When to replace the Lambda Sensor on your AUDI A8
Recommended replacement interval for the part category Lambda sensor : 100000 km
Important!
This replacement procedure can be used for:
AUDI A8 (4H2, 4H8, 4HC, 4HL) 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 A8 (4H2, 4H8, 4HC, 4HL) and other AUDI models
Tools
Replacement: lambda sensor – AUDI A8 (4H_). Tools you might need:
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 A8 (4H_). 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 A8 (4H_) – should be done with the engine switched off.
Carry out replacement in the following order:
  1. Step 1
    Open the bonnet.
    Step 2
    Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
    Step 3
    Lift the car using a jack or place it over an inspection pit.
    Step 4
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    Unscrew the fasteners of the oxygen sensor housing cover. Use a drive socket #10. Use a ratchet wrench.
  2. Step 5
    How to replace AUDI A8 (4H2, 4H8, 4HC, 4HL) 4.2 TDI quattro 2010 Lambda Sensor - step-by-step manuals and video guides
    Remove the oxygen sensor housing cover.
  3. Step 6
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    Detach the oxygen sensor connector.
  4. Step 7
    Changing Lambda Sensor on AUDI A8 (4H2, 4H8, 4HC, 4HL) 4.2 FSI quattro 2012 by yourself
    Unscrew the oxygen sensor fastener. Use a 22-mm oxygen sensor socket. Use a ratchet wrench.
  5. Step 8
    How to remove AUDI A8 6.3 W12 quattro 2013 Lambda Sensor - online easy-to-follow instructions
    Remove the oxygen sensor.
  6. Step 9
    How to replace Lambda Sensor on AUDI A8 (4H2, 4H8, 4HC, 4HL) 2014: download PDF manuals and video instructions
    Cut the thread for the new oxygen sensor. Use a thread tap. Use a ratchet wrench.
  7. Step 10
    Treat the oxygen sensor. Use high-temperature ceramic grease.
    Step 11
    How hard is it to do yourself: Lambda Sensor replacement on Audi A8 D4 4.2 TDI quattro 2015 - download illustrated guide
    Install the new oxygen sensor.
  8. Step 12
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    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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DIY AUDI A8 (4H2, 4H8, 4HC, 4HL) Lambda Sensor replacement - online guide
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