S8 Quattro Sedan V10-5.2L (BSM) (2009)
The fuel level sensor 2 (G169) and fuel level sensor 4 (G393) are accessible at right front in luggage compartment.
Procedure
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Remove luggage compartment floor lining.
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Remove cover for right sealing flange - arrows -.
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Carefully release and unplug connectors - 1 - and - 2 - at left sealing flange.
4-pin Connector Assignment on Fuel Level Sensor 2