Removing and installing engine control unit without theft protection — VW
Removing and installing engine control unit without theft protection on VW: 13 steps, engines AXX, BGP, BGQ, BKC.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Golf V / Jetta (1K, 2003–2009); platform code AJ5
🔧 Engine codes this applies to
📐 57 workshop diagrams for AXX
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Switch off ignition.
- Remove wiper arms and plenum chamber cover Electrical system92Windscreen wiper system; Removing and installing windscreen wiper system.
- Remove plenum chamber bulkhead General body repairs, exterior50Plenum chamber bulkhead; Assembly overview - plenum chamber bulkhead.
- Release front connector (1) from engine control unit and pull it off.
- Lever up catch (2) slightly.
- Then push engine control unit out of retainer (arrow).
- Then release rear connector on engine control unit and pull it off.
- Fit rear connector to engine control unit and lock it in position.
- Push engine control unit onto bracket.
- Press catch (2) against engine control unit.
- Now fit front connector (1) to engine control unit and lock it in position.
- Install plenum chamber bulkhead General body repairs, exterior50Plenum chamber bulkhead; Assembly overview - plenum chamber bulkhead.
- Install wiper arms and plenum chamber cover Electrical system92Windscreen wiper system; Removing and installing windscreen wiper system.
Ask TorqFix about your VW AXX — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your VW AXX — free → or sign up free to see the drawingsOther VW procedures
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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.