Removing and installing mobile telephone operating electronics control unit J412 (as of MY 04) — AUDI
Removing and installing mobile telephone operating electronics control unit J412 (as of MY 04) on Audi: 11 steps, 2 torque figures.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A2 (8Z)
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 7 Nm (5.2 lb-ft) | Screw out bolt (2 |
| 7 Nm (5.2 lb-ft) | Screw out both bolts (1 |
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
- Switch off all electrical equipment.
- Remove ignition key.
- Remove floor covering on front passenger's side General body repairs, interior70.
- Detach cover over intermediate panel.
- Unplug connector at control unit.
- Screw out both bolts (1) (7 Nm) and take out holder together with control unit (2). — 7 Nm (5.2 lb-ft)
- Detach Bluetooth aerial (5).
- Screw out bolt (2) (7 Nm) and detach plastic clip (1) from holder (4). — 7 Nm (5.2 lb-ft)
- Pull control unit (3) out of holder (4).
- Install accordingly in reverse order of removal.
- Control unit encoding and adaption Radio, telephone and navigation system, self-diagnosis01.
Other AUDI procedures
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
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.