Removing and installing horn for anti-theft alarm: Audi A4 B5
Step-by-step removing and installing horn for anti-theft alarm for the Audi A4 B5: 11 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A4 B5 (8D)
📋 Procedure
- Remove luggage compartment side trim (left-side) 70.
- Unscrew bolts (arrows).
- Remove retaining frame (2).
- Take out amplifier with bass loudspeaker (on left in luggage compartment) 91.
- Remove insulation (1).
- Remove bolt (1).
- Take out horn (2) for anti-theft alarm from behind body opening.
- Unplug electrical connector.
- Unscrew nut in order to remove bracket for horn for anti-theft alarm.
- Install amplifier with bass loudspeaker 91.
- Install luggage compartment side trim (left-side) 70.
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
- Checking electrical components of auxiliary heater
- Checking closing of electrohydraulic convertible top - 8-valve pump
- Removing engine - vehicles with engine codes AZV, BKD
- Removing and installing air flow flap control motor V71 with potentiometer for air flow flap control motor G113
- Removing and installing locking cable – Audi TT Mk1
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.