I would guess that one of the tires has a slow leak. I believe the low-pressure light comes on when the tire pressure is 25% below the recommended tire pressure. This is typically not going to happen around here from temperature changes as 10 degrees of temperature change typically results in a 1 PSI pressure change. In other words, a couple of PSI change from temperature variations isn't enough to trigger the low pressure light unless the tire has a leak and is therefor not near the recommended pressure. I don't know how long you are planning on keeping the rental car but I would suggest the following: have the tire pressures set to the recommended values and if the tire pressure light comes on again call Thrifty and ask for a replacement rental car.
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Originally Posted by Schaumburger
Thanks for the info. about Wal-Mart. I called Thrifty Car Rental's roadside assistance number, and the person on the phone said the drop in temp. may be causing the sensor light to come on. If the sensor light is still on tomorrow morning, I will take it to the Wal-Mart on 441/27 to have them check the tire pressure.
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