The reference to bank 1 suggests that the sensor is located on the side of the engine lasting to the cipher 1 cylinder on the 2003 IS300. In this position, the engine is a straight six-cylinder engine, which method that the digit 1 cylinder is the forward-most cylinder following to the radiator. The IS300 has a split manifold; the inceptive three cylinders exhaust ended the forward half and the persist three over the back half. The engine should be allowed to frosty prior to utility the O2 sensors, by reason of they are in the exhaust development, which is indubitable fevered. Install the new sensor by threading it into the manifold clockwise as far as possible by hand. Tighten securely with the wrench. Connect the electrical harness connector.
2. Look closely at the exhaust manifold on the passenger side of the engine.
3. Notice how the exhaust is segmented. There are two pieces -- each containing three exhaust pipes. The bank one sensor is located in the forward-most manifold and is the highest sensor toward the top of the manifold.
To remove the sensor, first unplug the electrical harness connector. Remove the sensor by turning it counterclockwise using the wrench. Owing to it is baking, everything is expanded and whether the sensor is taken outside when the engine is febrile, it may appropriate the threads with it.
