P2A00 - A/F Sensor Circuit Range/Performance (bank 1 sensor 1)

jwick

It happens. I'm actually going to remove my post cats too as it appears to make the idle AFR better.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

GaleForce

I had this code with the base map. My tuner said this was a common issue with a turbo'd 370z. They smoke tested the intake and a predyno checkout, everything checked out a-ok. They ended up disabling the P2A00 code in my final tune.

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jwick

Good to know. I emailed JTran to see what he thinks we should do.

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'10 G37T 6MT Graphite/Graphite - BP - G37T Build

GaleForce

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BBRSpeedWorks

after you get rid of the cat there pointless...

Jordo!

I think both those values are within range.

You want to log MAS A/F -B1 (V), MAS A/F -B2 (V), A/F WB-B1 (V), A/F WB-B2 (V), A/F ADJ-B1, and A/F ADJ-B2. I'd also log INJ PULSE-B1 (ms) and INJ PULSE-B2 (ms).

It's also worth logging MAF voltage for both banks just to confirm you don't have something wonky going on that far upstream.

Unless you have a specific physical symptom where you can narrow down when the problem crops up (e.g., stumbling at idle), once up to normal operating water and oil temps, I would try datalogging at idle, low load/cruise, and maybe one pull to redline in 2nd gear.

Unless the way things are plumbed for the turbo are causing Bank 1 to just suck more air than Bank 2 (it's possible -- and if so, then you'd need to apply fuel correction to Bank 1 cylinders via uprev tune), it could be a bad sensor, a vac leak, sticking injectors, or a fouled or cracked spark plug -- in other words, un-metered air slipping in, failing injectors, or a bad plug can all result in a lean condition, or at least cause the ECU to think you're running lean.

The code you got points to bad O2, but really it just means that the bank stays leaner than targeted longer than it should, so any of the aforementioned could cause that.

The datalog (as well as inspecting for vac leaks and checking out the spark plugs) should help clarify -- good luck!

EDIT: Also, yes, it's a bit like the random misfire code -- you can get this code and not have any actual issues, meaning its a detection logic problem, possibly aggravated by changing things around for the turbo. If everything looks good, all values are in range, no loss of power or evidence of knock, then I agree -- just switch it off. Definitely confirm all is good first, tho'.

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09 Nismo#400

I have also disabled this code (P2A00) in my tune, and I have not had any problems with it off.

gomer_110

Same here.

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'17 Titan Bone Stock

puckshaw

I have this code and a random misfire code occasionally. I've barely been driving the car and was still searching for a solid fix. Planning on replacing the sensor soon but don't have a lot of confidence that will fix the issue. May wind up just disabling the code as others have done.

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jwick

Did you start getting the random misfire code after you upgrade the clutch/flywheel. As I understand it the sensor is so sensitive that the chatter of the tranny and lightweight flywheel, along with a higher than stock idle rpm, will set it off. I got that code when I first installed the kit. I had my tuner turn down the sensitivity on the sensor that trips that code and I've had no issues since. If I recall properly he just lowered the sensitivity under 1500 rpms.

Sounds like I'll disable it too if I can't find an actual cause. I'm going in for a retune in a couple months anyway so my tuner will have a few days to play with it and get it dialed correctly.

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Liquid_G

I had this exact same code last year. GTM Stg1 SC. turned out to be a bad injector. one was barely firing and the others were dumping a **** ton of fuel to compensate. Might be worth looking into.

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Mitco39

Keep in mind Jwick that most if not all tuners turn off the misfire code. So if one cylinder is misfiring you wouldn't otherwise know it. When I turn on my launch control I cut fuel so that cylinders misfire, the with that code off thinks everything is just fine.

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jwick

Mine isn't turned off. JTran just reduced the sensitivity of the random misfire portion below 1500rpms. I haven't had that code pop up since he adjusted it. The rest of the misfire codes are still OEM settings.

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Mitco39

But is there a chance that your issue lies below 1500rpms?

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jwick

Maybe I'm missing something. Only the random misfire code was messed with. The other individual cylinder misfire codes are still active. If I had a true misfire wouldn't a specific cylinder code pop up?

It is possible my issue is below 1500rpms, and I was below when it tripped the code this time around. The code popped up when I pulled up to the stop light and the idle hiccup happened (BP guys know exactly what I'm talking about). I had just left the work parking garage so the car wasn't really warm yet. The rpms dipped lower than on a 'typical' hiccup and the code came on. My thought is as it stumbled (hiccupped) the rpms dropped lower than normal and left it in a lean AFR state that tripped the code. All the parameters I've checked are spot on. All the bank readings are the same for each parameter except the sensor heater voltage (which Bank 1 is about 25% lower than Bank 2). Car runs find, idles fine, and in slight boosting applications it operates fine. I've not given it a WOT until I can absolutely confirm everything.

I picked up a new can of carb cleaner and I'll check the intake piping this weekend.

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