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Checking fuel low-pressure at high-pressure pump — AUDI

Checking fuel low-pressure at high-pressure pump on Audi: 13 steps, engines CDBA, CDCA, CNEA, CNFA. What to remove, in what order, and what to check after.

Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.

13 steps 6 engine codes

🧭 Before you start

Fits: platform codes S1, 2H

  • Special tools named: VAS 6551/2, VAS 6551/5

🔧 Engine codes this applies to

CDBACDCACNEACNFACNFBCSHA

📐 25 workshop diagrams for CDBA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

Checking fuel low-pressure at high-pressure pump — CDBA · diagram 1
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 2
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 3
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 4
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 5
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 6
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 7
Checking fuel low-pressure at high-pressure pump — CDBA · diagram 8
+ 17 more diagrams
🔒 25 workshop diagrams for this job Ask about your Audi CDBA — free or sign up free to see the drawings

📋 Procedure

  1. ⚠ Read rules for cleanliness and the instructions when performing any work on the fuel system.Always follow these rules for cleanliness and instructions before starting work and while working on the fuel system.Wrap a clean cloth around the connection before opening the fuel system, then carefully loosen the connection to release the pressure. — Loosen spring-type clip(2) of fuel supply line (1).
  2. Pull fuel supply line (1) off high-pressure pump.
  3. Collect escaping fuel with a cleaning cloth.
  4. Connect pressure testerVAS 6551(1) with hoses from adapter setVAS 6551/5.
  5. Connect hose VAS 6551/2 as well as connection fitting VAS 6551/5-1 from adapter setVAS 6551/5 to fuel supply line (3) and connection (A) of pressure testerVAS 6551.
CDBA? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Open shut-off tap (A).
  2. Connect hose »-2« from adapter setVAS 6551/5 to open connection on high-pressure pump (2) and connection (B) of pressure testerVAS 6551.
  3. Close shut-off taps (B) and (C).
  4. Switch on pressure testerVAS 6551 by pressing on/off pushbutton.
  5. Carefully open shut-off tap (B).
  6. Connect to test instrument boxVAS 6356.
  7. Activate fuel pump using guided function "“Fuel pump activation”".
  8. The fuel pump is activated.
Workshop diagrams

Ask TorqFix about your Audi CDBA — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.

Ask about your Audi CDBA — free → or sign up free to see the drawings

Other AUDI procedures

Who makes these pages, and how

TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.

The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.

Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.

Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com

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Workshop data on this page last updated 20 Sep 2026.