on each exhaust manifold there are Air Fuel Ratio Sensors. these are before the catalytic converters. after the converters, there are 1 or 2 Oxygen Sensors. i believe the 99 has 1 held by 2 12mm nuts about even with the driver's seat under the car.
the connector is under the driver's seat.
These sensors are available on EBay for ~$70
It is in the fuel tank.
Underneath lower intake manifold in the valley between the heads.
Tune up for 1999 rx300 Lexus
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.
adjust headlight
lexus rx300 1999-2003
It's attached to the throttle body.
Passenger side of engine on the rear valve cover.
3000 RPM
locate cylinders 2000 rx300?
You need to charge or replace your battery