2005 Pontiac Grand Prix tire pressure warning light
Hi - This past weekend I stopped to check my tires before a roadtrip, as I always do, and three were low. I inflated all to 40psi. Right afterwards the "check tire pressure" warning light came on and now it comes on each time I crank my car. I checked the tires again last night and they were fine. Could this be a faulty sensor?
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Look in one of the rear door jams of the car. There should be a plate that has tire pressure settings for different tire sizes. Verify this pressure against the tires rated max pressure, it is on the sidewall of the tire in very small print. If the recommended pressure does not exceed the max pressure, fill it to that pressure. If it exceeds the max pressure, only fill it to the max pressure. This should be checked and filled with the tires cold (ex. before driving any substantial distance)
The exclamation point that you see is an indicator light to inform you that you have a low tire, if it flashes for a minute or so when you start the car that means the sensor is bad but if it is always just on that means you need to stop at the nearest gas station and put some air in those tires.
check tire pressures with a gauge and set to the specs either in door jam or in glove box. your car must be equipt with tire preasure monitoring system so the sensors are inside the wheel normally part of the valvestem.
I think that there is a button located under the dash at the right side of the steering column. To reset the low tyre pressure warning you need to press the button immediately after inflating all tyres to right pressure.
There is either a yellow button under the dash to the right of the steering column or possibly one in the fuse box. Check your manual and it will tell you for sure. If you still can't find this button, another option is to disconnect the battery and that should do it.