Passenger Side, top of rear valve cover
The PCV valve for a 2000 Lexus rx300 is on the passenger side of the engine. It is on the valve cover near the back.
The PCV valve on a 2002 Lexus RX300 is located on the passenger side of the car underneath the hood. The valve will be on the rear valve cover.
Passenger side of engine on the rear valve cover.
The PCV valve is located on the passenger side rear valve cover. Simply pull it out then pinch the clamp to release the valve. I would recommend replacing the PCV valve grommet while you're in there, they get hard and brittle and can break into pieces that fall inside the engine.
The underside of the throttle body.
The PCV valve should be located on the drivers side rocker cover near the front
My Lexus dealer in Tucson AZ quoted me $712.00.
should be on top of valve cover This picture will help you find the PCV valve http://www.clublexus.com/forums/es300-and-es330-forum/418700-2001-lexus-es300-pcv-where-is-it.html What you really need to know is that if your engine has been desludged the L shaped plastic PCV valve would have been replaced with the metallic, straight screw in PCV valve first introduced in 2002.
Rear valve cover, passenger side.
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Lexus manufacturer recommend replace timing belt on Lexus rx300 every 105,000 miles.