Removing and installing engine control unit with protective housing — VW
Removing and installing engine control unit with protective housing on VW: 19 steps, engines BZB, CAWA, CAWB, CAXA.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Passat B6 (3C, 2005–2010), VW Passat CC (357, 2008–2012)
- Renewed: engine control unit
🔧 Engine codes this applies to
📐 74 workshop diagrams for BZB
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- If you wish to renew the engine control unit, connect the vehicle diagnostic tester and perform the guided function "“Renewing engine control unit”".
- Switch off ignition.
- Remove wiper arms Electrical system92Windscreen wiper system; Removing and installing wiper arms.
- Remove plenum chamber cover General body repairs, exterior64Flush-bonded windows; Assembly overview - plenum chamber cover.
- Remove bolts (1).
- Remove engine control unit cover, if fitted.
- Cover the plenum chamber with a clean cloth so that it is not scratched.
- Raise engine control unit with retaining frame slightly.
- Release engine control unit (arrows) and pull out slightly.
- Bend the upper ends (1) of locking clip outwards.
- Remove shear-head bolts (2) using grip pliers and remove locking clip.
- Slide connector locking devices (1) on engine control unit outwards and pull off both connectors.
- Remove engine control unit.
- Slide engine control unit (1) in direction of (arrow) in retaining frame until it engages.
- Tighten the retaining frame.
- Fit connectors to engine control unit and slide locking devices (1) inwards.
- Take a new locking clip and tighten new shear-head bolts evenly until heads shear off.
- Install plenum chamber cover General body repairs, exterior64Flush-bonded windows; Assembly overview - plenum chamber cover.
- Install wiper arms Electrical system92Windscreen wiper system; Removing and installing wiper arms.
Ask TorqFix about your VW BZB — 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 BZB — 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.