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How to change lambda sensor on AUDI A6 Allroad (4FH, C6) – replacement guide
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Recommended replacement interval for the part category Lambda sensor : 100000 km
Important!
This replacement procedure can be used for:
AUDI A6 Allroad (4FH, C6) 4.2 FSI quattro … View more
The steps may slightly vary depending on the car design.
AUDI A6 Allroad (4FH, C6) 4.2 FSI quattro … View more
The steps may slightly vary depending on the car design.
This video shows the replacement procedure of a similar car part on another vehicle
All the parts you need to replace – Lambda Sensor for A6 Allroad (4FH, C6) and other AUDI models
Alternative products

Electronic spray
High-temperature ceramic grease
Torque wrench
Drive socket # 10
22-mm oxygen sensor socket
Ratchet wrench
Thread tap
Fender cover
Replacement: lambda sensor – AUDI A6 Allroad (4FH, C6). AUTODOC experts recommend:
- After replacing the oxygen sensor, clear the trouble code from the electronic control unit and let the ECU adapt itself to the new sensor.
- Before getting down to work, start the engine and let it warm up to operating temperature.
- Please note: all work on the car – AUDI A6 Allroad (4FH, C6) – should be done with the engine switched off.
Carry out replacement in the following order:
- Step 1Open the bonnet.Step 2Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.Step 3Lift the car using a jack or place it over an inspection pit.Step 4
Unscrew the fasteners of the oxygen sensor housing cover. Use a drive socket #10. Use a ratchet wrench. - Step 5
Remove the oxygen sensor housing cover. - Step 6
Detach the oxygen sensor connector. - Step 7
Unscrew the oxygen sensor fastener. Use a 22-mm oxygen sensor socket. Use a ratchet wrench. - Step 8
Remove the oxygen sensor. - Step 9
Cut the thread for the new oxygen sensor. Use a thread tap. Use a ratchet wrench. - Step 10Treat the oxygen sensor. Use high-temperature ceramic grease.Step 11
Install the new oxygen sensor. - Step 12
Tighten the oxygen sensor fastener. Use a 22-mm oxygen sensor socket. Use a torque wrench. Tighten it to 37 Nm torque.
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