One of my tires is low so I simply added air. None number of the pressure has not increased and the light is still on. Any idea on how to reset?

 

I believe it will reset on it's own after you drive a bit.

 

Yes, it will eventually re-set itself. How long it takes could vary, depending on where the car's computer is in the cycle of checking various systems on the car. If you don't want to wait for that to happen, you can stop at any of the chain auto parts stores, like Advance Auto, Auto Zone, etc. Most of them will let you borrow their OBD II code reader. Just take it out to the parking lot and hook it up to the car's OBD II port. When it shows you the trouble codes, ti will give you the option to clear those codes. Also, if you have access to TechStream software, it will allow you to see and clear and codes.

You could also try using the TPMS re-set button that is below the dash, but I'm not sure whether it works with re-setting the system after low pressure has been detected in a tire.

 

Agreed. I just cleared my pressure warning by adding air, but I had to get the car up to about 15 mph before the new pressure registered on the dash and the error cleared. Odd that all four sensors were showing 33 psi but only one showed a red alert condition. I normally keep them at the mfg recommended 35 pounds so I’m not sure why they were so low - must be the weather changing. Anyway, I was surprised that 33psi would trigger the alert. I would have expected something lower - like 30 psi before it triggered an alert. I suppose the earlier alert is better and allows more time to get some air added though.

 

I thought 30 psi was the magic number but perhaps not the case. In any event, remember you will lose roughly 1psi for every 10 degree drop in temp.