danfall

Kashi - Thanks for the additional information on how to reset the lights. I knew that after I put in the new sensor there had to be an additional step to reset the lights. Just didn't know what it was . Now the procedure is complete. Thanks.

The problem is fixed!! :D A BIG thanks to Mr. Kashi125, or should I say Dr. Kashi for all your valuable insight! Where do I send the Lobsters? To recap, my 2001 Lexus ES300 with 59K miles failed the 2009 Massachusetts Auto Inspection test. The code I got was P1155 only. ( Not P1155 AND P1135 which suggests a different sensor location I believe; the Dr. may care to comment). With the guidance of Dr. Kashi ( see his previous posts in this same thread) I purchased the DENSO 234-9021 sensor Monday morning on Amazon for $130 (including shipping) and to my surprise it was delivered Tuesday afternoon. The location of the sensor in the engine compartment is shown below: The old sensor is the one on the right in the following photo: Using a 22 MIL open end wrench I was able to loosen and remove the sensor from the manafold easily (your experience may differ ;) ). After that I simply unplugged the connector by pressing on the right side of the female connector housing (facing you in the photo below......ok this is getting to detailed ;) ). After that I installed the new one. I started the engine and initially both lights came on :cries: ( bummer!!). I let it run for about five minutes. I then shut the engine off, waited ten minutes and started it back up and the lights were off. :D

Thanks for the information. I went ahead and ordered the part from Amazon. Hopefully it will show up in the next three days or so and I can install it. Will let you know how I make out. Thanks again

I have the same problem with my 2001 es300. Was wondering what your outcome was? Could you update us all? Danfall4

No, didn't hear back from the OP. What code(s) are you getting? I get the P1155 code only and I have the two lights on showing up on my dashboard as others have stated. I've read a lot of the posts up here on the topic and from what you've posted it appears I need to buy a specific sensor determined by my VIN number. I'm away from home at the moment but tomorrow i can furnish you with my VIN in determining what exact part number i need. I would be appreciative. Thanks, Danfall4

Ever here back from the OP? Wonder how he made out? I have the EXACT same problem with my 2001 es300. Would like to know which part number I need based on my VIN. Anyone know how to determine this? danfall4