P0135 -2003 toyota sienna

Question

Hi, I got code P0135 02 Heater Circuit (Bank 1, Sensor 1). I dont know which sensor to buy. I dont which sensor needs to be changed. I have no idea where sensor 1, bank 1 is. Please help. I think i'm supposed to buy...Denso 234-9021 Oxygen Sensor, but i'm not sure.

Answer 1

Hi there,

Bank 1 is the bank closest to the firewall. Sensor 1 is the first sensor BEFORE the catalytic converter. This may also be listed as the upstream O2 sensor on the left side of the engine.