Removing and installing temperature sensor G18 and overheating sensor G189 — AUDI

🧭 Before you start

Fits: Audi A3 (8V, 2012–2020); platform code 85

• Renewed: seals

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• Sensors cannot be renewed separately.

🔩 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. Remove auxiliary heater .
2. Remove covers .
3. Remove bolt (1) (4 Nm) and detach retaining spring (2). — 4 Nm (3.0 lb-ft)
4. Pull out temperature sensor G18(3) and overheating sensor G189(4) using long-nose pliers.
5. Renew seals.
6. Check sealing surfaces and clean if necessary.
7. Before inserting sensors, coat seals with coolant.
8. When assembling, make sure that retaining spring (2) is positioned correctly. [Note: Sensors cannot be renewed separately.]

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