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Merry Christmas...Happy New Year! Have a safe Holiday!!!

I recently replaced the Air/Fuel ratio sensor and thought I would consolidate all the info I found as well as my experience into one post for future reference. 2000 RX 300 with 119,000 miles. Symptoms pre-code or CEL: One morning I noticed the RX was idling really high when cold. More than the normal increased cold- idle, it was up around 1700-1800rpm. After driving 5 miles to work, the idle was still a bit higher than normal. Later that evening the idle was back up to the 1600-1700 for the drive home. No CEL yet. Exact same thing the next day, still no CEL. Wife took the car that evening to run an errand (of course) CEL comes on. Read the code , P1150 front bank air/fuel ratio sensor. After searching the site it was revealed that this is the sensor right in front(yes!). Just past the radiator/fans sticking out of the front bank exhaust manifold with wires coming out of it. Re-set the code and took the car to work again and begun searching for a replacement part, ide was still a bit high. My semi-local Lexus dealer, 30 miles away quoted $250 for the part. My uncooperative Toyota dealer 4 miles away wouldn't quote me a price for a part to put in a Lexus (a$$holes). Cliffs notes version, after checking the usual Sewell, Park Place etc I found the part at www.factorylexusparts.com for $160. This is actually a shell site for Lexus of Roseville CA. I had to pay shipping AND tax but it still came in under $180. Part Number Toyota 89467-48011 or Denso 234-9009 I went with the Toyota but you may be able to find the Denso for about 10-15% less Doing the replacement was quite straightforward. Some folks noted that they had a hard time getting the old sensor out. Some even mentioned they had to heat the whole area up with a torch to loosen the sensor. I got mine out fairly easily using an 8 inch adjustable (crescent) wrench and a 3 foot length of 1" steel pipe to use as a breaker bar. Snug up the wrench around the sensor, attach the bar and a good tug yielded the satisfying pop of the nut breaking loose. Unscrewed the sensor the rest of the way and inserted the new one. The hardest part of the whole operation for me was (as usual) the fact that this car is made to be worked on by midgets. No offense to midgets (or little people) but normal human male hands are a severe hinderance when working on these vehicles. I had a particularly difficult time releasing the quick-release connector connecting the old sensor wires to the wiring bundle. After that though is was cake. So far, everything is running fine.