Removing and installing Lambda probe G39 with Lambda probe heater Z19 — AUDI

🧭 Before you start

Fits: Audi A4 B6/B7 (8E), Audi A4 Cabriolet B6/B7 (8H)

• Special tools named: 3337

Don't miss

• Disregard (item 2).

🔧 Engine codes this applies to

📋 Procedure

1. Unclip cover caps.
2. Unscrew nuts (arrows) and detach engine cover panel. Also pull out dipstick if necessary.
3. Remove insulation beneath cover panel (if fitted).
4. Remove bolts (arrows).
5. Remove air ducts (1) and (2).

6. Unplug electrical connector (1) at air mass meter G70.
7. Loosen hose clip (2) to remove air intake hose.
8. Move clear wiring harness at air cleaner housing and remove air cleaner housing (arrow).
9. Unbolt coolant expansion tank (arrow).
10. Unplug electrical connector for coolant shortage indicator switch F66 at coolant expansion tank (bottom) and move coolant expansion tank to one side (with coolant hoses (1) and (2) attached).
11. Unplug electrical connector (1).
12. Move aside fuel hoses at air pipe.
13. Remove bolt (2).
14. Remove air pipe (arrows).
15. Detach electrical connector (4) from bracket on left side of plenum chamber partition panel.
16. Unplug electrical connector (4) for Lambda probe G39.
17. Move wiring clear.
18. Unscrew Lambda probe (1) using special tool 3337. [Note: Disregard (item 2).] [Note: The screw threads on the new Lambda probes are coated with a special assembly paste.If re-installing old Lambda probe, coat thread with high-temperature paste: Refer to Parts catalogue for high-temperature paste.The assembly paste/high-temperature paste must not get into the slots in the Lambda probe body.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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