Removing and installing anti-theft engine control unit J623 — VW

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

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• The readiness code must be generated if the fault memory has been erased.

🔧 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.

📐 41 workshop diagrams for AUA

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Switch off ignition.
2. Remove air filter .
3. Open wiring guide (1) and lift locking device (2).
4. Take engine control unit out of retainer.
5. Unscrew shear-head bolt (1) using pliers.

6. Turn engine control unit (2) over and unscrew second shear-head bolt using pliers.
7. Pull retainer (1) and protective housing (2) off engine control unit (3) in (direction of arrow).
8. Release connectors on engine control unit and pull off connector.
9. Fit connectors and lock in position.
10. Push the protective housing over the engine control unit.
11. Install retainer for protective housing using new shear-head bolts.
12. Tighten shear-head bolts evenly until head shears off.
13. Insert engine control unit into control unit retainer on plenum chamber bulkhead until it engages in catches (1).
14. Insert wiring into wiring guide (1) and close guide.
15. Install air filter .
16. If engine control unit J623 is renewed, erase learnt values and adapt engine control unit "“Guided functions”".
17. Read fault memory, repair faults if necessary and then clear fault memory "“Guided fault finding”".
18. The readiness code must be generated if the fault memory has been erased.
19. Carry out a road test.
20. Read control unit fault memory again.

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