TPMS inside tire is beeping ?

[RonCT]

A Porsche race shop finished mounting and balancing a set of PSCs on oem 18s for my 997S and discovered that inside one of the 4 tires one of the TPMS sensors is beeping. They are contacting the dealership where the sensors came from, but I thought this would be an interesting technical question / answer for the forum. I'll post what happens, but in the mean time if anyone has experience with why this might be or what the solution might be, I'd love to hear it. Theories of mine are that there's a back-up batter inside the sensor to send signal to the car. Much like a smoke detector, if the battery is low, it might chirp to let you know you need to change it. It would be cool if the TPMS generated its own power much like a self-winding watch does and the back-up battery is simply low. Just curious - I never thought they'd put a beeper inside the tire sensor...

Ron

Friendly RennLister provided this link to the maker's web site - lots of cool info:

http://www.beru.com/english/produkte/tss.php

Edited March 9, 2007 by RonCT

[RFM]

Hi

I never heard a TPMS sensor beeping. There is a battery inside, when new approx. 80 months, they give a signal to the antenna inside the wheel arch. If the battery is to low or the sensor is faulty-broken, you got a message on the dash. If you install a new sensor it is much easier to put-in the new code with a PIWIS, it can take a long period of driving before the system is learning by himself, sometimes even not.

[bjcarrera]

Is the TPMS option something that can be added as a reto-fit, my car does not have it?

[RFM]

Hi

I' m not sure, but i don't think so. You need a new wiring, control unit, sensors, antennas and a lot of labour.