Removing and installing fuel pressure regulating valve N276/N484 — AUDI

🧭 Before you start

Fits: Audi Q7 (4L, 2005–2015)

Don't miss

• Always read rules for cleanliness when working on fuel system .Follow these instructions before starting work and while working on the fuel system. — Remove engine cover panel .
• Clean carefully; cleaning solution must not enter the electrical connector.
• Slacken union nut (counterhold at hexagon flats on housing). Then remove by hand.
• Extract dirt from opening in rail (threads and sealing surface). Do not use metal tools, etc.
• Tighten to 60 Nm (counterhold at hexagon flats on housing).

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. ⚠ Always read rules for cleanliness when working on fuel system .Follow these instructions before starting work and while working on the fuel system. — Remove engine cover panel .
2. Before removal, clean area around thread for fuel pressure regulating valve using commercial cleaning solution etc. (no dirt must enter the opening in the rail element). [Note: Clean carefully; cleaning solution must not enter the electrical connector.]
3. Unscrew banjo bolt for fuel return lines.
4. Dry off fuel pressure regulating valve.
5. Unplug electrical connector (arrow) at fuel pressure regulating valve.

6. Slacken union nut (counterhold at hexagon flats on housing). Then remove by hand.
7. Extract dirt from opening in rail (threads and sealing surface). Do not use metal tools, etc.
8. Seal off opening in rail element immediately with a clean plug from engine bung setVAS 6122 to prevent dirt from entering. [Note: The fuel pressure regulating valve has a deformable sealing lip instead of a separate seal; it can therefore be used only once.Check that sealing surfaces (deformable sealing lip) and thread on new fuel pressure regulating valve are not damaged.Check sealing surface at opening in rail.Apply Molykote grease to thread on fuel pressure regulating valve Electronic parts catalogue.]
9. Screw on union nut by hand.
10. Align regulating valve so that connecting wire is free of tension after connector is attached.
11. Tighten union nut on regulating valve in 3 stages as follows:
12. Tighten to 60 Nm (counterhold at hexagon flats on housing). — 60 Nm (44 lb-ft)
13. Then loosen union nut 90° (1/4 turn; counterhold at hexagon flats on housing).
14. Tighten to 80 Nm (counterhold at hexagon flats on housing). — 80 Nm (59 lb-ft)
15. Tighten banjo bolt with new seals.
16. Check for leaks in fuel system .
17. After installation, run engine at moderate speed for several minutes and then switch off. [Note: The fuel system is self-bleeding; do NOT open the high-pressure connections.]
18. Carefully check the entire fuel system for leaks.
19. If leaks are found although the connections have been tightened to the correct torque, the relevant component must be renewed.
20. After completing the repair, road-test the vehicle. Accelerate with full throttle at least once. Then check the high-pressure section of the fuel system again for leaks. [Note: If there is any air left in the fuel system, the engine may switch to the backup mode ('emergency running' mode) during the road test. Switch off the engine and erase the content of the event memory. Then continue the road test.]
21. After road test interrogate event memory once again.

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