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Removing and installing engine control units: VW Phaeton (AJS, AYH, BAN, BAP, …)

Step-by-step removing and installing engine control units for the VW Phaeton: 10 steps. 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.

10 steps 12 engine codes engine codes merged from 5 documented variants

🧭 Before you start

Fits: VW Phaeton (3D)

🔧 Engine codes this applies to

AJSAYHBANBAPBJNBKWBLEBRNBRPBTTBWFCBWA

📋 Procedure

  1. Switch off ignition.
  2. Remove plenum chamber cover.
  3. Remove windscreen wiper motor on right side Electrical system92Windscreen wiper system.
  4. Remove gearbox control unit.
  5. Release connectors from control unit and pull off.
AJS? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Control unit can now be removed.
  2. To install, reconnect connectors to engine control unit and lock in position.
  3. Remove windscreen wiper motor on right side Electrical system92Windscreen wiper system.
  4. Install plenum chamber cover.
  5. Adapt new engine control unit "“Guided functions”"

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

The story behind TorqFix →

Workshop data on this page last updated 20 Sep 2026.