Removing and installing anti-theft engine control unit J623 — AUDI
Removing and installing anti-theft engine control unit J623 on Audi: 17 steps, engines BGU, BSE, BSF, CAYD.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: platform code 2C0
📋 Procedure
- Switch off ignition.
- Remove wiper arms Electrical system92Windscreen wiper system; Removing and installing wiper arms.
- Remove plenum chamber bulkhead General body repairs50Body - front; Plenum chamber bulkhead.
- Push down retaining frame in direction of (arrow) and remove engine control unit.
- Unscrew shear-head bolts (arrows) using a pair of pliers.
- Insert screwdriver between both locking plates (arrow).
- Carefully press screwdriver in (direction of arrow) and bend retaining bar (1) upwards at the same time.
- Bend retaining bar (1) in (direction of arrow) until it can be pulled off connector.
- Push locking devices of connectors in (direction of arrow) and pull off connectors.
- Fit connectors to engine control unit and push locking devices to stop in (direction of arrow).
- Fit retaining bar (1) onto connectors and press it in direction of (arrow).
- Guide pin (2) to stop into hole on valve timing housing.
- Use new shear-head bolts to secure retaining bar to engine control unit (arrows).
- Tighten shear-head bolts (arrows) uniformly until bolt heads shear off.
- Place engine control unit into retaining frame and push upwards in (direction of arrow).
- Install plenum chamber bulkhead General body repairs50Body - front; Plenum chamber bulkhead.
- Install wiper arms Electrical system92Windscreen wiper system; Removing and installing wiper arms.
Other AUDI procedures
- Installing toothed belt – VW Passat B6 · 17 torque figures
- Removing and installing sealing flange (gearbox end) – Audi A3 · 13 torque figures
- Removing and installing injectors – VW · 11 torque figures
- Aligning exhaust system free of stress · 13 torque figures
- Installing engine · 9 torque figures
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
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.