

takjak2 · 02-28-2012, 03:50 PM

Another O2 sensor in and the same SES light has been around. It definitely does not affect performance, I just want them to try and get it right before the first warranty expires. They ordered a new ECM which will be here Thursday.

If they can't fix it I'll just go uprev and delete the damn thing.

gaveup · 03-12-2012, 04:33 PM

So what happened?

My car currently has this. Its annoying erasing it every couple hundred miles.

takjak2 · 03-12-2012, 10:28 PM

ECM didn't fix it, came back on 34 miles later. Might have them keep trying, since it's warranty work anyways or will just delete with uprev after I make the jump in classes next winter.

gaveup · 03-13-2012, 10:36 AM

Quote:

Originally Posted by takjak2

ECM didn't fix it, came back on 34 miles later. Might have them keep trying, since it's warranty work anyways or will just delete with uprev after I make the jump in classes next winter.

Just a thought if I were in your shoes, I'd lemon law the car.

05-01-2011, 11:05 PM	#1 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	P2A00 woes. O2 sensor... again At ~19k miles my car threw this code, reset it multiple times, and had the O2 sensor, as specified in in service manual, replaced under warranty. No more SES light for almost 3k miles. After some rough driving it came again and I took it to a different dealership. They again replaced an O2 sensor under warranty, noting that the wire had "been stripped"/abraded some (that could have been me) and that it looked jarred (sounded to me like a poor install the last time?). Supervisor said that should fix it but "if it comes up again we'll have to look at the fuel system" [implied sender]. Another thousand plus miles no SES light. There was a P0400 code (I think that's what it was), same as others with aftermarket exhausts or test pipes except that mine is entirely stock nismo. Reset it, saw it again after a hundred miles, reset it, and have not seen it for at least another 1000 miles. Now the P2A00 is back again and haunting me after a reset. Any thoughts before it goes in tomorrow? __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

05-08-2011, 12:25 PM	#2 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	No thoughts? Stuck in Army training for another two weeks before I can get the dealership's take. __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

05-16-2011, 10:06 PM	#3 (permalink)
370zproject A True Z Fanatic Join Date: Jul 2009 Location: Memphis Age: 34 Posts: 16,104 Drives: 09 A/T 370z blue Rep Power: 52	bump __________________ Brake Upgrade Package ate blue, hawk hp ceramic pads, and slotted rotors

05-17-2011, 08:44 AM	#4 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	How does your car behave with the failed O2? How does it affect acceleration? Engine roughness due to weird fuel trimming? Just wondering... thanks! __________________

05-17-2011, 07:52 PM	#5 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	I believe this sensor does not affect the ECU, just a warning/indicator/emissions. I have not noticed any change in performance through this. __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

02-28-2012, 03:50 PM	#7 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	Another O2 sensor in and the same SES light has been around. It definitely does not affect performance, I just want them to try and get it right before the first warranty expires. They ordered a new ECM which will be here Thursday. If they can't fix it I'll just go uprev and delete the damn thing. __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

03-12-2012, 04:33 PM	#8 (permalink)
gaveup Enthusiast Member Join Date: Aug 2010 Location: Tamarac FL Posts: 324 Drives: 10 Nissan 370Z MB M6 Rep Power: 180	So what happened? My car currently has this. Its annoying erasing it every couple hundred miles. __________________ 2010 Magnetic Black Metallic 370Z 6M stillen gen 3 CAI - topspeed test pipes - invidia gemini CBE - UpRev tune 301whp (HP Logic Mustang Dyno)

03-12-2012, 10:28 PM	#9 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	ECM didn't fix it, came back on 34 miles later. Might have them keep trying, since it's warranty work anyways or will just delete with uprev after I make the jump in classes next winter. __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
fuel gauge woes	houkouonchi	Nissan 370Z General Discussions	38	06-05-2013 07:17 AM
CEL Code - P2A00	evse82	Intake/Exhaust	21	03-01-2012 05:53 PM
Retread Woes	PJRabbit	Nismo 370Z	7	11-16-2010 01:50 AM
Throwing code P2A00 after installing stock cats	ArtVandaleigh	Engine & Drivetrain	8	11-03-2010 05:48 PM