Checking knock control stop: Audi TT Mk1 (APF, AVU, BAM, BFQ, …)
Step-by-step checking knock control stop for the Audi TT Mk1: 12 steps, 2 torque figures. What to remove, what to tighten and to how many Nm, what to.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi TT Mk1 (8N)
Don't miss
- Connect vehicle diagnostic, testing and information systemVAS 5051 A and select vehicle system "“01 - Engine electronics”". The engine must be idling when doing so.
🔩 Torque settings
Values can differ between engine variants — check the code stamped on your block.
| Torque | Fastener / step |
|---|---|
| 20 Nm (15 lb-ft) | Loosen sensor and tighten |
| 20 Nm (15 lb-ft) | Unfasten knock sensors and tighten |
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.
📐 19 workshop diagrams for APF
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Connect vehicle diagnostic, testing and information systemVAS 5051 A and select vehicle system "“01 - Engine electronics”". The engine must be idling when doing so.
- From list (1), select diagnosis function "“08 - Reading measured value block”".
- Use keypad (2) to enter "“20”" for "“display group 020”" and confirm by touching Q key.
- Check displays in zones (1 ... 4).
- Check knock sensor
- Unfasten knock sensors and tighten to 20 Nm — 20 Nm (15 lb-ft)
- Secure attachments
- Change fuel grade Owner's manual
- Check knock sensor
- Check compression 15
- Secure attachments
- Terminate function "“08 - Reading measured value block”" by touching ← key.
Ask TorqFix about your Audi APF — 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 Audi APF — free → or sign up free to see the drawingsOther AUDI procedures
- Adjusting engine mounting
- Removing and installing lower section of intake manifold
- Removing cylinder head - vehicles with engine codes AEH, AKL
- Removing cylinder head - vehicles with engine code APF
- Measured value blocks for ignition timing retardation
- 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.