Removing and installing knock sensor 4G199 - vehicles up to model year 2013 — AUDI

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

Don't miss

• Disregard (items 2, 3).
• Disregard (items 1, 2).
• Disregard (item 1).
• Mark installation position of subframe on longitudinal members with felt-tip pen.
• The tightening torque influences the function of the knock sensor.

🔧 Engine codes this applies to

📋 Procedure

1. Set front wheels to straight-ahead position.
2. ⚠ Electronic components are susceptible to damage.Observe notes on procedure for disconnecting the battery. — Disconnect earth wire from battery terminal Electrical system27Battery; Disconnecting and connecting battery.
3. Support engine in installation position .
4. Remove bumper cover (front) General body repairs, exterior63Bumper (front); Removing and installing bumper cover.
5. Remove noise insulation panels General body repairs, exterior66Noise insulation; Removing and installing noise insulation.

6. Remove front underbody trim panels (right and left) General body repairs, exterior66Underbody trim; Exploded view - underbody trim.
7. Remove longitudinal member (bottom left and right) General body repairs, exterior50Lock carrier; Exploded view - lock carrier.
8. Completely remove wheel housing liners (front left and front right) General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
9. Unbolt drive shaft (left and right) from gearbox flange shafts Running gear, axles, steering40Drive shaft; Removing and installing drive shaft.
10. Remove bolt (4) for battery positive wire (3) and bolt (2) for earth wire (1) and move electrical wiring clear.
11. Remove bolts (1 and 2).
12. Unplug electrical connector (arrow) at front vehicle level sender G78/G289 and move electrical wiring clear.
13. Remove bolt (1) for anti-roll bar on both sides. [Note: Disregard (items 2, 3).]
14. Remove bolts (3) on both sides. [Note: Disregard (items 1, 2).]
15. Remove bolt (arrow) for power steering hydraulic line.
16. Remove bolts for gearbox mounting (arrows) on both sides.
17. Detach intermediate steering shaft from steering rack and move clear by telescoping splines together Running gear, axles, steering48Steering column; Removing and installing intermediate steering shaft.
18. Unplug electrical connector (2).
19. Remove bolt (1).
20. Remove electrical connector (2) for Servotronic solenoid valve N119 from bracket and unplug connector: [Note: Disregard (item 1).]
21. Unplug electrical connectors (left and right) (1, 2).
22. Remove bolt for engine mountings (arrow) on both sides.
23. Support subframe using engine and gearbox jackV.A.G 1383 A as illustrated.
24. Mark installation position of subframe on longitudinal members with felt-tip pen.
25. Unscrew subframe bolts (1, 2, 3) on both sides in several stages and in diagonal sequence.
26. ⚠ Risk of damage to running gear components.The vehicle must NOT be lowered onto its wheels if the engine/gearbox mountings, steering rack or subframe cross brace are not properly installed. — Lower subframe using engine and gearbox jackV.A.G 1383 A just far enough for access to knock sensor 4G199, ensuring sufficient clearance for hydraulic fluid hoses (left-side) and electrical wiring (right-side).
27. Unplug electrical connector (arrow).
28. Remove bolt (2).
29. Detach knock sensor 4G199 and unplug electrical connector (1). [Note: The tightening torque influences the function of the knock sensor.]
30. Install engine mounting (left-side) .

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