So, I assume you did it yourself. Am I right that it's sort of to the right as you're looking under the hood (from the front) on top of the trans? Did you have to remove the bracket that's right over it or were you able to work around it? Since I don't have a son that works at a dealership, I suppose I'll have to pay the $116 that Lexus quoted me.
Regarding the 8 days . . . I think I read somewhere that once you get over 30mph, if the problem still exists, you'll see the light come back on. You definitely fixed it. I guess the real question in your case is, "why did it go out in so few miles?" My daughter's car has 130k on it.
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Yes I did it myself. It is on the top right of the tranny. 12mm socket, and the bracket is not in the way. $116.00 is a great price. I assume from Toyota, not Lexus? not sure why it went bad with such low mileage. Should take you about 5-10 minutes to do it. Real easy. Good luck, if you have questions, please ask if I can help!