Question on TPMS

[Highlander]

I was reading the official Porsche Service sheet for my '07 Boxster S and it mentions "Check battery for the tire pressure monitoring system"

What exactly does this entail?

 

Thanks.

[Loren]

Each wheel transmitter has it's own battery.

Per Porsche "The battery capacity exhausted, service life approx. 5 to 10 years"

 

Sorry, I do not know if PIWIS can actually read each battery level or not. Even if it could all it takes is one bad and you know the rest are on their way out. Since you have to unmount each tire to install new transmitters I think you might as well do them all at once.

[Highlander]

Thanks Loren.

 

So the battery is not replaceable?  You have to install new transmitters?  Porsche has been reading Apple's design guidelines... :)

[Loren]

Correct, they are a single - all enclosed unit.

If you buy aftermarket make sure they will work and the correct frequency (433 MHz for US Canada cars).

[RFM]

PIWIS can read the specific live of the sensor/battery, anyway the sensors can give erroneous information already, concerning the tire pressure, to one half of the specified service life. I would advise to replace the sensors when some abnormalities arise between the reported, on the dash, and the actual measured pressure, with a tire pressure gauge, on one or more wheels.

[Highlander]

Thanks guys.  Since I don't have easy access to PIWIS, I'll just wait until I see issues.

[JFP in PA]

Thanks guys.  Since I don't have easy access to PIWIS, I'll just wait until I see issues.

 

On a 2005 and later Boxster, the Durametric system should also be able to see the TPMS sensors.