One usually heats the sensor (power) the other is a ground and they other sends the ohms of resistance to the computer, measuring exhaust air density, adjusting the fuel and ignition while you drive.
SOURCE: How many O2 sensors on a 1997 Lexus ES 300?
according to the manual i have... it has three.... one in the exhaust manifold.... and two in the exhaust pipe..... slightly vauge on the exact location of the last two sensors... but looks like it is after the catylitic converter.
SOURCE: code p1130. where is the sensor located
P1130 Air/Fuel Ratio Sensor Circuit Range/Performance Malfunction (Bank 1 Sensor 1)
This sensor is the hardest to get at. It is between the cat and the cylinder block on the bank of cylinders closest to the firewall. Not much wiggle room back there.
Sensor will run you about $225 from Toyota, $275 from Lexus, but you may be able to get a Denso sensor on line.
Good luck and hope this helps. keep me posted.
SOURCE: ? to Replace Timing belt on 2000 Lexus Rx300 with 57,000 miles.
If it is running perfectly I wouldn't think that you would need to replace the timing belt. You shouldn't need to replace that until 100,000-120,000 miles. I would definitely hold off until now unless you have start having some timing problems. Let me know if you have any other questions. Thanks for rating my response and for using FixYa!
SOURCE: replace side marker light on lexus rx300
Remove 3 - 4 screws on fender cover close to side marker light. Pull fender cover out a bit for you to use your other hand to reach side marker light. By twisting on one direction and here you go the light out. Replace new bulb and replace everything on reverse order.
SOURCE: where coolant temp sensor location for lexus rx300
coolant temp sensor is located on the bootom backside of the radiator. you will have to remove the front under cover to access it.
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