Removing and installing anti-theft engine control unit, Golf Plus — VW

🧭 Before you start

Fits: platform code 521

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. Switch off ignition.
2. Remove plenum chamber bulkhead General body repairs, exterior50Plenum chamber bulkhead; Assembly overview – plenum chamber bulkhead.
3. ⚠ Cover lines, connections and control units in the vicinity of the engine control unit to prevent damage through heat. — Turn temperature setting potentiometer (2) to maximum heat output (600°C).
4. Set two-stage switch for volume of air (3) to position 3.
5. Place nozzle of hot air blower close to shear-head bolt.

6. Switch on hot air blower and heat the bolts.
7. ⚠ When shear-head bolts are heated up, parts of the protective housing will be subjected to a large amount of heat. Wear protective gloves to avoid possible injury. — Twist shear-head bolts (arrows) out using grip pliers and remove cover from protective housing.
8. Then remove securing nuts for control unit bracket (arrows).
9. Release connectors on engine control unit and pull off connector.
10. Press catches (1) and (2) outwards. Then pull engine control unit off control unit bracket in direction of arrow.
11. Push engine control unit onto control unit bracket until it engages in catches.
12. Fit connectors to engine control unit and lock in position.
13. Tighten securing bolts (arrows) to 10 Nm. — 10 Nm (7.4 lb-ft)
14. Install cover of protective housing.
15. Tighten new shear-head bolts (arrows) evenly until heads shear off.
16. Install plenum chamber bulkhead General body repairs, exterior50Plenum chamber bulkhead; Assembly overview – plenum chamber bulkhead.

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