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-   -   P2A00 woes. O2 sensor... again (http://www.the370z.com/nissan-370z-warranty-scheduled-maintenance-servicing-repairs/35728-p2a00-woes-o2-sensor-again.html)

takjak2 05-01-2011 11:05 PM

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? :confused:

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 (Post 1595849)
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.


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