Removing and installing anti-theft engine control unit, engine codes BMS, BWB — VW

🧭 Before you start

Fits: VW Polo 9N (2001–2009)

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• The readiness code must be generated if the event memory has been cleared.

🔧 Engine codes this applies to

📋 Procedure

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

6. Pull retainer (1) and protective housing (2) off engine control unit (3) in (direction of arrow).
7. Release connectors on engine control unit and pull off connector.
8. Fit connectors and lock in position.
9. Push the protective housing over the engine control unit.
10. Install retainer for protective housing using new shear-head bolts.
11. Tighten shear-head bolts evenly until head shears off.
12. Insert engine control unit into control unit retainer on plenum chamber bulkhead until it engages in catches (1).
13. Insert wiring into wiring guide (1) and close guide.
14. If engine control unit is renewed, clear learnt values and adapt engine control unit "„Guided functions“".
15. Read event memory, rectify any faults and then clear event memory: "„Guided Fault Finding“".
16. The readiness code must be generated if the event memory has been cleared.
17. Carry out a road test.
18. Read control unit event memory again.

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