Underneath lower intake manifold in the valley between the heads.
These sensors are available on EBay for ~$70
Underneath the lower intake manifold, in the valley between the cylinder heads.
Tune up for 1999 rx300 Lexus
adjust headlight
Your engine block is the main part of your engine that holds the crankshaft and pistons internally. Your knock sensors, there are two, are screwed into the top of the engine block in the valley between the cylinder heads. You don't have to remove the engine block, you do have to remove the upper and lower intake manifolds to get to them. I changed the sensors in my 99 rx300, long day!
It is in the fuel tank.
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.
Passenger side of engine on the rear valve cover.
It's attached to the throttle body.
3000 RPM