P2A03 A/F Sensor1 Bank 2
 

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.

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

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.

From FI website

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.

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?

That is the drivers side first O2.