Cayenne S (9PA) V8-4.5L (2003)
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Valve must be completely replaced with screw -1 to 7- if:
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The wheel electronics are removed
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The self-locking -1- fastening screw is loose
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The bead seat sealing ring -6- is porous or damaged
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The valve body -7- is distorted
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The union nut-4- is loose
The wheel electronics -A- must be replaced if:
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The housing is visibly deformed
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The filter surface (square, porous section on back of wheel electronics) is so badly soiled that it can no longer be cleaned by wiping
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Tyre sealant (tyre sealing liquid) has been used
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The service life of the battery has expired
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There is a fault within the wheel electronics.
When the tyre is removed, the wheel electronics -A- become visible in the outer rim well base, at the valve.
1. Release wheel electronics from valve with an inner Torx screwdriver T 20 (if necessary, counter with a suitable assembly pin, e.g. steel pin
[diameter] approximately 1.8 mm, in bore at valve foot) and remove.
2. Then unscrew union nut and remove valve.
Installation
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When replacing the wheel electronics, always use a completely new valve and a new fastening screw!
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The tightening torque wheel for the electronics/valve is 4 Nm (3 ft. lbs.) (± 0.5 Nm (0.5 ft. lbs.))!
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The wheel electronics must not come into contact with the tyre fitting paste or solvent!
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Each time a gear set or wheel is changed this must be communicated to the control module, in particular if the positions of the wheels have been
changed. The tyre type and tyre size must always be selected in the instrument cluster under Main menu > Tyre pressure > Settings. During the
journey the control module then re-learns the wheel positions.
1. Install wheel electronics loosely at the valve (do not tighten) and position in the valve bore together with the valve and bead seat sealing ring.
Caution! Remove assembly pin after installing valve! Otherwise the lyre will be damaged during fitting.
Tighten the valve only once to the stipulated torque in the rim.
2. Position the washer that has been chamfered on both sides and screw on the union nut as far as the mounting face. Visibly twist bore at valve foot.