Injection and ignition system (8-cyl. 5-valve injection engine) — Removing and installing Lambda probes — AUDI

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

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• Illustration shows engine removed.

🔧 Engine codes this applies to

📐 1 workshop diagram for BAT

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Pull off engine cover panel.
2. Remove air mass meter with air intake hose between air cleaner and throttle valve module J338.
3. Unplug electrical connector (1).
4. Move Lambda probe wiring clear up to Lambda probe.
5. Unscrew Lambda probe between engine and bulkhead using tool from Lambda probe open ring spanner set3337. [Note: Illustration shows engine removed.] [Note: The thread on the Lambda probe is coated with assembly paste. This paste must not be allowed to penetrate the openings on the probe.In the case of a used Lambda probe only grease the thread with high-temperature paste. This paste must not be allowed to penetrate the openings on the probe; high-temperature paste Parts catalogue.When installing, all cable ties must always be reattached at the same location to prevent them from coming into contact with the exhaust pipe.]

6. Pull off engine cover panel.
7. Clamp off coolant hose (2) using hose clamp (up to Ø 25 mm)3094 and disconnect coolant hose.
8. Seal off connection with a suitable plug if necessary.
9. Unbolt coolant expansion tank (arrow).
10. Unplug electrical wire for coolant shortage indicator switch F66 at expansion tank (bottom) and move expansion tank to one side (coolant hose (1) remains attached).
11. Unplug electrical connector (1).
12. Remove bracket for 4 electrical connectors on bulkhead (to facilitate removal and installation of Lambda probe).
13. Move Lambda probe wiring clear up to Lambda probe.
14. Unscrew Lambda probe between engine and bulkhead using tool from Lambda probe open ring spanner set3337. [Note: Illustration shows engine removed.] [Note: The thread on the Lambda probe is coated with assembly paste. This paste must not be allowed to penetrate the openings on the probe.In the case of a used Lambda probe only grease the thread with high-temperature paste. This paste must not be allowed to penetrate the openings on the probe; high-temperature paste Parts catalogue.When installing, all cable ties must always be reattached at the same location to prevent them from coming into contact with the exhaust pipe.Secure all hose connections with the correct type of hose clips (same as original equipment): Parts catalogue]

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