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A yellow explanation point symbol on the dashboard typically applies to the Tire Pressure Monitoring system. A thick ! inside a half drawn flat tire symbol to be complete and comes in yellow color when lit. Under normal vehicle set-up, if this indicator stays lit after the power-on selftest, you need to check your tires for any uneven pressures and adjust their pressures to correct specifications. Okay? : )
A red exclamation point inside a circle when lit indicates your parking brake is on, or your brake fluid level is low.
Ironically I had the "!" inside the "U" come on this morning as well in my 2007 M35x. Oddly this is indicating that you have low tire pressure. I suspect this is happening due to the temperature change. At least for me as I live in New England and it was very cold this morning.
That symbol is the low tire pressure light. You have a tire that is right at the minimum threshold. The light goes off as the tire temperature rises, and, as the temp rises, the internal air pressure also rises slightly. Just check the tires with a good pressure gauge, inflate them to the specs printed on the tag inside your driver's side door, and you will be just fine.
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