Gentlemen,
An extra trick you might pull is to over inflate all tires by 4 psi and then drive the car to watch for a TPMS alert. If it doesn't light up for the test drive, once home, then lower the tires back to their manufacturer's specified level.
Many of the cars I've had with TPMS over the years have driven me crazy when one tire has gone down. I saw this procedure online and since using it I've always been able to get the system to behave itself.
Gene
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