A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009)
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While the engine is idling, remove the fuel pump control module fuse.
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Check the fuel pressure displayed.
‹› The fuel pressure decreases rapidly because the mechanical high pressure pump is no longer supplied with fuel from the transfer fuel pump (G6).
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Switch ignition off as soon as the fuel pressure drops to approximately 8 bar.
‹› The fuel pressure must not drop below 6 bar or the engine will shut off (risk of catalytic converter damage).
CAUTION!
The fuel lines will continue to be filled with fuel, but will no longer be under high pressure. To open fuel system, wear protective eyewear
and clothing to prevent injuries and contact with skin.
Before opening the high pressure system, place a cloth around the connection.
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After reducing fuel pressure, place a clean cloth around the connection and open the high pressure system immediately. Escaping fuel must be
absorbed.
Perform the following steps after completing all work:
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Install the fuse.
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Erase the DTC memory and, using Guided Fault Finding, generate the readiness code.
