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I was having the same issue and after reading this thread I went and checked the Main/2nd button under dash on passenger and it was set in to 2nd. I pushed it to the out position of Main and verifed all tires including spare was at 33psi. Turned key on and the tire monitor light went out. Thanks for the tip on checkng that Main/2nd button on passenger side as somehow someone hit that or pushed it to the 2nd position which caused the light to come on. Problem solved