Lexus Repair Questions? Ask a Mechanic for Answers ASAP
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P1155 is bank 2 sensor 1 air fuel ratio sensor malfuction. That is the sensor in the exhaust manifold closest to the radiator. When replacing make sure you use a foctory Denso sensor. The part number from Lexus is 89467-48011, and will cost around $200.
Make sure to spray the threads with some penetrating oil and let it sit for a while. Then before loosening tighten it just a bit to help break the rust free.
I hope my answers are helpful for you with your check engine light. That is a very common problem on that model. If you have any more questions you can post them here or request me at any time.
What is the name of the part under the vehicle shaped