These sensors are available on EBay for ~$70
12 mm
It's attached to the throttle body.
A/F Sensor for Bank 2 Sensor 1. It is the O2 sensor on the front manifold.
Underneath the lower intake manifold, in the valley between the cylinder heads.
Tune up for 1999 rx300 Lexus
adjust headlight
It is in the fuel tank.
To replace the knock sensor on a 1999 Lexus RX300, first, disconnect the negative battery terminal to prevent electrical shorts. Then, remove the intake manifold for better access to the knock sensor located on the engine block. Disconnect the wiring harness from the sensor, unscrew it using the appropriate socket, and install the new sensor by reversing the process. Finally, reassemble the intake manifold, reconnect the battery, and check for any error codes.
lexus rx300 1999-2003
Two speed sensors on a 1999 rx300 .One is located under air filter box,remove air filter box and sensor in located there,the other sensor in at a 45 degree angle on the transmission just behind the battery,remove the battery and tray to get better access.The sensors have the same part number and are the same.
inside the exhaust and by dissasembling and swapping it out
Passenger side of engine on the rear valve cover.