Removing and installing Lambda probe before catalytic converter - bank 1 (right) — AUDI

🧭 Before you start

Fits: Audi A8 D3 (4E, 2002–2010)

• Special tools named: 3337

Don't miss

• Disregard (items 1, 3, 4).
• Shown in illustration with engine removed.

🔧 Engine codes this applies to

📋 Procedure

1. Pull off engine cover panel (rear) (arrows).
2. If fitted, remove cover for suspension turret (right-side); to do so, detach spreader clips (1) and unscrew nut (2).
3. Pull cover out of retainers (arrows).
4. Pull non-return valve (2) off connection at air intake hose.
5. Unclip vacuum line (1) and fuel line (3) from retainer on air intake hose.

6. Release hose clips (arrows) and remove air intake hose.
7. Unplug electrical connector (1).
8. Detach vacuum hose (2).
9. Remove bolts (arrows).
10. Take out air cleaner housing.
11. Unplug electrical connector (2) for Lambda probe G39. [Note: Disregard (items 1, 3, 4).]
12. Unscrew Lambda probe (2) using Lambda probe open ring spanner set 3337/7. [Note: Shown in illustration with engine removed.] [Note: Threads of new Lambda probes are already coated with assembly paste; the paste must not get into the slots on the probe body. If reinstalling the old Lambda probes, coat the threads with high-temperature paste Electronic parts catalogue. The paste must not get into the slots on the Lambda probe body. Fit all cable ties in the original positions when installing. When installing, the Lambda probe wire must always be reattached at the same locations to prevent it from coming into contact with the exhaust pipe.]

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