Removing Wheel Electronics

Information 

• For vehicles with Tire 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:

Fig 1: Identifying Wheel Electronics Components

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

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

Fig 2: Identifying Wheel Electronics Unit

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• 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
• Tire 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 -A-  can be seen at the valve in the outer rim well base.

Fig 3: Locating Wheel Electronics Unit

Courtesy of PORSCHE CARS NORTH AMERICA, INC.

1. 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: Loosening TPM Valve

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2. Then unscrew union nut and remove valve.