The check engine light of my car is on. I went to Autozone and got a troubleshooting code P0050. The guy in Autozone told me that it's the oxygen sensor (bank2 sensor1). However, I read a repair manual from internet saying it's bank1 sensor1. Does anyone know which is correct?

Another question is, when I check the parts availble in Autozone, there are different oxygen sensors. Some are for left side while some others for right side. Does left side mean passager side?

Any response is welcome. Thanks!

PS. My car is a 2003 Audi A4 Quattro 3.0

 

H02S Heater Control Circuit (Bank 2, Sensor 1)
(heated o2 sensor)

 

So the oxygen sensor is alright. I will need to figure out what wrong with the control circuit, right?

 

no the o2 sensor is bad and needs to be changed. you need to change the passenger side pre-cat o2 sensor.