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How do I diagnose this problem? Thanks!
I have the same problem, the batteries in the sensors are dead. Each sensor is held onto the rim by a strap(inside each tire). Care must be taken when changing tires so as to not damage these sensors. Since I just bought this 2006 escape this spring 2013, next tire change I'll attempt to change these batteries, providing they're changeable.
The sensors that send a radio frequency to the computer (or receiver) are battery powered and don't last forever. I just bought a 2006 Escape this spring 2013, it has exactly the same problem. I imagine they are powered by a watch type battery and hopefully replaceable. The older sensors are held on the rim (inside the tire) by a strap while the newer ones are part of the air valve assembly. Care must be taken when removing tires so as not to damage this sensor. When tires are changed, the mechanic normally changes the valve. They use a special tool that pulls the valve out of the rim. If the mechanic is unaware that it is a sensor valve assembly, it might be a really expensive tire change if you want to keep the monitoring system!