What's that big exclamation point on my Dashboard?

I am seeing a lot of web searches coming in for "dashboard exclamation point", so I decided to update this classic post.

Now that the temperature is dropping, a lot of drivers are noticing a new symbol which might have appeared in their dashboard. It looks something like this...

That huge exclamation point certainly looks scary, But don't worry,  this symbol is actually and alert for your cars Tire Pressure Monitoring System, (TPMS) kicking in.

When is gets colder outside, air contracts and reduces your tires air pressure (PSI) slightly. Usually, the reduction is not enough to be dangerous, but certainly enough to trigger the sensor.

How do you fix this problem? First, don't waste your money going to a mechanic. Go check your tires recommended PSI, (usually inside driver-side door) fill it up, and wait for the sensor to eventually turn itself off when driving. Don't fill it to the max psi rating that's printed on the tire.