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

Jordo! · 08-21-2014, 06:32 PM

Quote:

Originally Posted by 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.

You wouldn't necessarily get a cylinder specific code.

When does the stumble hiccup happen? That may give a clue. When datalogging (or reviewing it later) take note of what the voltage readings are doing, as well as load and TP.

I think the heater correction is normal for both -- the difference may or may not reflect anything.

Once you confirm no vac leaks, no bad spark plugs, and injectors are working fine, all that's left is to check the O2 sensor (or just replace -- Denso p/n is 234-9104), wiring, and connector. If all is good then assume its just bad detection logic until a clear symptom presents itself.

You should be able to narrow it down between cipher and checking those few specific mechanical issues.

Finally, if the problem is consistent and can be narrowed down to a specific load range,you can always tweak the Bank 1 fueling in uprev.

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