Thread: Low air pressure light keeps comming on
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Old Nov 4, 2005 | 06:30 PM
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RickB
Joined: Apr 2005
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Default Re: Low air pressure light keeps comming on
Originally Posted by typhoon55
I also have this problem but have learned to ignore idiot light as others have. Evidently the TPMS needs to be calibrated by dealer as the tire pressures are fine.

I am told there is a battery in each sensor as well that could be the problem.
The calibration by the dealer is to let the computer know which TPMS signals are for your car. Each sensor has its own unique ID that it broadcasts. Could you imagine the fun if your car was giving low tire pressure indication because it was receiving the signal from the car next to you?

The procedure involves clearing the computer TPMS memory and then placing a magnetic tool on each sensor to "turn it on" as the computer asks for it. The computer then knows its ID's for the sensors installed on your car.

Yes they have a small non-replaceable battery in each sensor, but to conserve battery life they are activated by a switch that only goes on 1) if the magnetic tool is placed on the valve stem, or 2) if the car is going faster than 20 mph. In another thread the price of about $49 was listed for the cost of the valve stem / sensor. Figure some day you'll be replacing them as the batteries go dead.
 
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