P2A03 A/F Sensor1 Bank 2

Katana29 · 01-24-2021, 11:01 PM

I've got this code for one of the up-stream A/F or o2 sensors (not sure if there is a difference).

Previous owner installed Fast Intentions long tube headers and I'm not sure where that leading o2 senor would be.... the cats get eliminated and it looks like the upstream sensors are too.

I managed to grab screen shot of the voltage readings of all 4 sensors at idle and the short term and long term trims for both banks (both attached below).

2 concerning things-

-bank2 sensor2 varies hardly at all compared to bank1 sensor 2.
-short term fuel trim for for bank 2 was 21.1% compared with 4.7% for bank 1.

Thanks for looking and I appreciate any help with this.

SouthArk370Z · 01-25-2021, 05:57 AM

"Sensor 1", "upstream", and "A/F" all refer to the same O2 sensor - the one before the cat.

Katana29 · 01-25-2021, 01:45 PM

Gotcha. So on Fast intentions LTH where is that sensor located?

SouthArk370Z · 01-25-2021, 07:49 PM

Quote:

Originally Posted by Katana29

Gotcha. So on Fast intentions LTH where is that sensor located?

I don't know. Should be pretty easy to spot once you get under the car.

redondoaveb · 01-25-2021, 07:56 PM

Quote:

Originally Posted by Katana29

Gotcha. So on Fast intentions LTH where is that sensor located?

From FI website

Rusty · 01-25-2021, 08:07 PM

The front 2, O2 sensor wires that have to be extended with the LTH's. FI supplies the wires with the LTH's to do this. Check the wire connections where the extended wires were spliced in.

Katana29 · 01-26-2021, 10:35 AM

Thanks for the pic I saw that on the website

And yeah I was underneath it to change the manual trans oil but I didn't look very closely at those sensors. I couldn't tell if the white wires were the leading ones or if the black wires were and FI didn't specify in the pic.....

They look like they hook into same spot almost so I wasn't sure. But looking at it I think the black wires are the leading ones.

And I have the stock headers that still have the o2 sensors in them so i might give those a try.

370DriftZ · 04-06-2022, 10:43 AM

Quote:

Originally Posted by Katana29

Thanks for the pic I saw that on the website

And yeah I was underneath it to change the manual trans oil but I didn't look very closely at those sensors. I couldn't tell if the white wires were the leading ones or if the black wires were and FI didn't specify in the pic.....

They look like they hook into same spot almost so I wasn't sure. But looking at it I think the black wires are the leading ones.

And I have the stock headers that still have the o2 sensors in them so i might give those a try.

Any update?

Spooler · 04-06-2022, 12:43 PM

That is the drivers side first O2.

01-25-2021, 05:57 AM	#2 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	"Sensor 1", "upstream", and "A/F" all refer to the same O2 sensor - the one before the cat. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

01-25-2021, 08:07 PM	#6 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,862 Drives: 2011 Nismo GM 6M Rep Power: 2684436	The front 2, O2 sensor wires that have to be extended with the LTH's. FI supplies the wires with the LTH's to do this. Check the wire connections where the extended wires were spliced in. redondoaveb and Katana29 like this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

04-06-2022, 12:43 PM	#9 (permalink)
Spooler A True Z Fanatic Join Date: Jun 2014 Location: Ga Posts: 13,512 Drives: 2013 Nismo 370z Rep Power: 2684391	That is the drivers side first O2. abm89 likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
p2a03	Justin1686	Engine & Drivetrain	6	07-27-2018 07:02 AM
Bank 1 O2 Sensor	Gixxerman	Intake/Exhaust	8	12-29-2016 07:15 AM
SES code P2A03	kittens	Nissan 370Z General Discussions	2	05-23-2016 03:46 PM
p2a03 CEL code	inf3kted	Engine & Drivetrain	7	11-30-2015 02:16 PM
skyline vs bank	veightkiller	Other Vehicles	18	10-07-2009 02:45 PM

01-25-2021, 01:45 PM	#3 (permalink)
Katana29 Base Member Join Date: Aug 2020 Location: Florida Posts: 89 Drives: 2009 370Z Rep Power: 4	Gotcha. So on Fast intentions LTH where is that sensor located?

01-26-2021, 10:35 AM	#7 (permalink)
Katana29 Base Member Join Date: Aug 2020 Location: Florida Posts: 89 Drives: 2009 370Z Rep Power: 4	Thanks for the pic I saw that on the website And yeah I was underneath it to change the manual trans oil but I didn't look very closely at those sensors. I couldn't tell if the white wires were the leading ones or if the black wires were and FI didn't specify in the pic..... They look like they hook into same spot almost so I wasn't sure. But looking at it I think the black wires are the leading ones. And I have the stock headers that still have the o2 sensors in them so i might give those a try.