Code P0136 O2, Sensor bank 1 sensor 2 replacement?

The P0136 OBD-II Trouble Code in your 2001 Toyota Highlander refers to "O2 Sensor Circuit Malfunction (Bank 1, Sensor 2)".

Here's an explanation of what this means:

Problem: This code indicates that there is an issue with your vehicle's oxygen sensor, specifically the second oxygen sensor in bank 1. The oxygen sensors are responsible for helping the engine control module (ECM) regulate the air-fuel mixture in the engine. The Sensor 2 that the code refers to is the sensor that is located after the catalytic converter (also known as the downstream sensor).

Symptoms: Symptoms of a P0136 code can include:

The Check Engine Light coming on
Poor fuel economy
Poor vehicle performance, such as lack of power or rough running
In some cases, there may be no noticeable symptoms besides the Check Engine Light

Here is a generic guide to help you step by step with instructions in the diagrams below to show you how on your car:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

Check out the images (below). Please let us know if you need anything else to get the problem fixed.

Here is the correct sensor:

https://amzn.to/44SsHnR

Let me know how it goes.