TorqFix

C6 - DT20C — CITROEN

C6 - DT20C on Citroen: 74 steps, engines DT20C(X8Z). What to remove, in what order, and what to check after.

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

74 steps 1 engine code

🧭 Before you start

Fits: platform codes 3.0, V6, HDI, FAP, 240

Don't miss

  • Caution! The temperature of the engine and exhaust will increase significantly

🔧 Engine codes this applies to

DT20C(X8Z)

📋 Procedure

Preparation and removal

  1. Caution! The temperature of the engine and exhaust will increase significantly
  2. Check the tightness of the turbocharger hoses
  3. Note: The fuel tank should contain at least 20 litres of fuel
  4. Remove the underbody cover
  5. Start the engine
DT20C(X8Z)? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Run the engine until warm
  2. Connect the diagnostic tool
  3. Note: Plug the ends of the fuel lines
  4. Remove the bolt
  5. Disconnect the mounting clips
  6. Support the fuel tank
  7. Lower the fuel tank
  8. Detach the breather pipe
  9. Note: Mark the position
  10. Remove the additive tank
  11. Stage 2:
  12. Engine running at idle speed
  13. Stage 3:
  14. Run the engine at idle speed
  15. Wait until the engine has cooled down
  16. Stop the engine
  17. Empty the additive tank
  18. Collect the escaping fluid in a measuring container
  19. Check the additive level

Installation and checks

  1. Remove the underbody cover
  2. Refit the additive tank
  3. Installation is in the reverse order of removal
  4. Refill the additive tank
  5. Raise the filling container above the additive tank
  6. Open the filling container valve
  7. Reprogram the additive pump
  8. Use the diagnostic tool
  9. Close the valve when fluid is escaping through the overflow pipe
  10. Disconnect the additive tank filling kit filler pipe from the additive tank filler pipe
  11. Disconnect the overflow pipe
  12. Remove the filling and overflow container
  13. Reconnect the filler pipe
  14. Refit the cover
  15. Reset the additive system
  16. Use the diagnostic tool

Other CITROEN 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.