A8 Quattro Sedan V8-4.2L (BVJ) (2008)
Fuel Pressure Sensor/Switch: Service and Repair
Fuel Pressure Sensor
Removing
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Remove the intake manifold. Refer to => [ Upper Intake Manifold ] See: Engine, Cooling and Exhaust/Engine/Intake Manifold/Service and
Repair/Intake Manifold and Injectors, with Plastic Manifold.
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Open the high pressure fuel line union nut at the fuel rail.
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Remove the fuel pressure sensor - 1 - bolt.
‹› The installed location on MY 2009 vehicles may differ.
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Remove the fuel pressure sensor with the high pressure line.
‹› Do not change the angles of the high pressure lines.
Installing
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Tighten the fuel pressure switch.
‹› The high pressure line connectors - arrows - must not be damaged.
‹› Do not bend the high pressure line to a different angle.
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Tighten the high pressure fuel line union nut by hand.
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Make sure the high pressure fuel line is free of tension.
‹› Tightening specifications, refer to => [ Component Location Overview ] See: Powertrain Management/Computers and Control Systems/Locations.
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Tighten the 17 mm union nut on the high pressure line with the (VAG 1331) and the (VAG 1331/6).