What to do if a limited auto warranty is not being honored?

Question Details: I bought a vehicle and I'm still within warranty until the end of this week. Theres a light regarding low air pressure. The salesman and finance cashier assured me this issue would be taken care of , tht II just needed to call and set an appointment. The mechanic stated they wont fix the issue it's not under warranty all he would do is put air in the tire (it's a censor issue). What can I do legally to get this issue resolved without coming out of pocket for something that was guaranteed to me?

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