Removing and installing Lambda probe 2 after catalytic converter G131 - bank 2 (left-side) — AUDI

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

🔧 Engine codes this applies to

📋 Procedure

1. Pull off engine cover panel.
2. Clamp off coolant hose (2) using hose clamps (up to Ø 25 mm)3094 and disconnect coolant hose.
3. Plug connection with a suitable plug if necessary.
4. Unbolt coolant expansion tank (arrow).
5. 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).

6. Unplug electrical connector (4).
7. Remove bracket for 4 electrical connectors at bulkhead (to facilitate removal and installation of Lambda probe).
8. Move Lambda probe wiring clear up to Lambda probe.
9. Remove rear noise insulation.
10. Unscrew Lambda probe using tool 3337/5 and extension 3337/6 from Lambda probe open ring spanner set3337. [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 and the clip at gearbox must always be reattached at the same locations to prevent probe wire from coming into contact with exhaust pipe.Secure all hose connections with the correct type of hose clips (same as original equipment): Parts catalogue]

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