Removing and installing anti-theft engine control unit (engine code BMT) — VW

🧭 Before you start

Fits: VW Polo 9N (2001–2009)

🔧 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 connector on engine control unit and pull off connector.
8. Fit connector 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 heads shear off.
12. Insert engine control unit into control unit retainer on 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 fault memory, repair faults as necessary and then clear fault memory "“Guided fault finding”".
16. The readiness code will have to be created once the fault memory has been deleted.
17. Carry out a road test.
18. Read control unit fault memory again.

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