so i looked online for a sec, but didn't find anything really... can someone help me? the error code is po138, and it says "o2 sensor 2 in bank 1 is too high for current operating conditions". where is this (a diagram would help lol), and what type of sensor should i buy? i saw a bunch online, but i dunno if they are all the same or if they're mounted in a different place.

 

that code is really VAG code

16522 - Oxygen (Lambda) Sensor B1 S2: Signal too High

they are all mounted in the same place, bank 1 is on the passenger side i belive, sensor two is the sensor that is after the cat.converter. basicly just follow the exhaust pipe down and you will see two sensors sticking out of the pipe, the rear most sensor, closest to the back of the car, is the one your looking for.