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TPMS light on dash does not go out

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I bought (4) TPMS part number 13598771 and installed them this passed weekend. I did both RELEARNing procedures - through the key fob and the procedure through the DIC. All (4) sensors are reading 30-31 PSI.
First question - is 30 psi the optimum psi to satisfy the system, if not what is the correct psi?
Secondly the light on the dash (tire cross-section with ! in middle) will not go off. Last night I disconnected the battery just to see if that would make the light go out but it did not.
Anyone know how to make that light go out? I ran it for 3 weeks and it is still on. Sensors are reading fine too.


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