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Where is the Airfuel sensor located in 1999 Lexus ES300 and how to replace it?
Spunkyrao
There are 3. Bank 1 sensor 1 is between the radiator and engine when you open the hood. It looks like a spark plug screwed into the header coming out of the engine, going down, and feeding into the exhaust. Bank 2 sensor 1 is between the firewall and the engine (back side of engine). It also looks like a spark plug screwed into the header coming out of the engine, going down, and feeding into the exhaust. Hard to see unless you get under the car. The 3rd sensor is on the top side of the exhaust pipe just after the catalytic converter. The connectection for this one is underneath the carpet under the driver seat. First and last are easy to replace. Trace wire to connector, disconnect, and unscrew. Remember to use anti-seize compound on the threads of the new sensor. The bank 2 sensor 1 works the same way but I haven't been able to reach the connector to get it disconnected. Its very hard to reach. Best place to buy that I found was at this link http://www.automedicsupply.com/index.php?ref=Google&stopredirect=yes&width=1024&height=768 Good luck...Let me know if you better luck than I did replacing the bank 2 sensor 1.
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