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John in Nashville

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  • First Name
    John

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  • Gender
    Male
  • Lexus Model
    LS400, ES300
  • Lexus Year
    2001
  • Location
    Tennessee (TN)

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  1. Thanks! Bought 234-9021 on Amazon and installed it within 10 minutes. Had to jack the car up and then reach from underneath near the front driver wheel side. Had luck with a large adjustable wrench. My funny story: I originally was lazy in my research and ordered an oxygen sensor (234-4137). Without thinking, I installed it on my car and then realized the plug had the wrong connector. Thinking I was so smart, I removed the old connector and installed it on the new plug (the pins are removable by lifting the plastic tabs inside the connector). When it didn't clear the CEL, I found this posting and the reference to Air/Fuel ratio sensor part 234-9021. Thank you! Here is what happened and how I fixed it. I thought I would post for others to learn from. The P1135 was from a failed heater element in the upstream o2 sensor on the rear of the engine. It is a 2001 ES300 with 65,000 miles. I bought a Denso 234-9021 sensor from Amazon ... the best deal I could find and was $98 delivered. I let the car cool over night and in the morning started it and backed it out of the garage to make room to work around it. I didn't know if I was going to jack the car up and work underneath. I sprayed some liquid wrench on the sensor and let it set while I rounded up a 22mm open end wrench. The elecrtical plug was not too difficult to separate. You can only get one hand to it from the top so you have to press the release tab in real hard with your thumb and wiggle the connector appart by pullung down on the connector and wires for leverqage with the rest of your hand. I got it in a few seconds. I put the 22 mm open end wrench on the sensor from the top and it was too hard to break loose. I positioned the wrench to the left side of the vehicle and got a short pipe and mallot and put the pipe on the other open end of the wrench (slipping one side into the hole) and gave it a couple raps with the mallot and the sensor broke free. After that it was simple to change out and plug the connector back in. The sensor came with some anti-seise compound for the threads. I was done in 15 minutes. I had to use a reader to re-set the engine light. I don't know if it would clear on its own. I hope this helps someone. I find tips here help me.
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