RS 4 Quattro Cabriolet V8-4.2L (BNS) (2008)
Fuel Pressure Release: Service and Repair
Before Opening High Pressure Fuel Injection System
Special tools, testers and auxiliary items required
‹› Vehicle Diagnosis, Testing & Info. System (VAS 5051B)
‹› Trim Removal Wedge (3409)
CAUTION!
The fuel injection system is separated into a high-pressure section where the pressure is a maximum of approximately 120 bar and a
low-pressure section where the pressure is approximately 6 bar.
Before opening any components under high pressure, the fuel pressure in the high pressure area must be reduced. The procedure for this
is as follows.
High fuel pressure, reducing:
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Connect Vehicle Diagnosis, Testing & Info. System (VAS 5051B).
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Start engine and run at idle speed.
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Select "engine electronics" in OBD.
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Then select "Measured values".
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Select "display group 140".
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When the engine is at idle, fuel pressure between 30 and 40 bar is displayed.
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Pry off the cover - 1 - on the left of the instrument panel, for example using the (3409) - arrow -.