Having TPMS issues

[dphatch]

Can someone tell what system in a 997 reads the signals from the TPMS  sensor in each wheel ? I'm getting readings only from passenger side wheels. Could be sensors are bad but summer  wheel set  ( just switched over to winter set ) exhibited same issue. Could be  that  all eight sensors are dying at once but might suggest something else is amiss. Just  need to know what  the "something else" might be. 

Edited November 11, 2016 by dphatch

[Loren]

There is a control unit here

 

 

But depending on the age of your car I think the sensor/battery (one per wheel) is likely bad.

These seem to last only 5 or 6 years before replacement.

[dphatch]

Are there individual sensors in each wheel well that read the tpms and send data to the control unit ? or does the control unit receive and process  those signals directly  ?

[Loren]

Yes, there are sensors (with battery) inside each wheel.

[dphatch]

My question was  about sensors in/around the wheel wells that detected the signal from the sensors in the wheel ? 

Or are the signals received by the control unit alone ?

[Loren]

Sensors/transmitters are inside the wheels.

The receiver is the control unit that then communicates with the PCM/radio and the instrument cluster via CAN (network).

[JFP in PA]

By far the most common reason TPMS systems act up is dead or dying batteries in the sensors inside the wheels.  While we have replaced literally hundreds of the wheel TPMS sensors because of this, we have never had to replace the control units in a Porsche. 

 

If you take the car to a well equipped shop, they can place a hand held diagnostic tool by each wheel and quickly determine if the wheel sensors are out.  Takes about 5 min.

[red_smeg]

Is it possible to add TPMS after the fact.  I'm looking at working on my 911 997 2005 and this is one job i'd like to do.

[JFP in PA]

It could be done both cheaply and easily with an aftermarket system, but if you were trying to go factory, it is going to require considerable effort and expense to get everything located in the car and activated with a PIWIS system.