Removing and installing engine control unit J623, Polo — VW

🧭 Before you start

Fits: VW Polo 6R (2009–2014)

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

🔧 Engine codes this applies to

📐 66 workshop diagrams for CAYA

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

📋 Procedure

1. Switch off ignition.
2. Switch off ignition.
3. Release connectors on engine control unit and pull off connector.
4. Press clips (arrows A) outwards and pull engine control unit out to side (B).
5. Insert new engine control unit and press to the left.

6. Fit connectors and lock in position.
7. Read event memory, rectify any faults and then clear fault memory: "“Guided Fault Finding”".
8. The readiness code must be generated if the event memory has been cleared.
9. Carry out a road test.
10. Read control unit event memory again.

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