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Old March 17th, 2010, 06:11 AM   #21
GreaseMonkey
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Some vehicles that currently have indirect ABS-based TPMS include 2001 to 2003 Ford Windstar, 1997-2002 Buick Park Avenue, 1999-2003 Buick Century & Regal, 2002-2003 Buick LeSabre, 2003 Buick Rendezvous & Aztek, 2000-2003 Chevy Impala & Monte Carlo, 1999-2002 Chevy Alero, 1999-2002 Pontiac Grand Am, 1997 - 2003 Pontiac Grand Prix, 2000 - 2003 Pontiac Bonneville, and 2001-2003 Oldsmobile Aurora.

Tire pressure monitor warning

As for the direct TPMS systems, they have their own technical issues as well. One is battery life. The pressure sensor inside each wheel contains a small battery to power the sensor and transponder. Most are long-life lithium batteries that may last from five to 10 years. Eventually, though, the batteries will go dead. On the Corvette and Cadillac applications, the battery can't be replaced separately so the sensor/transponder must be replaced as a unit. If a battery has died, it's probably a good idea to replace all the TPMS transponders if the vehicle is more than six years old. Some of the older Corvette systems use a piezo device inside the pressure sensor that generates current for the sensor. This eliminates the need for battery or sensor replacement.
So what's the difference between direct and indirect?
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Old March 17th, 2010, 11:43 AM   #22
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So what's the difference between direct and indirect?
One is on the valve stem itself and can read each tire pressure and the other doesn't read each pressure is just sense a low tire adn the light comes on.
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Old March 17th, 2010, 11:47 AM   #23
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One is on the valve stem itself and can read each tire pressure and the other doesn't read each pressure is just sense a low tire adn the light comes on.
I wasn't aware of the two different types of sensors. I know some vehicles come with just the system, and others come with displays where you can read actual pressures. I always assumed the sensors were the same, but the receiver was different.

Learn something new every day, thanks.
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