S5 Quattro Coupe V8-4.2L (CAUA) (2009)
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Install union nut - 1 - on tire pressure sensor - 2 -.
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Press tire pressure sensor - 1 - onto rim well and tighten union nut => [ Tire Pressure Sensor Assembly Overview ] See: Tire Pressure Sensor
Assembly Overview.
‹› After installing, tire pressure sensor must lie firmly in its bed.
‹› Sealing washer - arrow - becomes slightly deformed when doing this.