2002 passat 2.8l v6 location of bank 2 sensor 1 o2 sensor

see if this helps. I know it's for different year model, but may lead you in the right direction.
https://www.autozone.com/repairguides/VW-Passat-Audi-A4-1990-2000/COMPONENT-LOCATIONS/Passat-1-8L/_/P-0900c152800c2d27

Sensor 2 is always located after the catalytic converter. Bank 1 is the engine bank that holds the #1 cylinder. Since the 2.0L is an inline engine with only one bank, there's ah, only 1 B1S2 sensor.

You did not post the entire code. There are two possibilities here:
P0135 O2 Sensor Heater Circuit Bank 1 Sensor 1
P2135 Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correlation

BIG DIFFERENCE!

For 1998 VW Passat V6 the fuse box is located on the left side of dashboard behind a plastic cover (for left hand steering wheel vehicle). On inner face of the plastic cover you will find the fuse diagram.
The cigarette lighter fuse for 1998 VW Passat V6 is placed in the fuse box / relay plate fascia 1, (driver's door open). See pictures below:



The fuse box / relay plate fascia 1 diagram:


Fuse no.# 33 - F33 (15 Amp.) = Cigarette lighter


Please do rate my response. Thanks!

it will be the sensor on the passenger side exhaust before the catylitic converter

look on ebay

System Too Lean (Bank 1)

Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

P0411 Secondary Air Injection System Incorrect Flow Detected, check the...Combination valve
...Secondary Air Injection pump motor
...Secondary Air Injection solenoid valve
I would take it to a mechanic

i would say the up stream o2 sensor.if you had a decent scanner you could watch the readings and know for sure.this is just and educated guess as i do not know those readings.

could be the lambda probe located on the exhaust.

depending on which engine you have. 4cly.the part is about $210 and one has 4 wires and one has 5 wires located either in front or behind cat. converter.... On 6 cly. some have 1- O2 sensor some have 2- O2 sensors depending when car was made that year and the part is about $160 each..