Removing and installing secondary air inlet valve N112/N320 — AUDI

🔧 Engine codes this applies to

📋 Procedure

1. Drain coolant .
2. Remove lock carrier cover General body repairs, exterior63Bumper (front); Removing and installing attachments.
3. Remove closure plate for bumper cover (front) General body repairs, exterior63Bumper (front); Removing and installing attachments.
4. Remove bumper cover (front) General body repairs, exterior63Bumper (front); Removing and installing bumper cover.
5. ⚠ 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.

6. Support engine in installation position .
7. Remove noise insulation panels General body repairs, exterior66Noise insulation; Removing and installing noise insulation.
8. Remove underbody trim (front left and right) General body repairs, exterior66Underbody trim; Removing and installing underbody trim.
9. Completely remove wheel housing liners (front left and front right) General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
10. Unbolt drive shaft (left and right) from gearbox flange shafts Running gear, axles, steering40Drive shaft; Removing and installing drive shaft.
11. Remove bolt (arrow) at bracket.
12. Release clamp (2) and detach exhaust pipe (1) for auxiliary heater.
13. Remove front longitudinal member (bottom) on both sides General body repairs, exterior50Lock carrier; Exploded view - lock carrier.
14. Remove bolt (4) for battery positive wire (3) and bolt (2) for earth wire (1) and move electrical wiring clear.
15. Remove bolt (arrow) for power steering hydraulic line.
16. Remove bolts (1 and 2).
17. Unplug electrical connector (2).
18. Remove bolt (1).
19. Unscrew bolt (1) and move earth wire clear at longitudinal member.
20. Remove nut (3) and unplug electrical connector (2).
21. Release hose clip (arrow) and detach coolant hose.
22. Unplug electrical connector (arrow) at front vehicle level sender G78/G289 and move electrical wiring clear.
23. Remove bolt (1) for anti-roll bar on both sides. [Note: Disregard (items 2 and 3).]
24. Remove bolts (3) on both sides. [Note: Disregard (items 1, 2).]
25. Remove bolts for gearbox mounting (arrows) on both sides.
26. Detach intermediate steering shaft from steering rack and move clear by telescoping upwards Running gear, axles, steering48Steering column; Removing and installing intermediate steering shaft.
27. Detach electrical connector (2) from bracket and unplug: [Note: Disregard (item 1).]
28. Move electrical connectors and wiring clear:
29. Unplug electrical connectors (left and right) (1, 2).
30. Remove bolt for engine mountings (arrow) on both sides.
31. Support subframe using engine and gearbox jackV.A.G 1383 A as illustrated.
32. Mark installation position of subframe on longitudinal members with felt-tip pen.
33. Unscrew subframe bolts (1, 2, 3) on both sides in several stages and in diagonal sequence.
34. ⚠ 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. — Using engine and gearbox jackV.A.G 1383 A, lower subframe just far enough for access to secondary air inlet valves N112/N320, ensuring sufficient clearance for hydraulic fluid hoses (left-side) and electrical wiring (right-side).
35. Remove bolt (1), unclip guide tube (2) for oil dipstick from intake manifold and detach.
36. Unplug electrical connector (3).
37. Mark positions of vacuum hoses (1) for re-installation.
38. Release catches (arrows) and detach secondary air inlet valve N112(item 2) from bracket and to left side.
39. Disconnect vacuum hoses.
40. Unplug electrical connector (1).
41. Mark positions of vacuum hoses (3) for re-installation.
42. Release catches (arrows) and detach secondary air inlet valve 2N320(item 2) from bracket and to left side.
43. Disconnect vacuum hoses. [Note: Secure all hose connections with the correct type of hose clips (same as original equipment) Electronic parts catalogue.Do not reuse coolant.]
44. Install gearbox mountings .
45. Install intermediate steering shaft Running gear, axles, steering48Steering column; Removing and installing intermediate steering shaft.
46. Install front longitudinal member (bottom) General body repairs, exterior50Lock carrier; Exploded view - lock carrier.
47. Secure drive shafts Running gear, axles, steering40Drive shaft; Exploded view - drive shaft.
48. Install front wheel housing liners General body repairs, exterior66Wheel housing liners; Exploded view - front wheel housing liner.
49. Install underbody trim (front) General body repairs, exterior66Underbody trim; Exploded view - underbody trim.
50. Install noise insulation panels General body repairs, exterior66Noise insulation; Exploded view - noise insulation.
51. Observe notes on procedure for connecting the battery Electrical system27Battery; Disconnecting and connecting battery.
52. Install lock carrier cover, bumper cover and closure plate for bumper cover (front) General body repairs, exterior63Bumper (front); Exploded view - bumper cover.
53. Fill up with coolant .

Other AUDI procedures

• Removing and installing ignition coils with output stages, cylinder bank 2 (left-side)
• Removing and installing coolant pipe (bottom rear)
• Removing high-pressure pipe, cylinder bank 1 (right-side)
• Removing and installing coolant valve for gearbox N488
• Removing high-pressure pipe (cylinder bank 1, right-side)
• Removing and installing toothed belt · 56 torque figures
• Removing engine · 41 torque figures
• Removing camshaft timing chain from camshafts · 38 torque figures
• Installing engine · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures