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Checking fuel pressure during vehicle operation, engine code CDLG — VW

Checking fuel pressure during vehicle operation, engine code CDLG on VW: 15 steps, engines CDLG. What to remove, in what order, and what to check after.

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

15 steps 1 engine code

🧭 Before you start

Fits: VW Golf VI (5K, 2008–2013); platform code 521

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  • Ensure plug-in connectors are secured properly by pulling.
  • Ensure that drain tap (C) on pressure tester(1) is closed.

🔧 Engine codes this applies to

CDLG

📋 Procedure

  1. Observe safety precautions .
  2. Observe rules for cleanliness .
  3. Remove bench seat General body repairs, interior72Rear seat; Removing and installing bench seat / individual seats.
  4. Remove fuel pump control unit J538(2) from cover (1).
  5. Unclip right cover (1) at retaining tabs (arrows), using removal wedge3409.
CDLG? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Pull off supply line (arrow). Separate plug-in connectors .
  2. ⚠ The fuel line is under pressure.Risk of injury to eyes and skin from fuel.Wear eye protection and protective clothing to avoid eye injuries and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully opening the connection point. — Collect escaping fuel with a cleaning cloth.
  3. Connect pressure testerVAS 6550 to fuel supply line using hoseVAS 6550/1.
  4. Connect pressure testerVAS 6550 to fuel delivery unit using hoseVAS 6550/2.
  5. Connect connection leadVAS 5051/66 to pressure testerVAS 6550 and to .
  6. Ensure plug-in connectors are secured properly by pulling.
  7. Ensure that drain tap (C) on pressure tester(1) is closed.
  8. Shut-off valves (A) and (B) on pressure tester(1) are open.
  9. Switch on pressure testerVAS 6550.
  10. Follow instructions on vehicle diagnostic tester.

Other VW 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.