Installing mechatronic unit (gearbox removed): VW Jetta VI / Golf V / Jetta

🧭 Before you start

Fits: VW Jetta VI (16, 2010–2018), VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

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• Never lift mechatronic unit on »sender arm« or lay it on arm. — Before installation, make certain that gearbox input speed sender G182 with oil temperature sender in multi-plate clutch G509 is installed.
• Carefully set mechatronic unit on dowel pin (arrow). Ensure that »sender arm« locates in its (fitting position).

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. ⚠ Never lift mechatronic unit on »sender arm« or lay it on arm. — Before installation, make certain that gearbox input speed sender G182 with oil temperature sender in multi-plate clutch G509 is installed.
2. Renew both (O-rings) at connection for mechatronic unit if you refit an »old« mechatronic unit.
3. Moisten O-rings with dual clutch gearbox oil.
4. Carefully set mechatronic unit on dowel pin (arrow). Ensure that »sender arm« locates in its (fitting position).
5. Sender arm is not allowed to strike sender wheel. (Detail)

6. Do not pinch wiring.
7. Look to see if mechatronic unit has made contact correctly.
8. First start all securing bolts (1 … 10)»by hand«.
9. Then tighten all securing bolts (1 … 10) diagonally to 5 Nm and then turn 90° further in the same sequence. Start with bolt (1). — 5 Nm (3.7 lb-ft)
10. First engage wiring for gearbox input speed sender G182 with oil temperature sender in multi-plate clutch G509 into upper clip (arrow II). Then into lower clip (arrow I).
11. Press connection onto mechatronic unit.
12. Tighten bolts (arrows) of gearbox cover (A) alternately »in diagonal sequence« to 10 Nm. — 10 Nm (7.4 lb-ft)
13. Fill with oil without renewing filter .
14. Connect .
15. Conduct basic adjustment of mechatronic unit for dual clutch gearbox J743.

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