1. Park your vehicle in a safe location and turn off the engine. Allow it to cool down if it has been running.
2. Locate the oxygen sensors on your vehicle. In most cases, there will be two oxygen sensors: one located on the exhaust manifold near the engine (upstream sensor), and the other located further downstream on the exhaust system (downstream sensor). Bank one refers to the row of cylinders that contains cylinder number one.
3. The upstream oxygen sensor for bank one is usually located on the exhaust manifold, near the front of the engine. It is typically screwed into the exhaust manifold and has an electrical connector attached to it.
4. To access the upstream oxygen sensor, you may need to remove some components, such as the air intake duct or heat shield, to reach the sensor.
5. Once you have located the upstream oxygen sensor, inspect it for any signs of damage or corrosion. If the sensor is damaged, you will need to replace it.
6. To remove the oxygen sensor, use a wrench to loosen the oxygen sensor's electrical connector and disconnect it. Then, use a wrench to loosen and remove the oxygen sensor from the exhaust manifold.
7. Install the new oxygen sensor by screwing it into the exhaust manifold and reattaching the electrical connector. Tighten the sensor until it is snug but do not overtighten it.
8. Once the new sensor is installed, reconnect the electrical connector and reinstall any components that you removed to access the sensor.
Note: It is recommended that you use an oxygen sensor socket to remove and install the oxygen sensor, as a regular wrench can damage the sensor. Additionally, it is recommended that you clear the vehicle's trouble codes after replacing the oxygen sensor to reset the vehicle's computer and ensure proper operation.
