Special Notes For Tire Pressure Monitoring (TPM)

→ Read and follow the installation instructions for the wheel electronics units. → 443219 REMOVING AND INSTALLING WHEEL ELECTRONICS 

→ Check that the wheel electronics units are assigned correctly.

Information 

• If the old wheels are still in the vicinity after assembly work (for example changing winter tires and/or wheels from another vehicle with TPM), these will still be detected by the system. If one or more of these wheels has a minimum pressure of more than 0.5 bar (7 psi) below the required pressure, this can trigger a warning in the instrument cluster. In this case, remove the other wheels or use the PIWIS Tester to tune the vehicle to be outside the radio range of these wheels. 
• Before changing a tire, read out the remaining life span of the wheel electronics unit (battery capacity) using the PIWIS Tester. 
• For vehicles with a TPM, the valve and wheel electronics unit -A- are only replaced in exceptional cases. The following points can make replacement necessary. 

Fig 1: Locating Wheel Electronics Unit

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Fig 2: Overview Of TPM Valve/Wheel Electronics

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. -A-  - Wheel electronics
2. -B-  - Valve complete (No. 2 to No. 7)
3. -1-  - Self-locking (Torx) fastening screw
4. -2-  - Valve cap (plastic)
5. -3-  - Valve insert
6. -4-  - Union nut
7. -5-  - Washer chamfered on both sides
8. -6-  - Bead seat sealing ring
9. -7-  - Valve

The valve -B- must be replaced if: 

• The wheel electronics unit -A-  is removed
• The self-locking fastening screw -1-  is loose
• The union nut -4-  is loose
• The valve -7-  is leaking at the valve seat
• The valve -7-  (valve body) is bent or broken.

The wheel electronics unit -A- must be replaced if: 

• The housing is visibly deformed
• The filter surface (on the bottom) is so soiled that it cannot be cleaned by wiping
• Tyre sealant (tire sealing liquid) has been used