911 Turbo Cabriolet AWD (997) F6-36L Turbo (2008) - Tire Pressure Sensor Service
Tire Pressure Sensor: Service and Repair
Removing and installing wheel electronics
General information on wheel electronics
The Tire Pressure Monitoring system is designed to constantly monitor the tire pressure during driving and when the vehicle is stationary. One set of
electronics -A- per tire is mounted in the rim well base. These measure tire pressure and temperature at regular intervals and transfer the values to a
central control unit via a high-frequency route. The control unit evaluates the information and transfers the data to the combination instrument if
required. In this way, the driver is warned and informed if the tire pressure has to be corrected.
Wheel electronics
There are various types of wheel electronics -A- available.
The fundamental difference is in the TPM generation (1st generation up to 2008 model or 2nd generation from 2009 model onwards) and also in the
frequency (433 MHz or 315 MHz).
1st generation TPM wheel electronics up to 2008 model are not compatible with 2nd generation TPM wheel electronics as of 2009 model.
If wheels with 1st generation TPM wheel electronics are fitted on a vehicle with 2nd generation TPM wheel electronics (or vice versa), the TPM
system will not recognize the wheel electronics. The TPM system is not active and a corresponding warning message appears in the instrument cluster.
In addition, the wheel electronics are reported as defective in the fault memory of the TPM control unit.
The following points can be used as distinguishing characteristics of wheel electronics:
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Labelling - 433 MHz or 315 MHz
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Color
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Without 8 stars (the illustration shows 8 stars, 4 each to the left and right of the slot, wheel electronics with amplified transmission power from the
Cayenne)
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Special wheel electronics - 315 MHz: Indicated by 14 slashes
Wheel electronics components
-A- - Wheel electronics