TorqFix

Emptying the gas line — VW

Emptying the gas line on VW: 18 steps, engines CMAA, CNKA. 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.

18 steps 2 engine codes engine codes merged from 2 documented variants

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

Don't miss

  • Switching (1) to gas mode is briefly displayed in dash panel insertK.
  • Read and observe safety information displayed!
  • Connector remains connected.

🔧 Engine codes this applies to

📋 Procedure

  1. ⚠ Autogas is heavier than air!There must be no cavities in the ground (depressions, pits, channels, cellars or other hollow areas into which the gas can flow).There must be no ignition sources present, e.g. exposed flame, sparks, electrostatic discharge or hot surfaces, that could cause the Autogas to ignite. — Connect vehicle diagnosis, testing and information systemVAS 5051B.
  2. Open clamp (1) and remove cap (2) from Autogas tank.
  3. Start engine. [Note: Switching (1) to gas mode is briefly displayed in dash panel insertK.]
  4. Switch vehicle diagnosis tester on.
  5. Select "“Guided fault finding”" field on screen.
CMAA? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Press > field to confirm.
  2. Select one after another:
  3. Confirm vehicle identification
  4. Select "“01 - Systems capable of self-diagnosis”"(arrow) and confirm with >.
  5. Select "“01 - Engine management system”"(arrow) and confirm with >.
  6. Select "“01 - Functions”"(arrow) and confirm with >.
  7. Select "“Read pressure in gas rail”" function (arrow) and confirm with >. [Note: Read and observe safety information displayed!]
  8. Confirm safety note with > field.
  9. Undo nut (1) from gas tank valve N495(2) and pull valve off (in direction of arrow). [Note: Connector remains connected.]
  10. Confirm > field.
  11. The following functions can be selected with fields 1 to 3:
  12. Stop engine.
  13. ⚠ There is a danger of injury due to escaping gas.The system is pressurised.Wear suitable protection such as eye protection and protective gloves.Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection. — Carefully detach gas line from vaporiser.

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.