Already replaced this part, what else could cause this?

Question

O2 sensor still getting P1135 code

Answer 1

Hi there

If replacing the sensor hasn't solved the issue, then you may have a wiring issue. It can also be a blown O2 sensor fuse on the Toyota as well. Here is some more info on the code for you.

P1135 TOYOTA - Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

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