Removing Wheel Electronics

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2018 Porsche Cayenne, 2017 Porsche Cayenne, 2016 Porsche Cayenne, 2015 Porsche Cayenne, and 2014 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Information

For vehicles with Tyre Pressure Monitoring, the valve and wheel electronics are only replaced in exceptional cases! The following points can make replacement necessary!

Valve complete with screw -1 to 7- must be replaced if:

The wheel electronics unit is removed
The self-locking -1- fastening screw is loose
The bead seat sealing ring -6- is porous or damaged
The valve body -7- is bent
The union nut -4- is loose.

Fig 1: Identifying Self Locking Nut

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

The wheel electronics -A- must be replaced if:

Fig 2: Identifying Wheel Electronics Unit

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

The housing is visibly deformed
The filter surface (round, porous section on back of wheel electronics) is so badly soiled that it can no longer be cleaned by wiping
Tyre sealant (tire sealing liquid) has been used
The service life of the battery has expired
There is a fault within the wheel electronics unit.

After removal of the tire, the wheel electronics unit -A- can be seen at the valve in the outer rim bed.

Fig 3: Locating Wheel Electronics Unit Fitted

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Release the wheel electronics unit from the valve using a Torx socket screwdriver T 20 (counter with a suitable assembly pin if necessary, e.g. steel pin with diameter of approx. 1.8 mm in bore at valve foot) and remove it. The new valve comes with an assembly pin. This can also be used for removing the wheel electronics unit.

Fig 4: Countering TPM Valve While Loosening
Courtesy of PORSCHE CARS NORTH AMERICA, INC.
Then unscrew union nut and remove the valve.