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^if your pressures are fine, then one of your tire pressure sensors has crapped itself.
One of mine died and every time i go on a long trip, the light comes on.
I second that, when I drove my car home after purchase, the light came on. I had a 100 mile trip back home. Took it to the nearest Nissan dealer and they told me it was a bad sensor, Bastards charged me $108 just to tell me it was a bad sensor.
Complained to dealer I bought it at, since this happened immediately they replaced all 4 sensors and they reimbursed me my $108. Luckily I worked at a tire shop and I replaced the sensors myself when I upgraded to aftermarket wheels.
There are actually two warnings, the TPMS warning looks like (!). The low brake fluid warning looks similar but the exclamation is enclosed in a full circle (Ø). Check your brake fluid while you're checking your tire pressure.