Where is bank 1 sensor 1 for 02 Rav4?

Question

P1135 code. driver side or passenger side?

Answer 1

Bank 1 is always where the number 1 cylinder is located, Sensor 1 is the upstream 02 sensor which is before the catalytic convertor. Being a Rav4 you only have 1 Bank

​ Here the First 02 sensor is Sensor 1 this is the upstream 02 sensor , the one on the bottom is Sensor 2, Sensor 2 are catalytic  monitor sensor, or the downstream sensor

Read more :https://www.autocodes.com/p1135_toyota.html