How many O2 Sensors does a Toyota Avalon 2001 have?

Question

I got code P1153 on my Toyota Avalon 2001. This code refers to Oxygen Sensor Bank 2 Sensor 1.

How many O2 sensors are?
Where are they located?

Thanks in advance for your help.

Answer 1

Hi there,

in total there are 4 O2 sensors, two on each bank, 1 before the converter and one after.

The code you refer to is as you stated, bank 2 sensor 1 so this is the first O2 sensor on bank 2. Sensor 1 is always the sensor before the catalytic converter. Here is a diagram, it's the first sensor on the bank closest to the radiator.