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Message: <blockquote data-quote="ORVietVet" data-source="post: 28462" data-attributes="member: 9438">[MEDIA=youtube]_lWLMJ_4G24[/MEDIA]I am going to be replacing the thermostat and ECT sensor on my landlord's sister's 2018 Camry XLE 2.5 hybrid, on Monday or Tuesday. Problem is related to a CEL code of P0128.The "Maintenance Mode" that I need to put the vehicle in, for the proper refill, is talked about at 9:30 of this video. The video is made by "Car Care Nut" who is a Toyota specialist and my go to guy for anything Toyota that I am unaware of. He really does know his stuff. But I have never heard of or had to deal with this Maintenance Mode. Any of you aware of this? I am not dealing with the separate coolant/cooling system for the hybrid battery. The whole video is very informative but the Maintenance Mode is new to me.Any thoughts and comments are appreciated.</blockquote>